4l60e shift problem
Thread Starter
Junior Member
Joined: Feb 2013
Posts: 9
Likes: 0
From: Pageland S.C.
Car: 89 IROC-Z
Engine: LS1
Transmission: Auto
4l60e shift problem
Just finished installing a ls1 4l60e combo in my 89 IROC. Everything is working great except my transmission won't shift under power. Any ideas?
Supreme Member
Joined: Jun 2011
Posts: 2,036
Likes: 5
From: knoxville tn
Car: 86 IROC
Engine: 5.0 TPI
Transmission: 700-R-4
Axle/Gears: 2.73 open
Senior Member
Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: 4l60e shift problem
May be running into the same problem I had. Everything worked great till wide open throttle. Mine would not shift 2-3 at WOT. Pulled trans and found I had allready glazed the 3/4 clutches ( about 30 miles on trans ). Installed Transgo 4L60E-HD2 shift kit. Have yet to drive it again. Will see if it cured it in about a week.
Senior Member
Joined: Mar 2003
Posts: 851
Likes: 3
From: vacaville,ca
Car: 1988 camaro z28,1997 camaro lt1
Engine: 355 afr 195 heads,tpis big mouth
Transmission: 700r-4 built by me 3-4 z pack
Axle/Gears: 3.42
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