87silverbullet

iTrader: (11)

The issue here is not too much about the weight. It is about driveability and cruiseability. I like my th350 for the cheap and ease of being rebuilt but I would much rather an overdrive to be able to cruise at 80-85 mph with 3.42 gears in the rear.

HydroStream6

iTrader: (16)

Granted I only have about 3 months of use on my homebuilt 4L80e, but all I did was replaced the hard parts that needed it with new stock parts, the HD ebay rebuild kit, and a Transgo Stage 2 shift kit. So far it's taking my 4200lbs and 650+rwhp with no probs. Gonna push it harder this year.

lmt0705

iTrader: (7)

hey hydro you dont have the black gto that was at new era for a roll cage do you? what did you do for a converter?

HydroStream6

iTrader: (16)

Nope, that's Phil. I have had my car on their dyno though. I have a Yank 3600... might have to change it this year though... it was loose last year and I'm adding a couple hundred horse this year...

eviltwin_1987

iTrader: (18)

i was at 560whp on my stock 4l80e with a transgo hd2 shift kit. Now i will be around 700whp and im not really concerned at all. i paid $500 for a fully working 05' 85,000 mile tranny, $150 for the shift kit, $850 for my py3400 converter, $50 for my dip stick, $65 for a new gm flywheel and spacer, and $10 to convert my harness from 4l60e to 4l80e. thats $1560 w/o a tune

The way i think about it is a truck that weighs 6000lbs pulling a trailer weighing 10000lbs with 320hp uses a stock 4l80e no problem. Your probably around 3600lb with 750hp. So over double the power but 1/4 the weight. just use a stocker with a shift kit and a big cooler and see how far it gets you. if it breaks then upgrade but until then enjoy.

lmt0705

iTrader: (7)

How much stress does a transbrake put on the trans. Whatever I put in I want one

MY99TAWS6

iTrader: (3)

As long as you have good rear end and driveshaft should be fine. Most serious 1/4 mile guys all run transbrakes. I figured since not going to track my car much no point putting one in there but was not overly worried about it breaking things since do have a dana and will have a good driveshaft.

lmt0705

iTrader: (7)

Not worried about my driveshaft or diff. It doesent add any extra stress on the transmission?

lmt0705

iTrader: (7)

anyone know if I can put a transbrake on a stock 4l80 or am I going to grenade it without upgrading the internals?

xXxSilveradoxXx

iTrader: (5)

A trans-brake does add extra stress to the transmission.

I know you can put a transbrake on a 4L80-E. As far as you blowing your transmission up with it, your guess is as good as mine.

355TurboLT1

iTrader: (11)

There are a couple parts that over about 750hp/750ft pounds of torque with hard launching in a nitrous,turbo or supercharged car can and usually do break. The direct drum and sprag and input shaft. The stock intermediate shaft and forward clutch hub seem to sustain about 1000hp/1000ft pounds torque. Its the torque that kills these things.

I am going with a ROSSLER terminator 3 4L80e. He replaced the direct drum w/ a billet aluminum piece and also installs a billet input shaft. I will probablly go with a billet intermediate shaft just in case Also plan to have all of the parts cryo'd.

slow67

iTrader: (2)

The sprag/drum should be good to over 1000 if setup right. The input I have seen break behind stock 6.0s towing (but most should be good to 750hp).

lmt0705

iTrader: (7)

so I will definatly need a hardened or billet imput shaft then?

xXxSilveradoxXx

iTrader: (5)

I've seen some of the high HP/TQ AWD/4X4 trucks have problems with the output shaft.

If I was you I would just run it until it breaks. You know the harder you beat on it the more likely you are to break it so just be cool until you know you can afford to build it. That's how I'm gonna roll. I've got a turbo LQ4 going into my lifted 02 Silverado. All I'm going to do to the transmission is put in a shift kit and a cooler and run it until it goes. I suggest you do the same.

355TurboLT1

iTrader: (11)

That's not what I have seen. The drum is the weak link in that thing and a 34 element sprag is a band aid approach to a much larger problem.You are still using the crappy drum with a stronger sprag. Its a matter of how long will it last at 1000hp. I went with Rossler. He has seen quite a few drums explode on 1000 hp turbo cars. My opinion is spend the money now. Again Sk perfomance has the parts you need. Never heard of the output shafts ever needing any attention whatsoever.

xXxSilveradoxXx

iTrader: (5)

My bad, I'm thinking 60/65/70-Es.

lmt0705

iTrader: (7)

lots of different opinions on shafts

lmt0705

iTrader: (7)

well went with a top of the line rossler built 4l80e with a brake and a 2.10 gear set. Its a lot more than I wanted to spend but i dont want to skimp and have any issues. starting the swap soon.

hawkls7

Its not sk performance , ck performance. i have used most of his parts , behind my 1100 rwhp with no problems with 36 element sprag and his modified drum to suite . but his customer ethics arent the best , maybee he has improved

Ricky Bobby

I have a 4l80 with trans brake, 3800 stale from rodney at RPM and I have 900 plus RWHP 1/4 mile @ 8.81,8.89 1.32 60ft 156 mph many 9 sec passes ,Drives to the track, and anywhere else for that matter gotta love overdrive!!