4L60E slipping on 1-2 shift
Thread Starter
11 Second Club
Joined: Nov 2017
Posts: 178
Likes: 26
From: Kentucky
4L60E slipping on 1-2 shift Last night coming home I noticed my car seemed really sloppy in 2nd gear. Well this morning, it's started to really slip the 1-2 shift, it use to be pretty snappy. The 2-3 shift is still firm. Is the trans on its way out or is it just a simple fix? It has no check engine lights and the car has 120k miles on it.
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
See how many qts you are low on fluid...that's the first place to look.
But, when you say it's slipping the one two...what exactly do you mean? Like it takes a while to engage? Feels like it "slides" into gear?
etc
But, when you say it's slipping the one two...what exactly do you mean? Like it takes a while to engage? Feels like it "slides" into gear?
etc
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
it does not disengage 1st.
1st gear has the fwd clutches engaged
2nd gear needs the fwd clutches AND the band.
So...1st never gets "disengaged"
Even if you left the band out of the trans...1st isn't going to "disengage"...it will just stay in 1st gear
Are we sure there's not some placebo effect here?
If it's just lazy...you can do a pressure test, but it is not uncommon for the band clearance to get farily loose and shift lazily.
There are other VB issues to check, but easiest checks are line pressure and band clearance (use a pry bar against the servo cover and estimate travel. More than 1/8" is no bueno
1st gear has the fwd clutches engaged
2nd gear needs the fwd clutches AND the band.
So...1st never gets "disengaged"
Even if you left the band out of the trans...1st isn't going to "disengage"...it will just stay in 1st gear
Are we sure there's not some placebo effect here?
If it's just lazy...you can do a pressure test, but it is not uncommon for the band clearance to get farily loose and shift lazily.
There are other VB issues to check, but easiest checks are line pressure and band clearance (use a pry bar against the servo cover and estimate travel. More than 1/8" is no bueno
Registered User
Joined: Sep 2024
Posts: 2
Likes: 0
hey i also have that problem. im not sure when it happened but it was random, i was driving normal and everything was shifting fine. a few hours later i was starting a race in 1st and floored it. this time instead of the smooth shift it redlined and i letoff then it shifted. it shifts late from 1-2, my vss is off and so is my tps. what do yall think?
Thread Starter
11 Second Club
Joined: Nov 2017
Posts: 178
Likes: 26
From: Kentucky
Old thread, but I'll come back to it. Mine ended up being 2-4 band. Which never made sense to me since 4th gear worked perfectly fine. I just bought a built trans to replace the stock one. I did drive it around like that for months though so if you need time to save to rebuild you can do so. No clue what causes the band to get excessive clearance as I'm not a trans expert. But I think if you're having the SAME problem, it's safe to assume it's the same issue. 1st, 3rd and 4th gear under load is fine and 2nd gear just free revs like it's in neutral.
Get your VSS and TPS sorted out before you start digging into a trans problem though.
Get your VSS and TPS sorted out before you start digging into a trans problem though.
Trending Topics
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
Old thread, but I'll come back to it. Mine ended up being 2-4 band. Which never made sense to me since 4th gear worked perfectly fine. I just bought a built trans to replace the stock one. I did drive it around like that for months though so if you need time to save to rebuild you can do so. No clue what causes the band to get excessive clearance as I'm not a trans expert. But I think if you're having the SAME problem, it's safe to assume it's the same issue. 1st, 3rd and 4th gear under load is fine and 2nd gear just free revs like it's in neutral.
Get your VSS and TPS sorted out before you start digging into a trans problem though.
Get your VSS and TPS sorted out before you start digging into a trans problem though.
So you are dealing with 2 clearances no just one. I go into this in the 4l60e tech thread and my build thread.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
11 Second Club
Joined: Nov 2017
Posts: 178
Likes: 26
From: Kentucky
Many forget that when dealing with band clearance. You are actually dealing with 2 clearance not 1. One is 4th servo to band pin the other second servo to band pin and second is a bit more complicated with the cushion spring being part of it. You can have a solid perfect 4th servo clearance and still have excessive second servo as the second servo cushion spring cover must not only hit but fully compress the spring for one to have full apply in second.
So you are dealing with 2 clearances no just one. I go into this in the 4l60e tech thread and my build thread.
So you are dealing with 2 clearances no just one. I go into this in the 4l60e tech thread and my build thread.
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook