I got this off a guys webpage...maybe someone on this board..anyway just wondering if I should do this or get a shift kit...

Corvette TH700R4 Trans-Pack Upgrade

DO NOT go with a shift kit for the 700R4.. it will damage it. These are the "GM" parts you can get to make that tranny a real banger.
8634940 valve
8647351 seal
8639164 spring
8673039 housing
8642079 piston
the line pressure valve that i got [8634940] was a .470 now you can get a .490 or .500 of course the higher the numbers the higher the line pressure and the harder the shifts.... just to let you know.. before i installed this package it would never and not even close, chirp on the 1-2 shift. now its easy to do any time i want to.. i dont know if i told you, but my tranny had a 6cly servo in it.. and thats why i had such soft shifts.. i went with the .470 cause i didnt want to kill myself with the shifts.. you might want to go with the .490 ask the guy when you ask about these part #'s..
should be around $55
get someone to install them, I tried myself, and let me save you the aggravation. I am taking the car tomorrow to have these parts installed.. I have been quoted at $90 for everything including seals and fluid. these are the GM parts for the Corvette Trans.. they will FIRM up your shifts, and raise your shift points.. ***Without*** Damaging your tranny.. I have done a lot of investigating on what is the best for our trans.. and this is the best.. as for the rear.. go with a set of 3.73's go higher if you don't drive too much, maybe 4.10, but if you want reasonable gas mileage go with the 3.73's.
from what I understand there is a coupling in the 700r4 that is weak and some of the shiftkits that are out there cause an enormous amount of strain on that coupling wearing it out and eventually breaking it. and I have heard this from more than one person, but that's not to say that "all" the shift kits are bad for the 700R4 its just better to do what the manufacturer does, and that is replace the servo with a larger one, and raise the line pressure.. this takes a lot of the strain off the coupling and puts it more on the plates..
I just got these pieces installed today, and what I can tell you is that it is awesome to say the least. I have driven in a car with a shift kit and now I have driven in a car with the new servo and pressure regulator, they are surprising two different sensations... the car with the kit just banged into gear at any throttle, but the servo is easy on the low power, and breaks loose in 2nd and chirps 3rd.. it just feels better. and the trans place I took it to install it said I was smart for doing this instead of going with a shiftkit


------------------
1987 Camaro Iroc Z
350 TPI..TH700R

 

BTW:

I got the prices from my local GM Dealer and he said it would come up to $150 Canadian (plus taxes).. so it would be a total of $170.00 (damn government!! hehe)

So is this the real deal here? Is it better than a shift kit? What kind of labour are we talking? I have access to a backyard garage, and I can do most of my own work.. Just wondering if this is best left to the pro's... All comments/opinions appreciated!!

Thanks

------------------
1987 Camaro Iroc Z
350 TPI..TH700R

 

Sounds like good price to me. I am getting a vette servo and .500 boost valve installed for around $60, I paid $20 for the parts.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage, and just replaced a burnt plug wire
"There is nothing more addicting than speed"

 

"these are the GM parts for the Corvette Trans.. they will FIRM up your shifts, and raise your shift points.. ***Without*** Damaging your tranny"

SO if this is so great, why do I rebuild Corvette trannies?

Stick with the TransGo Kit.

 

True true ...I think the Corvette Upgrade may not be worth it.

Ok I have looked at Transgo kit and it looks like it could add some fun to my tranny. So what is involved with this kit? I don't know what this kit does...it says in the add..
" Pro Street or Race w/ "Class ". Holds 1st - 2nd - 3rd to any RPM. Backshifts at your command. Reduces band-clutch failure (stickshift option included). "

What does this mean?? Sorry if I sound dumb . How much work are we talking about to get this kit in?? What's involved?

Thanks..

------------------
1987 Camaro Iroc Z
350 TPI..TH700R

 

I'm not sure of the amount of work that will be involved.
But when it says you can hold 1-3 at any RPM, means that when manually shifting you can shift at whatever rpm you want, I believe in a stock 700r4, the tranny will shift if you let the rpm's get to high.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage, and just replaced a burnt plug wire
"There is nothing more addicting than speed"

 

A stock 700 WILL upshift in the manual low position if RPM's get too high (modified engine). Plus they will not pull back into Manual Low until a certain speed. You have to be carefull with this though since when they say at any speed they mean it! If you are doing 100 MPH and yank the shifter down to Low you are goping to lock the tires up and go into a spin. As to shifts with class, this is not a 'Bang' kit. The shift at light throttle will be short but not too firm but as you add throttle it will get prograssively shorter and therefore firmer. Most importantly is this kit actually fixes problems. It also includes a Hi Rev Spring Kit that requires tranny dissassembly to install. These orevent accidental apply of the 3-4's in 1st or 2nd when at high RPM's (over 5500 RPM). It makes it good to 7200 RPM.