Lady Redhawk

iTrader: (6)

What is the max HP people are seeing with the stock tranny? I have 405rwhp, 395 rwtq and want to add a 100 TNT shot to it. At the track I will wait to engage after the 60' going about 35 mph. Can my stock tranny take it?

Joel_SS

iTrader: (8)

Its days will be numbered.. And depending on its currrent condition it may not make for 1 run..

Ouija

iTrader: (3)

If it takes it, it probably won't be for long!

GM rated these things as handling 350- maybe 400HP tops.

monicaz28

iTrader: (5)

I agree, I went through a couple before I got one "built right" with just around 400 hp... It doesn't seem they can take any abuse without the top 2 gears going out on me.

blkZ28spt

When mine lost a clutch pack I had, get this....343 rwhp and 55,000 miles.

1BAD98LS1

iTrader: (33)

I'll give your tranny about 10 or less passes and then she will lose some of the gears, especially with the N2O.

BubaGumpShrimp

iTrader: (1)

always heard 450 is the max a stocker can take. Some will go out much sooner and lower power like other people have posted..

Z28_Ninja

iTrader: (2)

all depends, mine has 94,000 miles on it and i put a cam in at 91,000 that brought it up 360rwhp and 355rwtq and right now it is have the tranny built because as soon as i put the cam in it started to slip and hit the rev limiter in first, then 4th started to slip also.

Shane_G

iTrader: (6)

Who builds a 4l60 to handle 800 - 900 rwhp?

Lady Redhawk

iTrader: (6)

I have 100s of trips down the track, cutting anywhere from 1.6s to 1,8s 60' with no problem with my tranny. I never try to manually shift it. When you do that, it doesn't allow enough line pressure to build to make the upshift when you try to go to a higher gear. That is why there is a delay when you manually up shift. This is NOT good on the tranny. Also I have a good tune with my 4000 stall converter and have a little more line pressure to help keep it from slipping. All of this on with 405 rwhp and 395 rwtq.

My tranny went boom when I tried to hit it off the line with a TNT 100 shot. I am guessing it had close to 600 ft-lb of torque when it happen. I believe the main thing that caused it was severe wheel hop. It is now rebuilt with a few upgraded parts, but still not a completely beefed up tranny.

We have added QA1 shocks and relocation bracket for the LCA to help eliminate wheel hop.

I would still like to see what it would do on the track with a 100 shot, but I will NOT try to hit it off the line again. Since I NEVER had a problem before I tried the nitrous on the line, I am thinking, if I wait until after the 60' mark before I "hit" the button. and not spray during the shift using the MSN window switch, what are my chances for this to hold up?

Z28_Ninja

iTrader: (2)

horsepower does not matter to a tranny as much as RWTQ. the guy that i went to has a car that i know of that is running a 150 shot and hits 700 RWTQ and hes has been running the tranny for about a year and has not hit the rev limiter once. but if you are going to run 800-900 then i would advise to go with a built 200r-4 tranny.