Turbo 400 Not Shifting Out Into 2nd Gear
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1 2013-11-27 02:46 AM
Topic: TH400 No Shift problem-- valve torso removal?
I've got a TH400 that's not shifting out of beginning even up to about 40 mph. It goes in reverse fine and it goes forward ok. But information technology won't shift when in drive or when I select the gears manually (and I've confirmed the linkage is not the outcome).
Thank you to the interwebz, I've checked the vacuum modulator doohickey and the valve behind it and it seems as if it should work. I've as well removed the governor and checked to make sure the valve moves when I manipulate the weights. So both of the most mutual "try this" fixes I've tried and notwithstanding no shift. (oh, and in terms of "checking" I have no benchmark knowledge so I can just cheque for movement or obvious signs of a broken office). Oh, and speedometer works.
At that place'southward an electric downshift wire that, due to wiring bug (read: Rodent infestation) I'grand not sure if I really want to connect what I'm guessing is the wire that would usually go there. I don't care about automated downshifting based on throttle position so probably all-time to get out off, eh?
Considering it's been sitting for a long time, I'm wondering if there's a valve stuck in the valve trunk. Is this something I can merely driblet the pan, pull the filter and remove the valve body from beneath the vehicle? Or will I lose all sorts of balls, springs, etc? FWIW, I've never seen the inner workings of an automatic manual EVAR. All that I've learned about this thing is from the concluding few days of frantic emails/texts to some tolerant LeMoneers and also the interwebz.
I guess what I'm thinking is if I tin drop the pan, pull the valve body, and manipulate the valves and bank check for debris then reassemble and endeavour again. Tell me if information technology won't be as simple as it was to type that previous sentence. (Will I need new gaskets after doing this?)
2 2013-xi-27 07:twenty AM
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- racinrob
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Re: TH400 No Shift problem-- valve body removal?
Yep, you will need a new gasket. While you are in at that place you might as well replace the filter. You should be able to go a filter and gasket kit adequately cheap.
You should not take parts falling out only from dropping the pan and removing the filter. At present the valve body, I can't say for certain.
I recommend using some agglutinative to attach the new gasket to the pan for installation. Practice not use RTV. Every trans pan that I take heard almost that leaked after installation had RTV used. I tin can't explain why, and others may non have that problem, but that is the feel that I had with 15 years in selling auto parts.
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3 2013-xi-27 xi:09 AM
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- steve
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Re: TH400 No Shift problem-- valve trunk removal?
Not so certain virtually using a gasket sealer to hold the valve trunk gasket crusade that stuff tin can squish out and lock up one or more of the footling passages or valves. I always merely put two of the bolts through the valve torso and laid the gasket on summit the bolted it up to the tranny. Sounds like either a stuck ball or valve or either no vacuum or to the vacuum modulator or a bad modulator.
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4 2013-11-27 06:25 PM
Re: TH400 No Shift problem-- valve body removal?
Sounds like bad modulator. Nearly Th 400 will finally do a forced shift regardless. Even if held in first. But normally at like 5500 RPM. Trans been sitting awhile? Try just getting it good and warm a few times. Don't worry near the kickdown wire. It just changes the iii-2 kickdown speed. Just i wire one right? Non two? Two wire ones have a switch-pitch torque converter.
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and owner of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of awful crapcans.
Earned every terminate with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, two blower explosions, and a never-ending thirst for more fuel. Finished em all! Currently hiding in a secret base in the shadow of the "Race to the Clouds".
5 2013-xi-27 08:06 PM
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- Parkwod60
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Re: TH400 No Shift problem-- valve torso removal?
Also but running the motor and pumping fluid thru the tranny may loosen things up and make it piece of work again, if it is stuck. And so there are all sorts of additives that are for exactly that usage. I had a cast iron powerglide that hardly shifted when I first got the car running, only information technology worked just fine after a few days of running information technology and driving slowly effectually, plus draining the oil fluid and refilling.
Here's a pull a fast one on to keep the gasket in place without RTV: Axle grease. put a little grease on the gasket and it will stick to whatever you want. The tranny fluid with dissolve whatever excess grease eventually.
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six 2013-11-27 x:twoscore PM
Re: TH400 No Shift problem-- valve body removal?
The manual guys have some special super viscid compatible-with-ATF grease to do just those sorts of things.. I'd think about grease would do. Except moly disulfide. It might exist likewise slippery. Cause things to slip that shouldn't.
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and owner of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of awful crapcans.
Earned every stop with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, two blower explosions, and a never-ending thirst for more fuel. Finished em all! Currently hiding in a secret base of operations in the shadow of the "Race to the Clouds".
7 2013-11-28 09:48 AM
Re: TH400 No Shift problem-- valve torso removal?
So, basically, a few things will cause a TH400 to not shift from 1st.
1. No vacuum to modulator. This tin be caused past bad vacuum line, grime built up in fitting at motor, Bugs congenital nest in line after information technology was disconnected for awhile...
two. Governor problem. These most normally fail by having the gear strip out. It'southward nylon. Occasionally the valve part of it sticks with a slice of crud. Easy to remove.
3 Kickdown Solenoid. This tin stick open. Rarely.
iv Valvebody problems. Never had to take one apart.
About always the trouble is the vacuum source for the modulator. If the modulator diaphragm goes bad it ordinarily sucks in LOTS of ATF into the motor. The result is usually very obvious.
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and possessor of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of awful crapcans.
Earned every terminate with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, two blower explosions, and a never-ending thirst for more than fuel. Finished em all! Currently hiding in a secret base in the shadow of the "Race to the Clouds".
8 2013-11-29 05:59 PM
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- EriktheAwful
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Re: TH400 No Shift problem-- valve body removal?
Is this a freshly installed transmission? Did you lot prefill the torque converter? Accept you checked the fluid level? I know it's a stupid question, but I always autumn for the stupid mistakes. My recent stupid mistakes: #7 misfire that I couldn't figure out. Existent solution? Had the wrong cylinder diagram. Car wouldn't run above idle. Real solution? Gas pedal unhooked. New tires making lots of dissonance. Real solution? Supercede left rear bicycle begetting.
9 2013-12-01 01:08 AM
Re: TH400 No Shift trouble-- valve torso removal?
Good news is information technology shifts now. Bad news (?) is I'm not sure what the cause was for the no shift. I highly suspect the 12V positive feed that I continued to the trans was holding information technology in the low gear ala "forced downshift".
I pulled the governor one time more, pulled the vacuum modulator, and also permit it idle in "D" for about thirty minutes. Left the wire off the trans, and went for a bulldoze. It really moved and went down the street.
Cheers for all the suggestions, anybody.
10 2013-12-01 10:13 AM
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- Parkwod60
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Re: TH400 No Shift problem-- valve body removal?
Horray!
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xi 2013-12-01 02:23 PM
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- racinrob
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Re: TH400 No Shift problem-- valve body removal?
Skillful to hear.
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12 2013-12-02 09:59 AM
Re: TH400 No Shift problem-- valve body removal?
Alright! Am glad ya got information technology!
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and owner of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of atrocious crapcans.
Earned every end with Blood, Sweat, Tears, Smoked brakes,expressionless wheelbearings, two blower explosions, and a never-ending thirst for more than fuel. Finished em all! Currently hiding in a hugger-mugger base of operations in the shadow of the "Race to the Clouds".
thirteen 2013-12-02 03:06 PM
Re: TH400 No Shift trouble-- valve trunk removal?
SeldomSeen wrote:
So, basically, a few things volition cause a TH400 to not shift from 1st.
1. No vacuum to modulator. This can be acquired past bad vacuum line, crud congenital up in fitting at motor, Bugs built nest in line after it was asunder for awhile...
2. Governor problem. These near normally fail by having the gear strip out. It'due south nylon. Occasionally the valve part of it sticks with a slice of grime. Easy to remove.
3 Kickdown Solenoid. This tin can stick open up. Rarely.
four Valvebody issues. Never had to accept one apart.
Well-nigh always the problem is the vacuum source for the modulator. If the modulator diaphragm goes bad it ordinarily sucks in LOTS of ATF into the motor. The result is usually very obvious.
I'thou happy the original poster got his trouble fixed, only I'1000 going to tag-along on this thread as the auto I'm prepping for Lemons (in the garage on jackstands) has a T400.
I'm confused about statement #ane above: My T400 will shift out of showtime with no vacuum to the modulator, it shifts at the same RPM every bit if I was accelerating at WOT (3500 rpm with kickdown switch disconnected). Is this not working right?
I was planning on running my car with the kickdown solenoid unhooked (to prevent unwanted downshifts - apply the shifter if downshift is desired), and the vacuum modulator disconnected (for highest line force per unit area). I take no experience racing automatic transmissions. I merely wanted to eliminate unintended downshifts mid-corner, whether accelerating or decelerating. Am I doing this right?
thanks,
14 2013-12-02 05:24 PM
Re: TH400 No Shift problem-- valve body removal?
Ah. OK, on item #i. Turbo 400 will practise a 1-2-iii shift with it disconnected. Just as it would at full throttle. This rpm is often MUCH college than you would recall......like 5k or then. The Modulators must be very sensitive to minor amounts of vacuum because they will lower the shift point ~1500 rpm even at WOT over being disconnected. Y'all can run it without But I'd be quite worried about it doing a downshift as yous are braking into a corner and getting the machine loose. It's going to do a downshift at a much college rpm than if it was hooked upwards. With it hooked up properly and throttle closed information technology should not downshift till pretty dull MPH (similar 10 or less). With no vacuum It'll want to downshift similar the throttle was wide open (no vacuum). Probably not good. Leaving the kickdown solenoid unhooked is fine. Never did hook mine upwards. Shift points can be changed by lightening the governor flyweights and past buying a adjustable modulator Currently contemplating building a Switch Pitch TH400 for the Marlin so regearing information technology to 3.08
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and owner of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of awful crapcans.
Earned every finish with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, two blower explosions, and a never-ending thirst for more fuel. Finished em all! Currently hiding in a secret base in the shadow of the "Race to the Clouds".
fifteen 2013-12-02 05:37 PM
Re: TH400 No Shift problem-- valve body removal?
This is me, manually shifting a stock TH400 with a 454. Sometimes I let it shift. Usually I do it. https://world wide web.youtube.com/watch?5=BwFI72SPbY0
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and possessor of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of awful crapcans.
Earned every finish with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, two blower explosions, and a never-ending thirst for more fuel. Finished em all! Currently hiding in a secret base in the shadow of the "Race to the Clouds".
16 2013-12-03 08:twoscore AM
Re: TH400 No Shift problem-- valve body removal?
Nearly of the aftermarket vacuum modulators are adjustable. There is a little screw in the end where the hose attaches. Tune the shift points with that. You can always unhook the vacuum line if it isn't to your liking.
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17 2013-12-04 08:25 AM
Re: TH400 No Shift problem-- valve body removal?
DelinquentRacer wrote:
Most of the aftermarket vacuum modulators are adjustable. At that place is a petty screw in the end where the hose attaches. Melody the shift points with that. You can always unhook the vacuum line if it isn't to your liking.
The above must be clarified to be accurate: The vacuum modulator has virtually no effect on shift RPM when floored (WOT). Those WOT shift points must be adjusted with the governor inside the transmission. The vacuum modulator tin can exist adjusted to move effectually PART-THROTTLE shift points.
Jeremy
18 2013-12-04 08:xl AM
Re: TH400 No Shift problem-- valve body removal?
SeldomSeen wrote:
Ah. OK, on particular #1. Turbo 400 volition do a ane-2-three shift with it disconnected. Merely as it would at full throttle. This rpm is oft MUCH higher than you would call up......like 5k or so. The Modulators must exist very sensitive to small amounts of vacuum considering they will lower the shift point ~1500 rpm even at WOT over beingness asunder. Y'all can run it without But I'd be quite worried most it doing a downshift equally you lot are braking into a corner and getting the car loose. Information technology'south going to do a downshift at a much higher rpm than if it was hooked upwardly. With it hooked up properly and throttle closed information technology should not downshift till pretty slow MPH (similar x or less). With no vacuum It'll want to downshift like the throttle was wide open up (no vacuum). Probably not good. Leaving the kickdown solenoid unhooked is fine. Never did hook mine up. Shift points can be changed by lightening the governor flyweights and by buying a adjustable modulator Currently contemplating edifice a Switch Pitch TH400 for the Marlin then regearing it to 3.08
Got it. I never drove mine around long enough with the vacuum modulator disconnected to realize the difference in downshifting, but good to know. Based on this I will do a picayune more than experimenting, but volition consider leaving it continued.
If I lighten the governor for automatic upshifts at, say 5000rpm (from original of 3500rpm), will the 3-2 kickdown RPM also be influenced (kickdown switch unhooked)? Maybe this question is unclear, let me attempt to enquire it another way: With the kickdown switch disconnected, when the throttle is mashed, does the governor accept any influence on kickdown speed?
I'one thousand trying to effigy out if I simply leave the trans every bit-is and manually shift with the shifter, or re-work the governor for automoatic upshifts at 5000rpm (so I can race in "Drive"), and not worry about the transmission downshifting on its ain during corner exit.
Jeremy
19 2013-12-04 08:51 AM (edited by Team Infinniti 2013-12-04 08:57 AM)
Re: TH400 No Shift problem-- valve trunk removal?
Inappropriate downshifts are easy enough to avoid on the Infiniti, when yous hear(or know) the transition is about to happen waffle the throttle to prevent it from happening,what is more annoying is inappropriate upshifts stealing acceleration torque (we take a no depression end torque revvy motor) if you want to practise something stiffen the shifts a little but do not configure for difficult shifts needed in drag racing.. Saying that claw the downshift wire up to a like shooting fish in a barrel to reach button and worry about fine tuning later a race or 2
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20 2013-12-04 04:23 PM
Re: TH400 No Shift problem-- valve trunk removal?
You should be able to utilize lighter governor flyweights. Then if the modulator is still hooked up it should stay in 3rd gear with throttle airtight ( high vacuum) down to probly 25 mph or less. Information technology won't downshift til you open the throttle. Or you tin can however practise it manually. Of note. A stock TH400 will not shift to first regardless of gear position until you boring downwardly a lot. Like under 15 mph. This never happens at HPR. Changing the governor weights volition likely change that. I however doubt information technology'd matter much. Alter the weights a little bit at a time. Become a spare one and experiment with information technology. Too, elevator the back of the machine upward to ensure the oil stays in when you pry off the governor encompass...
Helm of the Speedholes Wrenching #365 1965 Rambler Marlin and possessor of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of atrocious crapcans.
Earned every finish with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, 2 blower explosions, and a never-catastrophe thirst for more fuel. Finished em all! Currently hiding in a secret base of operations in the shadow of the "Race to the Clouds".
21 2013-12-04 04:29 PM
Re: TH400 No Shift trouble-- valve body removal?
Also on my video every bit I'm leaving the pits at 0:24 you can but barely hear the i-2 shift at light throttle just earlier I get into it to get on the runway. Then It's 2d and 3rd all the way.
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and owner of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of atrocious crapcans.
Earned every finish with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, 2 blower explosions, and a never-ending thirst for more fuel. Finished em all! Currently hiding in a secret base in the shadow of the "Race to the Clouds".
22 2013-12-04 04:42 PM
Re: TH400 No Shift trouble-- valve torso removal?
I accept considered hooking up the downshift solenoid to a button on the shifter to kickdown on command. But, I also find it easy plenty to shift it downwardly a gear, blip the throttle similar you would on a stick, and it works. Just shifting the lever into 2nd doesn't do annihilation. The throttle blip, plus the shifter being in 2nd makes it downshift. Anyhow, old habits die real hard.
Captain of the Speedholes Wrenching #365 1965 Rambler Marlin and owner of the "Cockroach 454 Chevy Bigblock". Collector Emeritus of atrocious crapcans.
Earned every finish with Blood, Sweat, Tears, Smoked brakes,dead wheelbearings, two blower explosions, and a never-ending thirst for more fuel. Finished em all! Currently hiding in a hush-hush base in the shadow of the "Race to the Clouds".
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