Game ova

Couple weeks ago I had rear end yoke let go during a hard launch at the track, so I'm going to take a look at the transmission here soon. While I'm in it, going to go ahead and do a 4 clutch intermediate as I think I'm exceeding it's holding capacity. Now, as far as the input/forward drum....on a car that makes 745/1045, would I high end billet setup be like putting wheelie bars on a prius...as in completely unnecessary? I guess one could say just do it since you're already in the transmission, but they piece I'm looking at is over $600....not exactly cheap. Basically, I don't want to be buying high end pieces if the stocker is more than adequate.

clinebarger

I would upgrade, But not with a $600 dollar shaft & drum, Eliminating the under cut's in the shaft alone does quite a bit in the strength department. I think this would be a good match for what your doing at half the price......http://www.ckperformance.com/View/CO...SHAFT-AND-DRUM

Game ova

I went and looked, nice piece. Question though, being that the input shaft is larger than oem...will it still work with a standard converter?

clinebarger

It is only oversized at the Forward drum, It's a drop in replacement for a stock Shaft & Drum,

Game ova

Silly me, not sure why I thought the converter side of the shaft would be bigger too. As you can tell, I'm still a rookie.

tittan1500

iTrader: (8)

For your power level the stock hard parts are going to be fine.

If the car leaves super hard and is heavy, ya the input and forward hub could be replaced.
but lots of guys run bottom 9s with the stock parts in f bodies. or faster if the cars light

Game ova

It definitely leaves hard and is heavy. I think I'm going to do the input shaft/forward drum.....but stay with the stock intermediate shaft. Having Already done the 4L80 direct, and after this forward drum upgrade (barring anymore driveline failures) I hope to run this transmission for many years to come.

SLOW SEDAN

iTrader: (13)

I managed to break a TH400 NA... so power alone isn't always the defining factor.

After breaking a stock unit I waited for FTI's black Friday sale and got their Level 4.5 for a good deal and never had another issue despite doubling the horsepower. Their build consists of the following rated to 1100HP:

-Race prepped factory Chevy case
-FTI Billet aluminum transbrake valvebody
-Reverse shift pattern
-Billet aluminum drum
-34 element sprague
-300M Material input shaft
-BIllet forward clutch hub
-Race material clutches
-Deep aluminum pan

FTICONVERTERS

iTrader: (3)

Nice! That 300M input shaft(1100HP rated) is also oversized at the drum as you guys mentioned above.

Here's a link to that input drum with the option to upgrade to our ERMET input shaft and drum that's rated to 2000HP!

http://ftiperformance.com/TH400-Inpu...?categoryId=-1

Game ova

Just curious, but is your rating based on crank horsepower? Not that I'm anywhere near that though, just wondering about the method used.

BOLO

iTrader: (40)

FWIW, you should check out ProformanceRacingTransmission. They make 400 that will handle abuse, even with their Stage 1. I'm waiting for mine that their conveniently 30 minutes from me in Woodstock, Illinois.

Game ova

Thanks man, But I build my own transmissions.

FTICONVERTERS

iTrader: (3)

Yessir, all of our ratings are at the crank!