LS-1motor 4L60-E tranny
Thread Starter
Teching In
Joined: Jun 2013
Posts: 2
Likes: 0
LS-1motor 4L60-E tranny I have a 99 vette LS-1 motor and a 99 Yukon 4L60-E tranny. The bell housing bolt pattern does not match the LS-1 bolt holes, no 12 o'clock in bell housing. I thought all 4L60-E bolted up to all LS-1 motors. Where are I wrong? Tks any help. I think I got everything else handled except tuner in Richmond VA area that also convert my 99 Suburban wiring harness.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
The LS1 Corvettes use the LT-style trans with 298 input shaft. I.e. the older pre-LS style. Sometimes I and others forget to mention that "detail". I apologize if one of my posts here mislead you.
OOPS - I thought you were hooking up a Corvette trans to a LS1 motor. Sorry.
OOPS - I thought you were hooking up a Corvette trans to a LS1 motor. Sorry.
Last edited by mrvedit; Sep 15, 2014 at 12:30 PM.
Thread Starter
Teching In
Joined: Jun 2013
Posts: 2
Likes: 0
The ls1 motor does not match up to the lt1 bell housing bolt pattern. The ls1 has a hole hole at 12 o'clock. The lt1 motor does not.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Sorry, I misread your original post. See my Oops abov in #2.
Based on how I read this Wikipedia article, the '99 was the last year the Yukon had an older style SBC/LT1 engine and not the LS1 that came out for it in 2000:
http://en.wikipedia.org/wiki/Chevrolet_Tahoe
Therefore, the transmission would be an LT-style 4L60E with a 298mm input shaft. It would require a spacer, special flexplate and LT-style converter to hook up.
As Brian mentioned, a picture of the front input shaft will remove all doubt.
Based on how I read this Wikipedia article, the '99 was the last year the Yukon had an older style SBC/LT1 engine and not the LS1 that came out for it in 2000:
http://en.wikipedia.org/wiki/Chevrolet_Tahoe
Therefore, the transmission would be an LT-style 4L60E with a 298mm input shaft. It would require a spacer, special flexplate and LT-style converter to hook up.
As Brian mentioned, a picture of the front input shaft will remove all doubt.
Last edited by mrvedit; Sep 16, 2014 at 08:28 AM.
