Slipping shifts, no lockup
Thread Starter
12 Second Club
iTrader: (13)
Joined: May 2006
Posts: 262
Likes: 1
From: Milwaukee, WI
Slipping shifts, no lockup I've got a 4L60E that was just built by a local builder with all the good hard parts and some modifications like the removed check ball on the input shaft, a Trans Go shift kit, etc. Standard build. Since day 1 it's had an intermittent lock up (usually locks up ok once it warms up) problem but everything else has been rock solid. Yesterday after doing some hard lanches for scanning, it started having some problems on the 1-2 shift. It revs to around 4k before it struggles to shift, and I'm pretty sure it's either skipping 2nd and going right to 3rd or just barely touching 2nd and then shifting into 3rd right away. It's also throwing a P0748 code (pressure control solenoid electrical). So my question is, could this be caused by a bad PCS or wiring harness? IE, low or sporatic line pressure? Any help is appreciated.
Could be caused by presure issues but if your skipping second then you likley have damage to the band at this point,
I would pull pan and look around.
I would pull pan and look around.
__________________
Actually generally a PCS electrical code will cause quiet the oposite max line presure very harsh shifts. However anything is possible.
__________________
Thread Starter
12 Second Club
iTrader: (13)
Joined: May 2006
Posts: 262
Likes: 1
From: Milwaukee, WI
That's what I thought too, but it doesn't seem to be going into limp mode. I'm gonna drop the pan tonight to see if there is any mechanical damage, but I stopped driving it as soon as it started slipping. I'm hoping it's just a pressure issue and there isn't any damage to hard parts.
Last edited by Mr. Brett; Apr 29, 2009 at 11:23 AM.
Thread Starter
12 Second Club
iTrader: (13)
Joined: May 2006
Posts: 262
Likes: 1
From: Milwaukee, WI
Found a bit of black powder in the pan, but nothing major. If I had a few more miles on the thing I'd almost consider it normal wear. I did verify that it has little to no 2nd gear, though. I can force it into 2nd and it just free revs up to about 4k and then kind of grabs a little bit. Can't really tell if it's going into 4th or not since I didn't drive it that far or fast. I'm guessing it's the 2-4 band? Not sure why it's throwing the 748 code. More than one issue inside this thing?
Trending Topics
Thread Starter
12 Second Club
iTrader: (13)
Joined: May 2006
Posts: 262
Likes: 1
From: Milwaukee, WI
Anybody that can chime in? I'd like to get a good idea of what I'm looking at before I go back to the builder. Could it possibly be a servo or is the band definitely shot?
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
