4l85e?
Thread Starter
TECH Enthusiast
Joined: Apr 2009
Posts: 592
Likes: 238
From: Lewisville, TX
4l85e? Couple of questions im not finding definite answers to. Im receiving a basically free 5.3/4L85E combo out of an avalanche from a family member. My car is already wired for a 4L80. Are the wiring the same on those two transmissions and would I be able to control it with a factory PCM?
As far as i know, they only had the 4L85E option available in the very large box van. Really there isnt too much difference internally but a 5 pinion planet and a couple other minor things.
TECH Junkie
Joined: Jun 2008
Posts: 3,204
Likes: 1,391
From: Nitro Alley
I hate the internet... There is no point to GM having the 4L85E......
The aftermarket support for 3L80/THM400 and 4L80E is amazing!
Why mess around with planetary gear sets that need not messing around?????
The aftermarket support for 3L80/THM400 and 4L80E is amazing!
Why mess around with planetary gear sets that need not messing around?????
TECH Junkie
Joined: Dec 2012
Posts: 3,621
Likes: 1,335
From: Iowa
Factory th400 gearset from the 70's at over 1500 horst.
Other guys have them at higher power than that.
Planets are not at all a weak point on an 80e
Did 85e denote straight cuts? Because I have actually seen a thrust benefit from straight cut planets in BIG box trucks/grain trucks/etc
Other guys have them at higher power than that.
Planets are not at all a weak point on an 80e
Did 85e denote straight cuts? Because I have actually seen a thrust benefit from straight cut planets in BIG box trucks/grain trucks/etc
Thread Starter
TECH Enthusiast
Joined: Apr 2009
Posts: 592
Likes: 238
From: Lewisville, TX
I was told it's a 4l85e. I havent yet laid eyes on it yet. A quick google search yielded this from Gearstar transmissions.... " You can find GM 4L85E transmissions in a number of vehicles, including the Chevrolet Avalanche, GMC Savana, Chevy Suburban, and GMC Yukon." Im just tossing this setup in the car for now to have a running vehicle while I finish building my other 5.3l and 4l80.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo TECH Junkie
Joined: Jun 2008
Posts: 3,204
Likes: 1,391
From: Nitro Alley
Factory th400 gearset from the 70's at over 1500 horst.
Other guys have them at higher power than that.
Planets are not at all a weak point on an 80e
Did 85e denote straight cuts? Because I have actually seen a thrust benefit from straight cut planets in BIG box trucks/grain trucks/etc
Other guys have them at higher power than that.
Planets are not at all a weak point on an 80e
Did 85e denote straight cuts? Because I have actually seen a thrust benefit from straight cut planets in BIG box trucks/grain trucks/etc
There should be NO thrust in the section with straight gear sets... Any thrust would be from outside forces and not the gear set.
If any of you guys run straight tooth gear sets and have thrust generated by the gears... You have a problem.
TECH Junkie
Joined: Dec 2012
Posts: 3,621
Likes: 1,335
From: Iowa
Hence the thrust benefit...no excessive wear on the output bushing (or bearing when I build one) due to thrust.
But...for a race car, most of the time it's not necessary.
4200 lbs running 9's...probably necessary...most other stuff it's a waste if you're trying to hunt down straight cuts
But...for a race car, most of the time it's not necessary.
4200 lbs running 9's...probably necessary...most other stuff it's a waste if you're trying to hunt down straight cuts