2000SLPZ28

i heard around that there is a 4L70E auto tranny that chevy is using now. it its true then how good is it?

performabuilt

iTrader: (25)

For the most part a 4l70e is just a 4l60e/65e with the addition of and input speed sensor from looking inside no significant durability improvement

bjamick

iTrader: (31)

Ans its 10 less than the 4L80E so it sux LOL JK man

koolaid_kid

iTrader: (21)

Then I want a 4L90E!!!
Let's get Performabuilt on it right away!

Jon5212

iTrader: (2)

Anyone thought about trying to retrofit an Allison tranny in an F-Body from the HD trucks? Just a thought....

jakes4321

iTrader: (7)

Allison might just be a lil heavy and a lil big for an f-body....
I have a 4l70 in my tbss and it held up for about a year. It was slippin going into od every so often so out it came and it went to FLT. I dont believe the 4l70 is any stronger then 60/65e....But thats only my opinion

silver-mod-o

iTrader: (15)

a regular 1/2 ton truck needs a 2" body lift just to fit an ally trans... I can only imagine the surgery needed to fit one in an F-bod.

Jon5212

iTrader: (2)

Well just an idea since the Allison can handle quite a bit of power.

TwoFast4Lv

iTrader: (8)

I personaly question the strength at the new Pick up point on the input shaft. We KNOW 4L60s never break input shafts

sslowered

iTrader: (2)

My 2006 Trailblazer SS has the 4L70E and this is what a stock LS2 did to it:





Most of the guys on the forum went with built trannies and if your going to spend the money on one why not make it a 4L80E!

Here a look at the thread for the whole story:
http://forums.trailvoy.com/showthread.php?t=22724

performabuilt

iTrader: (25)

thats failure of wow magnatude but I dont think its due to power. looks like the sunshell had a bad day

FLT

iTrader: (1)

I personally believe that the input drum came apart, locked up and spit it through the case. I saw this happen on a 350 and the direct drum was totally gone. Just my observation. Vince

FLT

iTrader: (1)

That is probably why we are working on a billet version.

performabuilt

iTrader: (25)

I think your right on the input drum vince , just noticed that still very unusual

FLT

iTrader: (1)

I guess I'm kinda sick that way. I live to see new carnage. "You must be one with the trans"LOL

performabuilt

iTrader: (25)

actualy its a little scary looking makes you think about a scatter shield or blanket

TwoFast4Lv

iTrader: (8)

That is why I insist on a shield/blanket I agree on the input drum.

BTW at what level are you guys seeing broken shafts?

performabuilt

iTrader: (25)

Well we havnt seen a broken shaft yet ,Well not entirly true we did have one broken output shaft but the persona rear end had a spider gear go through it so was understandable

sslowered

iTrader: (2)

Good eye Vince!! Thats what the dealership thought happened too. I think this is the extreme of what could happen with stock trans.

FLT

iTrader: (1)

We normally see it in truck applications due to the weight and torque of the vehicles. It does happen from time to time in a car that runs slicks with wheels up launches. It does not happen often but does happen. We are looking to do this to make these units stronger of course. Vince