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Old 01-19-2007, 11:53 PM
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4L60E v 4L80E

I am going to install a LS1 engine in my 41 Chevy Pickup. The truck will be strickly street and no towing. I have my choice of trans. My question is does the 80 have any advantage over the 60? I know the 80 cost alot more. Thanks. I don't know much about these trans.

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Old 01-19-2007, 11:58 PM
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correct me if im wrong
4 (amount of gears) L (longitutal vs transversal) 60/80(power rating)E(electronic)

80 is stronger, i would go with it because 300 or more horse will just break that 4l60e tranny
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Old 01-20-2007, 12:11 AM
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The 4L80E is an electronic overdrive transmission derived from the venerable Turbo 400. The 4L60E is basically an electronic transmission derived from the 700-R4. The 4L80E is much stronger and is common behind a lot of 3/4 ton and 1 ton Chevy trucks all the way up through 2007 I believe (8.1 and Diesel engines excluded) I think this trans may have also been installed in some cars too. If your LS1 is pretty much stock then you could probably use a 4L60E and be fine.
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Old 01-20-2007, 12:14 AM
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i thought 3l80 was from th400 and 4l80 was a successor?
maybe im wrong well
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Old 01-20-2007, 01:05 AM
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3l80 is a 400, just like a 4l60 is a 700r4 but a 4l60e is different than a 4l60 trans.

peace
Hog
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Old 01-20-2007, 10:50 AM
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I will only add there was never a non electronic 4L80E tranny released to the public.


Seems a myth comes up now & then about an over drive 4L80 non electronic tranny in vehicles from GM
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Old 01-20-2007, 02:20 PM
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I dont see what would be wrong with the 4l60e. Got trailblazer SS with a 400horse LS2. I have tried to break it. Its still going.
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Old 01-20-2007, 03:03 PM
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Quote:
Originally Posted by DeathRattle
I dont see what would be wrong with the 4l60e. Got trailblazer SS with a 400horse LS2. I have tried to break it. Its still going.
Your TBSS has a 4l70e trans. Same ratios as a 4l60e, 700r4, 4l65e, etc.
It also has a ton of torque management which pulls timing to reduce power at key moments to allow the trans to survive.


Also, there was NEVER a NON electronic 4 speed overdrive version of the 4l80e trans.
peace
Hog
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Old 01-20-2007, 04:37 PM
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Quote:
Originally Posted by Hogg
Your TBSS has a 4l70e trans. Same ratios as a 4l60e, 700r4, 4l65e, etc.
It also has a ton of torque management which pulls timing to reduce power at key moments to allow the trans to survive.


Also, there was NEVER a NON electronic 4 speed overdrive version of the 4l80e trans.
peace
Hog
the L70E is the same basic tranny as L60E. I have one(70E) in pieces on my bench at work
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Old 01-21-2007, 02:56 AM
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Tony,
Can you elaborate on what the upgrades are to the 4L70E over the 4L60E or 4L65E.
I'm just curious.
I left the GM dealership just as the 4L65's were hitting the market.

I have a 4L80E on the bench, when it's done it will be a "4L80". Just walked in from the shop.
Any tips you want to pass on for the 4L80E's while your writing, feel free

This unit is getting the full manual conversion with 34 element sprag, Alto Reds in the direct, and other upgrades that I'm familiar with from TH400's.

One last question,
Does your company make a TH400 direct drum with the larger 36 element setup?
I know Coan and CKPerformance make them but just wondering if you guys do.

Thanks.
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Old 01-21-2007, 05:28 PM
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The 4l65e has some hardened internals and 5 pinion planets. The 4l70e has some different electronics and some stronger stuff over teh 60e/65e.

teh 70e still has teh same junk ratios in it. If you take out a 700r4/60e/65e/70 and ddrop in a thm350 you will drop about 4 tenths in the 1/4 mile. Simply because of less shift extension (rpm drop) due to the closer gearing of the thm350.

the 700/60e/65/70e trans have a nice deep 1st gear, but the engine drops out of teh powerband when it goes into 2nd. A igher stall TC helps, but tehn the 3.06:1 hurts traction.
the best ratios in a stock OD 4 speed IMO are the thm 200r4.


Yes you can make a 4l80e into a 4l80 trans by installing a manual valvebody, then all you have to worry about is locking the TCC.

peace
Hog
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Old 01-21-2007, 06:10 PM
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Hi Jake.

The L70E has a few changes from the L65E. As you know the L65E received 5 pinion planets, induction hardened input & output shafts, 1 more 3-4 friction.

The L70E has a revised design pump for a speed sensor on the input, different design boost valve. It also uses the new design sealing sleeve on the pump to case seal area introduced in 2005 model year.

The reluctor on the input shaft has 15 splines / notches introduced in the 4200 series engine in the TrailBlazer units. see photo



4L80E unit.... I would worry about the splines on the input shaft..



We are in the design process on stronger t-400 parts. Currently we see very few failures with a forged INT race and 34 element sprag. A sturdy 2nd gear setup in the t-400 must include some form of beef'd up containment for the INT clutch pressure plate. As you know the case lugs breaking away from the t-400 case is a problem in high HP situations.



IF you are interested.....the late design pump to case seal sleeve on the 4L60E line of trannys in photo. An O-ring is no longer used since 2005 model yr was introduced.



one last item:

Have you seen the different sized 2nd gear servo ? It is between the corvette and regular V-8 servo in the size of apply area....I installed one of the units in my 06 Silverado crewcab .... not much of a difference in shift feel.




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Last edited by Crosley; 01-21-2007 at 06:18 PM.
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Old 01-21-2007, 06:20 PM
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Funny you posted the pic of the 4L80 input shaft, I am checking this post with one in my hand. Just installed new teflon seals on it.

Breaking where the splines go into the OD carrier. Interesting.

Thanks.
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Old 01-21-2007, 08:09 PM
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Thanks for the pics.

I hope to do a 4l80e at some point.

peace
Hog
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