4L80e trans question
Thread Starter
Pro
Joined: Feb 2006
Posts: 543
Likes: 0
From: powhatan va.
4L80e trans question
i have a 93 vette with the 700r in it with 125,000 on it. it probably isnt going to last a long time with me spraying a 125 shot to it so im thinking ahead about a trans change when it does go. i seen some people put the 4L80e trans in there cars , what is involved in doing this as far as what i have to get other than trans to make it fit in my 93.
Race Director
Joined: Nov 2000
Posts: 17,103
Likes: 39
From: stop the fun suckers
I think it also requires modification of your "spine/backbone" as well as modification to your ASR..etc..etc..
The long and short of it is you could build a 700R4 to handle 500hp+ (some people claim 700hp but i'm skeptical about that).. or you could put in a pis*ed off TH400 with a gear vendors overdrive and have a 6 speed for about 3k and keep all your stock programming/ECM and get far supior miliage and strength... but in my book PeteK is the authority on all things C4 tranmission related..
The long and short of it is you could build a 700R4 to handle 500hp+ (some people claim 700hp but i'm skeptical about that).. or you could put in a pis*ed off TH400 with a gear vendors overdrive and have a 6 speed for about 3k and keep all your stock programming/ECM and get far supior miliage and strength... but in my book PeteK is the authority on all things C4 tranmission related..
Pro
Joined: Mar 2000
Posts: 658
Likes: 7
From: Perth Amboy New Jersey
Originally Posted by bigwave71
i have a 93 vette with the 700r in it with 125,000 on it. it probably isnt going to last a long time with me spraying a 125 shot to it so im thinking ahead about a trans change when it does go. i seen some people put the 4L80e trans in there cars , what is involved in doing this as far as what i have to get other than trans to make it fit in my 93.
Yedi
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
After reading earlier posts by bacardioil about his 4L80E swap,
I looked up Performance Automotive and Transmission Center and
read about their offerings.
Part way down the page here, they state they will soon have what
appears to be a bolt-in replacement for the C4 700R4
. 
. 
bacardioil has posted some reservations about the strength of the tail
housing and mentioned that he chose a different approach. If he can,
a post with more information describing the differences between TC's
method and the approach used for his install (and perhaps pictures)
would be helpful.
.
I looked up Performance Automotive and Transmission Center and
read about their offerings.
Part way down the page here, they state they will soon have what
appears to be a bolt-in replacement for the C4 700R4
Originally Posted by Transmission Center
"Swap your 700R4 / 4L60E transmission to the much stronger
4L80E transmission with our new double strength case hardened output
shaft and adapter kit.
At this time we have in development an adapter kit for the C4 Corvette
to replace your 700R4 / 4L60E transmission with the much stronger
4L80E transmission. This 4L80E transmission will be the same length as
your 700R4 / 4L60E transmission making it possible to reuse your
existing 27 spline driveshaft and C-beam.
All that needs to be changed on the 4L80E transmission is the tail
housing and output shaft. The full manual shift model works without a
computer. These should be ready to sell by August 25, 2006 ...
4L80E transmission with our new double strength case hardened output
shaft and adapter kit.
At this time we have in development an adapter kit for the C4 Corvette
to replace your 700R4 / 4L60E transmission with the much stronger
4L80E transmission. This 4L80E transmission will be the same length as
your 700R4 / 4L60E transmission making it possible to reuse your
existing 27 spline driveshaft and C-beam.
All that needs to be changed on the 4L80E transmission is the tail
housing and output shaft. The full manual shift model works without a
computer. These should be ready to sell by August 25, 2006 ...
. . bacardioil has posted some reservations about the strength of the tail
housing and mentioned that he chose a different approach. If he can,
a post with more information describing the differences between TC's
method and the approach used for his install (and perhaps pictures)
would be helpful.
.
Burning Brakes
Joined: Apr 1999
Posts: 758
Likes: 1
From: Cumming GA
Originally Posted by bigwave71
i have a 93 vette with the 700r in it with 125,000 on it. it probably isnt going to last a long time with me spraying a 125 shot to it so im thinking ahead about a trans change when it does go. i seen some people put the 4L80e trans in there cars , what is involved in doing this as far as what i have to get other than trans to make it fit in my 93.
Unless your making 700HP or more, I would keep your 4L60E and have RPM Transmissions, in Sulphur Springs IN, rebuild it to a 4L65E. Talk to Rodney.
I put a 4L80E in my vette, and its heavy and I had to change the 1st and 2nd gear, to get more inline with the 700 0r 4L60. RPM did the work. I opted for the 4L80e for future twin turbo settup.
The 4L80e Comes Factory with a 1st 2.48 where the 4L60e is a 3.06 This will impact your 60ft times hugely as I learned last year. Coan and Rossler sell gears, which I bought so I am running a 1st 2.75 2nd 1.57 3rd 1:1 4th .75:1
I admit however, you cant hurt it. But it will requie modifications to your stock Torque Arm. The shifter assemble will all work fine, no cutting of the tunnel either.
I am using Bigstuff3 for the Engine and Transmission.
John
Thread Starter
Pro
Joined: Feb 2006
Posts: 543
Likes: 0
From: powhatan va.
thats a lot of good info gents. thank you. i didnt think about the gears being different in first and sec. that would have been ugly. looks like i will stay with the 700r and just build it the best it can be. i had the engine chassis dynoed and on the 125 shot, im getting 371 rwhp with 401 rwtorque, so looks like i will be ok if i build it. thanks again for the info.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Originally Posted by bigwave71
thats a lot of good info gents. thank you. i didnt think about the gears being different in first and sec. that would have been ugly. looks like i will stay with the 700r and just build it the best it can be. i had the engine chassis dynoed and on the 125 shot, im getting 371 rwhp with 401 rwtorque, so looks like i will be ok if i build it. thanks again for the info.
