rebuild tranny now no boost

ty736

New member
got my truck back today and I go to launch it I cant get it to build boost, then at full throttle I only build 11psi I was running about 17psi before the rebuild
 

gmcturbo

Active member
Re: rebuild tranny now no boost

make sure they didnt knock any vac lines off. other than that, the trans "could" be slipping and cause low load causing low boost
 

MAITAI1993

DON'T MAKE ME SLAP YOU.
Re: rebuild tranny now no boost

Someone knocked a vac line off... prob. at the wastegate accuator..... takes about 11 psi to open it hooked stright to the turbo... :2cents:
 

ty736

New member
Re: rebuild tranny now no boost

it is also not stifting until the rpms are geting into red line
 

ty736

New member
Re: rebuild tranny now no boost

dons transmission a local tranny shop known around the area for chevy trannys, vetts camoros etc. could it possably have the wrong stall speed converter or governor?
 

SY2932

Administrator
Re: rebuild tranny now no boost

Check your TV cable. If it is out of adjustment, you will burn that transmission up. If the trans shop did the install they *should* have adjusted it and road tested it :roll:.
 

Tooky

Serious about performance
Re: rebuild tranny now no boost

ty736 said:
dons transmission a local tranny shop known around the area for chevy trannys, vetts camoros etc. could it possably have the wrong stall speed converter or governor?
Yes, absolutely both are strong possibilities. I pray that you got your stock SyTy valve body still in this rebuild. Did you find anything further out yet? Or are you still looking for ideas? I hope you can get it resolved; my truck has been down for over 1 year due to very similar circumstances. :roll: :tdown:
 

ty736

New member
Re: rebuild tranny now no boost

got it back everything seems to bo ok except when it goes to shif into 3rd it wants to hang up till like 6000 rpm then i let off and it will shift i dont know if this is a tv problem or a valve body issue?
 

jwaller

Evil Genius/SyTy Guru
Re: rebuild tranny now no boost

could be both. need to pull the governer check it, get some line pressure readings and the way they are collected and go from there.
 

100in6

100in6
Re: rebuild tranny now no boost

with the motor running give the tv cable a few hard jerks. if it's stuck that should hopefully help. does it shift hard in 3rd gear or not shift at all until 6K? did you put it in? they did right. is the converter in all the way? did they use the stock converter? they should know to do that if they're experienced. the governor is a pretty easy thing to check. pull it and put another one in and see.

just a suggestion. if you paid these guys to rebuild your tran and install it just drive it back there and say "mornin guys. this things not workin. won't build any boost and won't shift out of 3rd gear..." you paid good money for them to do it.... let them do it until it's right. even if they gave you no warranty, they still have to give you a tran that works at the beginning. i wouldn't go messin with it too much on your own. that just gives someone the opportunity to say you did something.

keep us up on what's happening. also, waller seems to be our "resident" tran guy around the board. ask him. john loves people telling him that the trans someone got isn't working. i think he smells future business :) he does build a pretty good trans. these guys should make it right though
 

Tooky

Serious about performance
Re: rebuild tranny now no boost

I agree. It shouldn't hang up to 6000 period. I would take it back and have them look at it ASAP while it is fresh in their minds.
 
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