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Old Apr 15, 2007 | 11:18 PM
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Default 4l70e ?

i heard around that there is a 4L70E auto tranny that chevy is using now. it its true then how good is it?
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Old Apr 15, 2007 | 11:25 PM
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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
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Old Apr 16, 2007 | 11:29 AM
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Originally Posted by performabuilt
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
Ans its 10 less than the 4L80E so it sux LOL JK man
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Old Apr 16, 2007 | 11:49 AM
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Originally Posted by bjamick
Ans its 10 less than the 4L80E so it sux LOL JK man
Then I want a 4L90E!!!
Let's get Performabuilt on it right away!
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Old Apr 16, 2007 | 11:52 AM
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Anyone thought about trying to retrofit an Allison tranny in an F-Body from the HD trucks? Just a thought....
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Old Apr 16, 2007 | 03:51 PM
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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
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Old Apr 16, 2007 | 03:56 PM
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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.
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Old Apr 17, 2007 | 09:50 AM
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Well just an idea since the Allison can handle quite a bit of power.
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Old Apr 22, 2007 | 08:15 PM
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I personaly question the strength at the new Pick up point on the input shaft. We KNOW 4L60s never break input shafts
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Old Apr 22, 2007 | 09:58 PM
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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
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Old Apr 22, 2007 | 10:10 PM
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thats failure of wow magnatude but I dont think its due to power. looks like the sunshell had a bad day
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Old Apr 22, 2007 | 10:14 PM
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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
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Old Apr 22, 2007 | 10:16 PM
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Originally Posted by TwoFast4Lv
I personaly question the strength at the new Pick up point on the input shaft. We KNOW 4L60s never break input shafts
That is probably why we are working on a billet version.
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Old Apr 22, 2007 | 10:43 PM
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I think your right on the input drum vince , just noticed that still very unusual
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Old Apr 22, 2007 | 10:57 PM
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I guess I'm kinda sick that way. I live to see new carnage. "You must be one with the trans"LOL
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Old Apr 22, 2007 | 11:44 PM
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actualy its a little scary looking makes you think about a scatter shield or blanket
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Old Apr 23, 2007 | 12:23 AM
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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?
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Old Apr 23, 2007 | 01:28 AM
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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
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Old Apr 23, 2007 | 06:56 AM
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Originally Posted by Vince @ FLT
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
Good eye Vince!! Thats what the dealership thought happened too. I think this is the extreme of what could happen with stock trans.
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Old Apr 23, 2007 | 07:04 AM
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Originally Posted by TwoFast4Lv
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?

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
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