Race Car Tech Discuss anything related to road racing and auto X.

5th gear change out

Old 06-29-06, 03:18 PM
  #1  
Senior Member
10 Year Member
Thread Starter
 
designfreak's Avatar
 
Join Date: Jan 2005
Location: miami FL
Posts: 352
Likes: 0
Received 0 Likes on 0 Posts
5th gear change out

Im getting my tranny rebuilt next week at ISC and was thinking about dropping in the better 5th gear ( I currently have the stock 91 ratio now).......I was wondering if the people who had it thought it was worth the $?

I will be running Moroso, Daytona, Sebring, and Homestead.

Thanks in advance
designfreak is offline  
Old 06-29-06, 03:24 PM
  #2  
Full Member
10 Year Member
 
PaulyDee's Avatar
 
Join Date: Mar 2001
Location: Indianapolis
Posts: 245
Likes: 0
Received 0 Likes on 0 Posts
I would say it is well worth it. Especially since they are already rebuilding the tranny. A couple of hundred bucks makes for a real 5th gears vs. the overdrive like stock fifth. I can't speak for the tracks you mentioned, but it works well for MidOhio, VIR, IRP, Gingerman etc.
PaulyDee is offline  
Old 06-29-06, 03:58 PM
  #3  
GET OFF MY LAWN
10 Year Member
iTrader: (1)
 
jgrewe's Avatar
 
Join Date: Feb 2005
Location: Fla.
Posts: 2,838
Likes: 0
Received 0 Likes on 0 Posts
5th will still be an overdrive, it will be from a truck though which is .85:1 instead of about .7:1. It works great at every place but Daytona. We switch back and forth on the EP cars. It really is nice on the Sebring short course with a 5.12 rear end.
jgrewe is offline  
Old 06-29-06, 05:28 PM
  #4  
www.lms-efi.com
iTrader: (27)
 
C. Ludwig's Avatar
 
Join Date: Mar 2001
Location: Floyds Knobs. IN
Posts: 5,106
Received 30 Likes on 23 Posts
Well, the only legal ratio is the .756 from the GTUs. With that gear, 225/45 tires, and the 5.12 you're good to about 130mph at 8000rpm in 5th. I've heard that won't cut it at Daytona. But I've never been there. Ask around. Mike will know. Otherwise the shorter gear is the only way to fly.
C. Ludwig is offline  
Old 07-03-06, 04:22 PM
  #5  
Full Member
iTrader: (2)
 
its66's Avatar
 
Join Date: Oct 2004
Location: central fl
Posts: 131
Received 2 Likes on 2 Posts
DF,
The .756 with the 5.12 will work at Daytona. Good on both config's of Sebring also. If you have a 4.88, the 5th gear is even more critical to have the .756
its66 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
rgordon1979
3rd Generation Specific (1993-2002)
39
12-27-17 10:09 AM
The1Sun
1st Generation Specific (1979-1985)
7
09-18-15 07:13 PM
The1Sun
New Member RX-7 Technical
5
09-15-15 04:45 PM
sinistersam
New Member RX-7 Technical
5
09-13-15 07:17 PM


Thread Tools
Search this Thread
Quick Reply: 5th gear change out


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: