C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

shift kit install unsuccessfull.

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Old Feb 2, 2005 | 04:37 PM
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Default shift kit install unsuccessfull.

Shift kit installation gone bad. Whats the problem? Everything seemed alright. This is my second time out since shift kits been installed. Tried backing out of my driveway and its like reverse acts like park now. When i go forward I have to give it more gas to get the car to move. Almost like the car isnt fully engaged. What do guys think? Mechanic error or what. What do you think he did wrong? I checked the fluid and there was plenty. It ran good for about 10 miles.
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Old Feb 2, 2005 | 04:57 PM
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I just got off the phone with the mechanic who installed this transgo kit. Guy is talking to me like this has nothing to do with his install. He says it drove fine when you left the shop and took it for a test drive. I said I only put 10 miles on this thing and it worked fine before the install. Then he tried to blame this on my car being older having a higher stall speed 3000, says these things happen
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Old Feb 2, 2005 | 05:04 PM
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Originally Posted by bobmic93
I just got off the phone with the mechanic who installed this transgo kit. Guy is talking to me like this has nothing to do with his install. He says it drove fine when you left the shop and took it for a test drive. I said I only put 10 miles on this thing and it worked fine before the install. Then he tried to blame this on my car being older having a higher stall speed 3000, says these things happen
Ask your mechanic if he wants a broom to clean up that mess (his I dunno theory). Hope I'm not rushing to judgement here.
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Old Feb 2, 2005 | 05:12 PM
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Well, the best you can do is check fluid when warm and set the TV cable.

Sounds like you need to take it to a reputable tranny shop. If you can't get a referal from this Fourm try asking around at the local track.
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Old Feb 2, 2005 | 05:20 PM
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strange that it would work fine for about 10 miles and then crap out like that. i can't think of anything internally that would let go and cause this type of problem. i'm not very familiar with automatics, but did you check the linkage at the trans? sounds like something came loose and you're not getting into gear properly?

what happens when you drop it in L1?
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Old Feb 2, 2005 | 05:43 PM
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Alright. Did your mechanic follow the special Accelerator/T.V. cable adjustment procedure? You have ASR and you can't simply try and adjust the cables half-butt.

You're going to notice some "slippage" with a 3000 stall converter. How much gas to you have to give it before you actually start moving?

Do you have any leaks? You need to physically go under the car and check.

Are you absolutely sure you have the proper fluid level in the trans? If you're low at all, the tranny won't have enough line pressure and it will act very strange.

Did your mechanic install a tranny cooler or did you get one installed with the higher stall converter?

Last edited by cprgmr; Feb 2, 2005 at 06:03 PM.
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Old Feb 2, 2005 | 06:40 PM
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When the boost valve is re-installed, its possible to install the circlip in the first groove, which will result in symptoms like yours. It needs to go in further, into the 2nd groove. Its an easy mistake to make and is worth checking...
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Old Feb 2, 2005 | 11:23 PM
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Originally Posted by ben73
When the boost valve is re-installed, its possible to install the circlip in the first groove, which will result in symptoms like yours. It needs to go in further, into the 2nd groove. Its an easy mistake to make and is worth checking...
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Old Feb 2, 2005 | 11:23 PM
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Hes now trying to tell me that the increased line pressure caused a certain part in the front of the tranny to go bad. He called a tranny specialist across the street and this is what there telling him. Im looking at a couple hundred bucks to up grade the part to handle the increased line pressure. I dont know. I Know nada about trannys and I do have a tranny cooler with the 3200 stall thats been in for over a year know. Ill have to question this guy a little deeper. Do you guys think its possible that he could be right. If my tranny broke down even if he installed properly should he be responsible for paying to fix it up?
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Old Feb 2, 2005 | 11:43 PM
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Default I had exact same problem

it was the 700r4 trans in my Suburban. It was a factory rebuilt unit. I picked it up and had a shop install it. It drove home just fine. Then later when I drove it, it started out in second, and reverse became park. It acted jumpy around 30-40 mph. I called around and the consensus was this: Put in a quart of trans-x (pump out some fluid first) and adjust the throttle valve cable. Then if it still doesn't work, try this: with the car idling in park or neutral, pull the exposed portion of the TV cable sideways and let it snap back. Do it about ten times. That may free up some particles of gunk stuck in there. Maybe you try the snap back routine first before you start with the pump out and trans-x. Maybe it will work with just that much tinkering.
It worked for me. The trans hasn't had a bad day since.
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Old Feb 2, 2005 | 11:57 PM
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This is great input guys. Im going to run this by him tomarro. Anyone elses input is appreciated. Ill keep you posted.
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Old Feb 3, 2005 | 12:40 AM
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Did your a/t mechanic only install the new shift kit springs in the valve body, or did he completely go through the clutch packs and check tolerances ? Worn friction linings will cause slippage as well as worn veins in the trans pump, valves sticking (friction lining) clogging up the valve body... I can copy the auto trans section in my 85 GM service manual and snail mail it to you.
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Old Feb 3, 2005 | 12:50 AM
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Originally Posted by bobmic93
This is great input guys. Im going to run this by him tomarro. Anyone elses input is appreciated. Ill keep you posted.

Transgo has a help line that you can call. These guys are the true experts, tell them your symptoms and go from there. Also if it worked for 10 miles it should have continued to work. I installed one of their kits into my 2002 Suburban with a 4L80E, it worked for about 12 miles and after that I tried reverses and didn't have it If I shut the engine off and tried it the reverse came back.

I called transgo and they advised me that the I may have damaged the valve body gasket or over torqued it or the low and reverse servo seal may have been damaged during the install as that piston had to come out in order to install one of there springs. I pulled it apart and bingo there was a minute tear in it. Once the seal was replaced and I CAREFULLY retorqued the valve body, the tranny has been A OK every since.
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