d1scamaro

ok im finally ready to put this motor in the car but i need to know what trannys people are using. ive heard of people running the t400, but i dont want to have to "lie" to the ecm and say it has a locking converter, plus i would like OD since i plan on actually driving the car. i have looked and it seems there isnt a great aftermarket world for built 4l80's. my motor is a iron 408 callies crank/rods, diamond pistons, and ported lq4 heads, and 92/92 so with 15ish psi i expect around 750rwhp, so what will be the best choice?

also can i use autometer's 3675 a/f guage it says will work with factory narrow band systems. or will i need one that will work with a "wideband"? i dont completly understand the difference between narrow and wide band.

355TurboLT1

iTrader: (11)

Built 4L80. If you want the best call carl Rossler. There is plenty of support for the 80. If you plan to drive the car on the interstate f having a th400.

THE F-BODY KING

iTrader: (10)

I'm running a very similar setup, and I'm running a Level 7 4l65E from Finish Line Transmission. FLT is awesome, look em' up they can help you out man.

DeltaT

iTrader: (5)

Built 4L80E. With cubes and FI, I would stay away from the 4L6xE line completely. "Overbuild and understress" as the Germans say.

My Hughes-built 80E has performed flawlessly for 5 years at the 8xxhp level, and I don't feel the need to touch it as I move up to the 1000hp zone.

Jim

2001WS6Vert

4L80e for sure at that power level. I've got a pile of built 4L6xe's that were built by the best folks, there is a limit no matter how good you are.

98SuperchargedLs1

iTrader: (1)

i have a built 4l80e thats going behind a ls2 turbo in my 65 chevelle and im only looking to be at 500-600rwhp.. i had a 4l60e but sold it for my 4l80e and then had the tranny fully built

hellbents10

iTrader: (10)

80e and never look back lol.

BLNLS1/RX7

iTrader: (2)

With my 408cu.in. and D1 I chose a built powerglide with a trans brake and a 4500 stall.My build puts down 713RWHP.

d1scamaro

I don't want to use a powerglide cause I want to drive it on the street. So the 80e seems to be the best choice. Anyone know about that guage?

fatmat80

what about a t400 and a gear vender overdrive ?

DeltaT

iTrader: (5)

By the time you get both the built TH400 and the <expensive> GV OD units, you are pretty much at the level of a built 80E, and you DON'T have the programmability that the 80E offers, which is really nice. I have mine set up so the TPS under 49% drives like Grandma's Buick, and after 50% it ramps quickly up into KILL mode, full-on neck snapping shifts.

Jim

Bob@BruteSpeed

iTrader: (16)

I agree, the 4L80E is the way to go if you need the overdrive. Bob

d1scamaro

Sweet thanks guys I think I'll go with the 80e probly from Hughes or flt whatever is cheaper apple for apple

T/A KID

iTrader: (12)

Delta of anyone else, do you have a good tranny tune that maybe I could look at? I just have the one that came in my TCI box to control my tranny