differential
Instructor
Joined: Feb 2005
Posts: 242
Likes: 2
From: Mims Florida
Going from 2.73 to 3.42
Every thing will bolt right in, but you will have to have your transmission shift points reset and the gear change set up in the computer. If you don't you will get a code P1870 ( transmission slip ) because the computer checks engine and output shaft speed when you are in 4th gear and the converter is locked. It will be thinking that the engine should be spinning slower cause it is programed for a 2.73. It interpets the extra engine speed as torque converter slip and sets the code P1870. Then the shifts get real ugly. It also inhibits the torque converter from locking again.You have to reprogram, I did mine with a Predater.
Last edited by vettezeke; Aug 3, 2009 at 06:36 PM.
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
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Tech Contributor
Joined: Aug 1999
Posts: 16,376
Likes: 404
From: Should this thoughtful, valuable contribution meet with no acknowledgement or 'thanks' this post----
Me too...that was my initial thread that Patches quoted for you to read...best to be completely prepared.
Le Mans Master
Joined: Aug 2006
Posts: 9,987
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From: If opportunity doesn't knock, build a door. South West Florida / Livin' The Dream
St. Jude Donor '12
If you are dropping everything to do the gears then do a new high stall converter at the same time. You'll be glad you did.
