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Old 03-04-2012, 08:26 PM
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T-350 with reprogrammed VB to full manual now have problems

Hey so i recently converted my stock th350 to a full manual valve body. I got the Huges Performance reprogramming kit that came with all the pieces needed. I went for a ride and first gear seem to work fine, it just took a few seconds to engage but ran fine. It went through all 3 gears without any problems, as i was slowing down i started downshifting 3-2 was perfect, 2-1 the car seem to have jerked back as if i was driving a manual car and went from 5th to 1st kind of like using it as an engine brake. Now everytime i put it 1st its as if i am trying to start with the e-brake on, most cars when you put it in drive they want to start moving, mine is like having it in park. When i give it some gas it starts moving and when i let off its like stopping BUT here is the weird part if i try to start in 2nd it runs perfect as if i was starting in 1st, it tries to roll off at idle and the car seems perfect.

What could could 1st gear to require so much power to get going? tight band? it is not slipping, fluid is at the mark, linkage is properly adjusted.

My only guess would be something with the valve body and 1st gear piston??

Does anyone have any ideas or thoughts?

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Old 03-05-2012, 06:57 AM
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ive been doing some research and i think it might have something to do with the band and engine braking. Please correct me if im wrong but the th350 i beleive has engine braking in 1st gear?? and when i modified the VB it had me add some washer to the servo and piston my guess would be that its too tight. The instructions said to make sure the band moved freely from side to side after everything was installed but im guessing somehow after adding oil and getting it warmed up it got a bit tighter therefore in frist its acting as an engine brake??

I have no need for an engine brake because my compression is way to low to even work, im at 8.5:1 in a 383 stroker, i went with the manual kit so i didnt have to hook up the vacume line (this is what i was told from Hughes Performance) because of the turbo and boost pressure
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Old 03-05-2012, 07:10 AM
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If the band was too tight,it would drag in 2nd and 3rd also gear also....the only time the band is applied is during manual 3-2 downshift.....did you match the gaskets to the seperater plate to make sure no holes were blocked??.....are the top and bottom gaskets installed in the right positions??...just asking..

Last edited by rick 427; 03-05-2012 at 07:17 AM.
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Old 03-05-2012, 08:20 AM
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Quote:
Originally Posted by rick 427
If the band was too tight,it would drag in 2nd and 3rd also gear also....the only time the band is applied is during manual 3-2 downshift.....did you match the gaskets to the seperater plate to make sure no holes were blocked??.....are the top and bottom gaskets installed in the right positions??...just asking..
mmhmm...

As far as the gaskets go i double checked before i put everything together that everything was on right and properly lined up. I will probably end up taking the VB off soon to check it out but i wouldnt know where to start looking.could the 1st gear piston be stuck or have some sort of malfunction?
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Old 03-05-2012, 08:25 AM
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no...nothing in that drum would cause the problem you are experiencing....for some reason,2 things are being applied at the same time,when they shouldn't be, when you go to manual low....I just can't think of the reason why,other than a valve body area malfunction.

Last edited by rick 427; 03-05-2012 at 08:33 AM.
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Old 03-05-2012, 08:35 AM
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Quote:
Originally Posted by rick 427
no...nothing in that drum would cause the problem you are experiencing....for some reason,2 things are being applied at the same time,when they shouldn't be, when you go to manual low....I just can't think of the reason why,other than a valve body area malfunction.
The transmission ran perfectly fine when i took it apart and the only thing i modified was the VB so im gonna have to go over all the stuff i touched and see what i can come up with, do you think it could be a misplaced vb gasket?
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Old 03-05-2012, 08:36 AM
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yes..it very well could be...make sure the upper and lower gaskets are in the right position,and not switched...but it also puzzles me on why it worked the first time.....but if it was my car,i'd take a look at the gaskets first... position, a tear maybe,resulting in a crossleak...etc.

Last edited by rick 427; 03-05-2012 at 09:04 AM.
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Old 03-05-2012, 09:33 AM
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thats what throws me off too, if i take it apart and still have problems i will probably just buy a RMVB and call it a day, i was just trying to do this on the cheap sie LOL
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Old 03-05-2012, 10:08 AM
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Originally Posted by noboostnogo
thats what throws me off too, if i take it apart and still have problems i will probably just buy a RMVB and call it a day, i was just trying to do this on the cheap sie LOL

call Hughes, talk to the tech guy on the t-350 kit you bought
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Old 03-05-2012, 10:33 AM
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Quote:
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call Hughes, talk to the tech guy on the t-350 kit you bought
Ive already emailed them i am just waiting to hear back
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