shaggy56

Who here has abused your 700r4 at the track and is still holding strong? I realize they need better internals and my buddy has been running a built one in his supercharged 80 malibu for about 3 years with no problems. Just wondering how much power guys have put behind them and how long they have lasted them.

Floor guy

My trans has run high 10 second et's behind a 383 and a 150 shot.
Typical et without spray is 12.10 with a 1.620 typical 60 foot time.
Best 60 foot time is 1.505. 700r4's are better than they are given credit for. If built right, they work well.

shaggy56

Sounds great. I can get a great deal on a newly rebuilt 700r4 with a shift kit out of a 92 firebird. I heard that the newer years was the better of the 700r4. I know the sunshell is the main weakpoint but how would the rest of the internals pan out. Do you think I would need to worry about the planetaries and sprag from this year? Do you think it would hold up if I dont run any nitrous with 400hp and torque?

Floor guy

You "should" be fine. 92 was a good year. If the trans was professionally built, it should have a new 29 element sprag. If the builder has been around the block, he was wise and installed a h/d aftermarket reaction shell. I have yet to see a 400 hp car break a 29 element sprag, or a 4 pinion gm planetary. My own car wore a rear planetary out at approx 235,000 miles.

Pro Built Automatics

The few 9 second transmissions I have out there all use the GM 29 elememt sprag, and the 4 pinion planetaries, and they never break any of this.

shaggy56

I picked up the 700r4 tonite. Its been sitting so its a little dirty but it did get fresh rebuild right after it was pulled. I paid $100

So far I see it seems to be the better version because it has the rainbow casting mark. Also I want to run a cable speedo but it looks to have an electronic speedo connection.

The markings I got from it says 8676358 and the pad has 1FTM172H. Still trying to Id what year it is but from the look I can tell its newer than 89. Any advice anyone has to offer would be great. I think it might be a 1991 model.

Floor guy

It is a 91 model.

Shagwell

Dans87GTA is running my original 700r4. It was rebuilt by a buddy of mine and lasted him a year or two before he hurt the rear planetary, mostly caused by violent shift firmness. - I since built it myself and he hits the track on Mickey Dr's whenever he gets the chance, still doing good after a year. - daily(only) driver

beast reaction shell
5 pinion rear planet
billet intermediate servo
superior shift correction kit
raybestos(mostly) clutches w/ thick 3-4 steels(clutch packs wear mix-in-match from stuff I had)

I've got one running well in a 4wd tahoe with 35" tires and a built 355 TPI vortec for over 2 years now. Another with just about every internal upgrade available behind a 454 with a 871 blower in a 81 pick-up with a tq arm suspension and 29x18.5 hoosiers that hangs the front in the breezy everytime its driven.