Th350 or TH400 help *please*

[Tank]

So My shop has ran into a snag with my TH350 and we need a specialist good with auto trannies to help us out so if anyone knows any good places to call or what not id greatly appreciate it if not then my supra may be in the shop yet another god damn week..............heres the problem

Transmission: TH350

Problem: the transmission will go into, park, neutral, reverse, and first gear. when you put it into 2nd gear it acts like its in 1st gear, and when you put it in 3rd it acts as if its in 1st gear also. now according to My shop when they put it on the lift you could clearly see where the tranny was engaging the proper gears however they when it goes on ground it just winds out first and acts like its in 1stfor second and third.


Now the transimission is brand spanking new "well since rebuild never was used" so any input or thoughts on what could be hte problem or places where i can find more info out would be greatly appreciated cause id like to get my baby back asap. here are some pics of the underside of my supra showing the tranny hooked up. Id like to also say a Big thanks to Topspeed for all the great work they have done for me this is the last problem and my baby is done.





Sorry the pics are so big but id like for you to be able to see every aspect of it


thanks in advance

[Krazykouki]

ya know....there is a really good transmission shop right beside tophat...not exactly to sure what the name of it is tho...PM sent

[Tank]

ill try them man thanks

[Reaper]

Chris Eichman
Import Performance Group
www.importperformancegroup.com
678-613-3746
they work on
BMW
honda
mini
vw
lexus
infinity
audi
nissan
mazda
toyota
acura
mercades


Chris is awsome! He should be able to help you out!

[Tank]

thanks bro gave him a call also no dice but a very good guy, i also have called half of atl tranny shops and there at a lose or dont know jack about th350's

[TIGERJC]

talk to some hot rod shops in n.c. and muscle car shops are your best bet, or aap

[Tank]

Ill try AAP i dont know any hot rod shops thanks JC i apprecaite it if anyone knows of any domestic shops or hotrod shops please pot numbers or links thanks

[TIGERJC]

Ill hit up my old school mechanic and see who he knows.
so you need it rebuilt, and post this on supraforums.com

[Tank]

you mean from fay co. high i went to his class i cant remember his name but he had a purple old school hot rod maybe ill go see him tommorrow thanks JC and i post on supraforums and clubna-t.com also

[Vteckidd]

if i can drag dave away im sure he knows

[TIGERJC]

naw my other mechanic I sometimes go to. Try wild willies - 770-922-9493

[Tank]

hey thanks mike i apprecaite it and dont forget about our appointment next friday bro and JC ill call them tommorrow man thanks

[Vteckidd]

dave said check the D10 cable, rev it up an see if itll go into a next gear.

also, does it free spool?

[Tank]

im not sure clark is the one working on my supra hes done a great job he said he drove it and it winded up first gear but never shifted i have a high torque on the converter so daveH said it should feel like one gear but you know when it shifts ill hear from clark shortly hes suppose to call me ill let you know and thanks mike


just asked daveH he said:


dave turbo henry (2:36:26 PM): there is no cable
dave turbo henry (2:36:31 PM): it's a manual valve body

[The BUCKY]

good luck with that

[Tank]

thanks man im trying to help out and alteast get some answers so she can hit the streets this is our last obstrusction we have to clear so im keeping hte faith :goodjob:

[Tank]

heres some pics with the pan droppped

[SLow_POke]

is that a TCI trans? or just pan?

anyway when i had a problem on my old hot rod i called TCI, and Summit racing( since i got it from them) and they helped me diagnos my TCI trans. worth a try



-Ernie



EDITED****

you did rebuilding it and never testing it till now .
could it be the bands not having proper pressure applied , under load?
problem witht he valve body ?MLP? LoL im just throwing ideas

[Tank]

yep its a TCI th350 from my understanding i think i will give summit racing a call to try and get some clarity to the issue cause ive gotten no where so far

[SLow_POke]

yep its a TCI th350 from my understanding i think i will give summit racing a call to try and get some clarity to the issue cause ive gotten no where so far

hope you fix it .

im trying to get my old instructor to help out but he wont answer email till later tonight . hes a master tech , specialist in AT.. but teaching class right now hopw i get him to answer the email :goodjob: .

[Tank]

hope you fix it .

im trying to get my old instructor to help out but he wont answer email till later tonight . hes a master tech , specialist in AT.. but teaching class right now hopw i get him to answer the email :goodjob: .
hey i appreciate it man i felt there was some good knowledge or people with connects to get some info on this so i deccided to post up man i really appreciate it hit me anytime tonight ill be online :goodjob:

[Reaper]

Just got off the phone with my uncle, he knows the owner of some Hot Rod Shop in Forest Park..he's gonna call me back in a few minutes..

[Tank]

kool thanks man im in the garage still stripping the engine bay so call the house phone bro later

[SLow_POke]

hey i appreciate it man i felt there was some good knowledge or people with connects to get some info on this so i deccided to post up man i really appreciate it hit me anytime tonight ill be online :goodjob: NP man . anything to try and help .

he emailed me back wont be out of teaching class till 12:30 cali time!! so that make it 3:30 our time :eek: so i wont get a straight answer till then , and sleeping .:(

hes pulling my leg and making me think(sayibg i should be able to trouble sh0ot it:blah: ) lol

anyway the only thing i can briefly think of is the valve body, throtle v cable , and or governor problems. . i only tested 3 out which im no expert but prussure testing at a AT shop is the only bet (unless you know how to pressure test it yourself.

i would strongly lean at teh governor since it controls MLP(main line pressure).

-Ernie

[luthi]

possible valve body issue. if the trans has set up for any amount of time in a dry (with out fluid) condition one of the valves, balls ect could have frozen in place. you can try to disassemble the valve body with the unit in the car, clean it and reassemble. just be VERY careful. if not some of the small balls can become lost. also be sure to replace them in the same spot making sure they move smoothly.

[SLow_POke]

possible valve body issue. if the trans has set up for any amount of time in a dry (with out fluid) condition one of the valves, balls ect could have frozen in place. you can try to disassemble the valve body with the unit in the car, clean it and reassemble. just be VERY careful. if not some of the small balls can become lost. also be sure to replace them in the same spot making sure they move smoothly.


VERY true. specially since the tolerances are extremely tight

[Tank]

good info thanks il foward it to topspeed thanks

[Goldollar]

Most likely its not a problem with any of the checkballs in the valve body, the pressure that an auto trany makes would move the check balls of the seats, it defenitly sounds like a problem with the modulator valve aka:throotle valve. You have all your gears you just cant up shift wich is what the modulator does. Is it a full manual auto or auto with a manual valve? I would check at the modulator ,if you have one, make sure he vacume line is hooked up/hooked up to the right vacume source, also check that you dont have a restriction in the line. if there is no problem with that make sure you have proper mainline pressure. i have a manual that help trouble shoots gm auto trany but i gotta find it, but check the modulator and give me a call after that.

[Tank]

Most likely its not a problem with any of the checkballs in the valve body, the pressure that an auto trany makes would move the check balls of the seats, it defenitly sounds like a problem with the modulator valve aka:throotle valve. You have all your gears you just cant up shift wich is what the modulator does. Is it a full manual auto or auto with a manual valve? I would check at the modulator ,if you have one, make sure he vacume line is hooked up/hooked up to the right vacume source, also check that you dont have a restriction in the line. if there is no problem with that make sure you have proper mainline pressure. i have a manual that help trouble shoots gm auto trany but i gotta find it, but check the modulator and give me a call after that.
thanks man i appreciate it im going up to topspeed today so ill know more first hand once i get there 'well with the limited mechanical knowledge i have anyway" but from what daveH said its a manual valve tranny, no vacuum lines and i think he said no module but ill double check that/ ill call you once i reach topspeed today hopefully its something small and we figure it out today if not another week without the dog hitting the streets :doh:

[SLow_POke]

thanks man i appreciate it im going up to topspeed today so ill know more first hand once i get there 'well with the limited mechanical knowledge i have anyway" but from what daveH said its a manual valve tranny, no vacuum lines and i think he said no module but ill double check that/ ill call you once i reach topspeed today hopefully its something small and we figure it out today if not another week without the dog hitting the streets :doh:


any feedback ?



-Ernie