stricker76

Still in the planning stages of my ls1 swap, and trying to find a tranny now. After looking at some pricing on 4L80's and torque converters, i got wondering about a t56. Question is, will a stock t56 take 450hp, or will i need to have some work done to it?

02SOMWS6

iTrader: (6)

stock will handle it. If it's out you might want to get a price on having billit or solid sliders keys put in. That single upgrade will keep it going for a Very Long time

thesource

iTrader: (60)

A stock T56 will handle 450 . I start seeing failures around 650-700 rwhp .

defenestrate

iTrader: (1)

yeah maybe something like six speed inc. stage 1 or 2 for peace of mind?

stricker76

Sounds good guys. I'll get a price on a few peace-of-mind upgrades. What about a clutch? Can get the stock low-mile stuff with the tranny, but thinking about upgrading while it's apart. Any suggestions?

vetteboyc5

iTrader: (9)

Mine failed with 415WHP (99 corvette) broken slider keys...

Thats a must everything else will work pretty good

thesource

iTrader: (60)

Broken shift keys have nothing to do with the power your car is making . I was talking more about actual breakage of parts like the gears and mainshaft . I see Corvette mainshafts fail around 650-700 rwhp but can snap with less power if the car gets bad wheel hop .

BriancWS6

iTrader: (18)

People run some rediculous times and power levels with a stock T-56. At 450 hp, you have nothing to worry about.

As far as a good clutch, look no further than TEXtralia. For your application the OZ700 Z grip would work good. Been running one for 2.5 yrs and over 20,000 miles. Hasnt missed a beat.

Tavarez

destroyed gears and snapped my mainshaft with a mere 450hp. No idea how that was enough power, I guess abuse over time can make stuff break. One to two shift = broken rear end which ended in a destroyed tranny. It could have been the weak link in the differential that caused my tranny to go. I guess the message here is, it really depends on your other weak links. A DTE brace could help you save your tranny incase you snap your differential.

PewterScreaminMach

iTrader: (7)

My brother's went with just bolt-ons and mine went with 400ish rwhp (both start popping out of third gear and mine locked up in 4th after a high RPM run). The stock clutches also aren't good for much more than basic bolt-ons most of the time. If you're building a nice H/C car, I'd suggest looking into a low- to mid-level tranny from Six Speeds Inc and a decent clutch at least. Peace of mind is worth a lot of money in my eyes.

strokerblackhawk

iTrader: (4)

i'm still runnin my stock tranny w over 450rwhp but i had to rebuit part of it (with only 348rwhp and 355rwtq i broke it) cause it would kick outta third gear, then one night while racing a supra the damn thing locked it self in fourth gear and we had to roll it back in forth at a gas station to get it outta gear also they told me it was because my clutch wasn't fully dissengaging and when i power shifted it it bent the 3-4 shift fork, but im getting six speeds inc. to rebuild it strong soon. so if you run a stock one make sure you get a good clutch, stock clutches and power shifter will tear one up in a heart beat.

WKMCD

iTrader: (2)

I run 510/470 RW and the tranny is the only thing stock on my car. When I spoke with Rodney at RPM he told me he'd never pull one unless there was a problem already. You're fine stock.

defenestrate

iTrader: (1)

tex. clutches are pretty expensive, there are a lot of guys on here that run an ls7 clutch ( a lot of sponsors sell them) i put one in and i love it. an ls7 clutch should be good for 450, a lot cheaper too.

Black FormulaLs1

iTrader: (10)

TICK PERFORMANCE is runnin a sale right now...a stage 2 build for the price of a stocker..just got mine built by them will post up with results when i get it installed $1265 out the door WITH new bearings....

stricker76

Seems to be hit and miss on whether it will take it or not. It is a take-out tranny out of a brand new gto, so maybe i'll just run it and see what happens. I don't drive it often or very hard when i do anyhow. I'll start looking for an LS7 clutch.

Sluggish

iTrader: (10)

LS7 should be fine. I'm around 575rwhp on the stock t56 and have had no issues.

defenestrate

iTrader: (1)

seems like you should honestly be fine with it, unless you truly beat the **** out of it. did you actually buy the tranny yet? if not, maybe look at a viper spec t56.

stricker76

Already bought the tranny, and got a killer deal on it, which is why i thought i might spend a few bucks on some upgrades. For now i'll keep it stock and spend a few bucks on a clutch and shifter.

Oh, and sorry if this is a stupid question (i'm new to manual trannies), but what is the difference between an aluminum and steel flywheel? I know the aluminum is lighter, but is it more for racing than a streetcar?

defenestrate

iTrader: (1)

i went with the ls2 flywheel(steel i think) aluminum is lighter and i see some people say better throttle response but the car feels smoother with the heavier (steel) flywheel, i like it a lot over stock. i've heard problems with people messing up the aluminum, if i were you i would go with the ls7clutch/ls2 flywheel combo, its cheap will hold your power fine. just think if it can hold the ls7 ok it will manage your car fine.

PewterScreaminMach

iTrader: (7)

The aluminum flywheel is typically used more for auto x as it's lighter weight and winds out quicker, but from what I hear it doesn't hold the RPMs up as well on the shifts, which makes it, umm, less good for drag racing. But I've seen people run both. I stuck with the steel like most for drag racing.