4l60e 1-2 shift
Thread Starter
Teching In
Joined: Sep 2020
Posts: 8
Likes: 1
4l60e 1-2 shift so I just got done test driving the "new" transmission. Everything seems fine other than the 1-2 shift. Its a long shift and has a little flare like its slipping. Is this something the 1-2 accumulator will fix or is it caused by a different problem?
TECH Junkie
Joined: Jun 2008
Posts: 3,202
Likes: 1,390
From: Nitro Alley
What you are feeling could be related to the 2nd accumulator...
Remove the pan and take a look in the 2nd accumulator housing.
Check for any leakage from one side of the accumulator piston to the other (also where the pin seals to the piston).
Remove the pan and take a look in the 2nd accumulator housing.
Check for any leakage from one side of the accumulator piston to the other (also where the pin seals to the piston).
Thread Starter
Teching In
Joined: Sep 2020
Posts: 8
Likes: 1
should I just go ahead and do the sonnax pinless accumulator upgrade since I will be in there? Also is the 3-4 accumulator the same as the 1-2? I'm just trying to do everything I can while I'm in there without taking the VB off. I'm not confident enough in myself to put it back together right.
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
3/4 accum is not the same. different pin bore diameter
Block the 3/4 accum with a setscrew and throw the piston in the trash
Use the 3/4 accum spring on the opposite side of the 1-2 accumulator piston spring.
So the stackup will go
separator plate
reused 3/4 accum spring
piston
1/2 stock accumulator spring
housing
Also...check band clearance
Sloppy 1-2 can be the result of loose band
Block the 3/4 accum with a setscrew and throw the piston in the trash
Use the 3/4 accum spring on the opposite side of the 1-2 accumulator piston spring.
So the stackup will go
separator plate
reused 3/4 accum spring
piston
1/2 stock accumulator spring
housing
Also...check band clearance
Sloppy 1-2 can be the result of loose band
Teching In
Joined: Sep 2020
Posts: 42
Likes: 2
How on Earth would we know? You have to diagnose it, and maybe, just maybe if you could tell us if it has any codes it may help. Any number of things come to mins, from a faulty VB gasket, servo problem, accumulator problem, etc. Is it full of fluid? have you reset the adapts? have you checked pressures? Band clearance?
Thread Starter
Teching In
Joined: Sep 2020
Posts: 8
Likes: 1
How on Earth would we know? You have to diagnose it, and maybe, just maybe if you could tell us if it has any codes it may help. Any number of things come to mins, from a faulty VB gasket, servo problem, accumulator problem, etc. Is it full of fluid? have you reset the adapts? have you checked pressures? Band clearance?
Teching In
Joined: Sep 2020
Posts: 42
Likes: 2
if there was codes I would have said it was throwing a code. And for the adapts wouldn't it be the same shifting through every gear not just 1-2? 1/2 quart over filled. It feels like it could be a band problem to me. I got ahold of the builder and he's just going to bring my original 98 trans back rebuilt
Trending Topics
Thread Starter
Teching In
Joined: Sep 2020
Posts: 8
Likes: 1
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
TECH Apprentice
Joined: Jun 2021
Posts: 314
Likes: 17
From: The Niagara Frontier
3/4 accum is not the same. different pin bore diameter
Block the 3/4 accum with a setscrew and throw the piston in the trash
Use the 3/4 accum spring on the opposite side of the 1-2 accumulator piston spring.
So the stackup will go
separator plate
reused 3/4 accum spring
piston
1/2 stock accumulator spring
housing
Also...check band clearance
Sloppy 1-2 can be the result of loose band
Block the 3/4 accum with a setscrew and throw the piston in the trash
Use the 3/4 accum spring on the opposite side of the 1-2 accumulator piston spring.
So the stackup will go
separator plate
reused 3/4 accum spring
piston
1/2 stock accumulator spring
housing
Also...check band clearance
Sloppy 1-2 can be the result of loose band
the alum legged piston put in last using type 2 springs & piston w/legs (legs pointing inward) in the type 3 hsg?
A. (plate --> legged piston --> type 2 springs --> type 3 housing)
the Sonnax pinless piston w/type 3 TG springs and ball pounded into housing after removing pin?
B. (plate --> Sonnax pinless --> type 3 springs --> type 3 housing)
the aluminum type 2 piston using type 2 springs into Acc hsg, then type 2 piston with legs (which direction should legs point--into housing, or towards plate?), and the 3-4 spring last, between piston & plate?
C. (plate --> 3-4 acc spring --> legged piston --> type 2 springs --> type 3 housing)
???
Thanks
Last edited by matermark; Mar 29, 2022 at 07:20 PM.
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
whichever way you like
You're mixing and matching parts and bouncing around so many threads nobody can keep up
Take some time, experiment with feed hole sizes and accumulator springs and accumulator regulator valve springs and sleeves and valves.
There are literally 100's of combinations using just factory parts and altering feed hole sizes. If you're going to start using shift kits but throwing your own spin on them...you'll have to get used to dropping the pan and making changes a bunch of times...Just like anybody else already did that gives out advice
You're mixing and matching parts and bouncing around so many threads nobody can keep up
Take some time, experiment with feed hole sizes and accumulator springs and accumulator regulator valve springs and sleeves and valves.
There are literally 100's of combinations using just factory parts and altering feed hole sizes. If you're going to start using shift kits but throwing your own spin on them...you'll have to get used to dropping the pan and making changes a bunch of times...Just like anybody else already did that gives out advice
