BOLO

iTrader: (40)

Hey guys I'm pretty sure this has been debated thousands of times, but this is where I'm at, at the moment. I'm debating whether I should go ahead and swap to a TH400 rmvb with a brake or upgrade my 4L60E to FLT's top dog Level 7. Your suggestions and/or recommendation is greatly appreciated, thanks. I have to run and see what this new build combo is capable of running!

ragtopz28

iTrader: (57)

I'd run the FLT...robs less hp, weighs less, and more plug and play. And the computer "should" shift more consistent than RMVB if you bracket race it. BTW my FLT level VI has been flawless and bullet proof.
How much HP your expecting?

nj02z

iTrader: (6)

Switch. Your converter choices will be endless. I run a TH350 rmvb and it is very consistent.Plus a Th? will have a better first gear. The 3.06 4l60e first gear might give you traction problems on a marginal track.

BOLO

iTrader: (40)

Yes, very good point there. I'm curious how much hp the Th400 would suck up.
During initial tuning, the combo made 600 peak rwhp at 7300-7500 rpm on a mustang dyno, through an unlock 8"5500 stall. Will the computer be able to command shifts at those RPMS? I know with a manual Th400 you can shift to those RPMS and beyond.
How much power are you running through your FLT Level 6, and at what RPMS?

ragtopz28

iTrader: (57)

nj02z brings up some good points. A TH especially with an air-shifter can be very consistent. At that power level, he also has a good point on the first gear. But you'll have to buy a new trans member, shifter and drive shaft. I just went through the same dilemma on my 98 in sig and went with the 4L60 just for the convenience. It's a Performabuilt Level II
FLT is in my 02...540hp and shifting @ 6,700 (that's on the juice and spraying through the shifts)

BOLO

iTrader: (40)

The question I should also ask is, which trans will be more efficient and faster at the drag strip?

BOLO

iTrader: (40)

I thought you have an FLT Level VI?
Oh ok, you have it on your 2002 Z28.

nj02z

iTrader: (6)

th350

Z28SteveA4

iTrader: (16)

Here's a serious question you you bolo do you street drive your car a lot? Do you drive on the highway with the car for long periods of time? Do you car about not having overdrive?? If you don't care about loosing overdrive then a turbo 400 or turbo 350 is the better way to go for drag racing.

Nostang

iTrader: (4)

Go Th400. It will be more reliable/stronger for a track car. Less first gear and torque multiplication. Get a nice 8" converter with a transbrake th400 and let it eat. Also, th400 refreshes are a breeze. Who cares how much rwhp it sucks up on the dyno when the real goal is ET reduction. My th400 is dead on consistent even while I was tuning the car and experimenting with shift points (still ET/mph very close even though I was making drastic changes).

FWIW, my old 355 nitrous combo dynode 535rhwp through the th400 and went 10.2@133-134mph at 3650lbs. Your car should go mid 9's N/A with the right converter.

BOLO

iTrader: (40)

Considering the 350 as well.

Only drive it to local car show. No hwy driving at all.

More and more I might just go this direction.

ragtopz28

iTrader: (57)

TH350 sometimes get a bad rap, but can be built very strong. I had a Rossler TH350 in my old drag car and it saw hundreds of 5,500 Transbrake launches with zero issues. I would do a 350 over a 400 for your application (if you don't mind the extra expense of the swap I mentioned earlier).

sillysspeed

iTrader: (21)

If you really want to get into efficient 3spd Trans look into proflite Trans or a th200. Both of those will pick up et over the other transmissions being mentioned. Both very lightweight and super efficient with the goods inside.

My budget wouldn't allow for a proflite so I stuck with the 4l60e. I got the lower 1st and 2nd gear planetary ratios to help with traction and with the gear drop offs in the 4l60e.

Good thing with sticking with the 4l is you can keep stock shifter,Trans mount, driveshaft etc. cons are weight and cost to build

blk00ss

iTrader: (66)

How much do you weigh?

JL ws-6

iTrader: (50)

Th400 all day long and be done. Sfi case if you can afford it up front and you'll be goood

nj02z

iTrader: (6)

Bingo. Call Coan and get there recomendation. See what they are putting in the COPO.

Launch

This. The consistent and fast shift speeds of the fmvb T400 always offset the slight less weight benefit of the t350.

TTur1996

Cars always get more HP eventually. No question about it, TH400 for sure. Endless things you can do to them, to make them more efficient, and way more light. Not to mention, they are damn near indestructible. Call Carl Rossler. you will be so happy you did.

conexion914

iTrader: (5)

TH400 or a glide depending on weight.

SteenH

Another th400 bump.
As stated, options are basically unlimited when it comes to a 400. And rebuilds are peanuts compared to a 4 speed. Do it and never worry about it again!!!