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700r4, transgo,vette servo chirps 35s?

nutt7

nutt7

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I installed a rebuilt tranny with a transgo kit (with plates and all) and a vette servo that shifted too soft. I took it back to them and they fixed it...I hope. Now it shifts very firm on the 1-2. At 3/8 throttle and up it will chirp my 35x12.5 BFG at's...even less throttle while turning. I like it, but want to make sure it's normal before I potentially break something. Otherwise, the shift points are fine and quick. Is my tranny gonna be ok? Thanks!
 
If its the stage 3 kit.. THen yah thats what it should do. My buddy did the same. AWESOME shift 1-2. Gets me everytime :bow:
 
Keep an eye on your u-joints. With a shift like that and 35's on a Suburban they aren't going to last as long. Also upgrade your motor and tranny mounts, they may get damaged or wear out sooner as well.
 
Yes, it will most likely wear on other parts before the tranny. A hard shift in a trans is good imo, because it is not allowing the clutches to slip and wear as much.
 
with that set up you can shift it your self. drive up to where you WANT it to shift and let up on the pedal fast and get back in it to where you were. it'll shift smoothly in that quick let up. I had that setup in my old diesel burb. If you constantly let it hit instead of backing off to shift it it will probably break your planetaries. thats what mine did.

Although I may have been beating it the day it happened:whistle:
 
A lot of these kits give brutal 1-2 without doing something comparable for the other shifts. Granted, this is the one you're most likely to pound on, unless you really are racing, in which case 2-3 is pretty stinking important too. I think it's because giving a 700 a brutal 1-2 shift is very easy, where getting the 2-3 tight is really hard.

Slow, soft shifts are bad for a tranny, but IMO going too harsh is also bad for the hard parts. Unless it's a drag car, there is a happy medium. (And when it is a drag car I sometimes question why build a hammering auto instead of using a manual?) If the shift points are good and the other shifts feel good, you can always pull shims out of the 1-2 accumulator or go back to a softer spring. Some of the "race" shift kits seem to think accumulators are the devil, but they do have a purpose. With the aftermarket plates and holes drilled in the valve body sometimes you almost have to go back to a stock accumulator setup just to keep from shattering your windshield when it grabs 2nd.

If all shifts are hard, you can adjust springs in the pump valve to bring the line pressure down.
 
Just an FYI, I got the transgo stage 2 with no vette servo.

It's a perfect medium. Nice crisp shifts, if I stomp it 1-2 is pretty firm but not a "oh $hit ima blow out my ujoints" kinda thing.
 
Blue85 said:
A lot of these kits give brutal 1-2 without doing something comparable for the other shifts. Granted, this is the one you're most likely to pound on, unless you really are racing, in which case 2-3 is pretty stinking important too. I think it's because giving a 700 a brutal 1-2 shift is very easy, where getting the 2-3 tight is really hard.

Slow, soft shifts are bad for a tranny, but IMO going too harsh is also bad for the hard parts. Unless it's a drag car, there is a happy medium. (And when it is a drag car I sometimes question why build a hammering auto instead of using a manual?) If the shift points are good and the other shifts feel good, you can always pull shims out of the 1-2 accumulator or go back to a softer spring. Some of the "race" shift kits seem to think accumulators are the devil, but they do have a purpose. With the aftermarket plates and holes drilled in the valve body sometimes you almost have to go back to a stock accumulator setup just to keep from shattering your windshield when it grabs 2nd.

If all shifts are hard, you can adjust springs in the pump valve to bring the line pressure down.
Click to expand...

Good advice and good info here, I second the idea of backing down on that firmness some by manipulating the spring rate or shims in the 1-2 accumulator, you are sacrificing long term trans and driveline durability at the altar of the firm shift. A positive shift that is not harsh will be your best bet for trans performance and longevity.
 
Thanks! Lots of good info. I am not too familiar with playing with the innards of the valve body etc. so I have some reading to do. I might swap the vette servo for a stock one too, but not anytime soon. I will keep an eye/ear on my driveline and mounts too.
 
Modding the accumulator is easy. Drain, drop the pan, remove a few bolts then swap springs or shims by hand and re-assemble.

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The shop threw in the kit and servo to sweeten the deal, but they didn't give me any spare parts to swap in. I assume that's what you mean by swap springs and add/remove shims? The kits come with an assortment of choices?
 
take it back tell them much better but just a bit to hard . then you should be perfect.

hard bangs eat tranny cases .

and local cops here years ago when still running caprices got reman trannys with vette servos and had them swaped for next one down and were happy .
 
If you shift it with the gas pedal as I mentioned it doesnt hurt anything due to there being NO load on it when it shifts. it doesnt slip or anything like that. It shifts fast and firm but theres no hard hit due to load load for the split second. Plus it changes gears where YOU want it to. then when you do want to keep your foot in it and get the Hard shift at higher rpms its still there. Thats what most of them bigger firmer shift kits are designed to do.
My tranny guy and me have spent alot of time talking about it. he lives near me and is a chevy buff with a few squares and alot of camaros. He even runs a 700r4 in his 8.5 sec 1/4 mi prostreet camaro. no issues so far:dunno:
 
The first choice would be to talk the shop into making some adjustments for free since they can change the accumulator setup really quick. Or they can probably hand you used parts to try on your own - they probably have boxes full of them. If you research it, different spring rates are painted different colors.

Or somebody on here could send you stock parts in the mail to try.
 
My transgo kit had springs you could swap out just by dropping the pan to adjust 1-2 shift firmness. Should tell you about it in the directions.
 
I am going to ask the shop about it...the other shifts feel awesome. I scooted the back end about half a foot while getting on the on-ramp at half-ish throttle. I also don't like letting off the gas a little to let it up shift.

I don't have the directions or spare parts, so if they won't adjust it for free, I am sure they will hand me some unused parts from other kits.
 
Adjusting it to your liking should be part of the job, they shouldn't charge you for that.
 
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