Changing gear ratios on 4T60-E - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-01-2010, 07:19 PM   #1
Senior Member
Certified GM nut
Thread Starter
 
SignOfZeta's Avatar
 
Join Date: Mar 2005
Location: New Milford, CT
Posts: 2,284
Thanked 16 Times in 13 Posts
SignOfZeta has a spectacular aura aboutSignOfZeta has a spectacular aura about
Default Changing gear ratios on 4T60-E

I've got a '97 SE with the 2.84 gear ratio (F17). Now, it feels like it'* almost time for a rebuild, and from looking at local junkyards, it seems like the 3.06 gear ratios (FW2) are a couple of bucks cheaper.

After searching the forum, I didn't find any definite answers. If I bought a good 3.06-geared transmission, made sure it was okay, and threw in a shift kit, would I only need a PCM tune to recognize the new gear ratio?
SignOfZeta is offline   Reply With Quote
Old 02-01-2010, 07:30 PM   #2
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,638
Thanked 991 Times in 770 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Wow, that'* weird. I went from a 3.06 to a 2.84 trans a couple years ago. Never changed the PCM, only thing that happend was my PCM changed gears about 200RPM to early. In your case, the PCM would change gears about 200RPM late.

Yup, swap trans, change the PCM.
Mike is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Gear Ratios Merlin 91/97 1992-1999 1 06-15-2006 08:32 PM
FYI if you lose 4th gear / no fourth gear / no 4th gear caminated2k 2000-2005 6 07-24-2005 11:26 PM
Can someone give me a lesson on gear ratios? ComfyCar General GM Chat 12 07-20-2005 12:39 AM
gear ratios macho_mike21 General GM Chat 4 08-04-2004 04:23 PM
Gear/axle ratios questions OLBlueEyesBonne General GM Chat 9 09-23-2003 04:32 PM


Tags
automatic, f17, fw2, swap, transmission

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:29 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.