Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Race Car Tech
Reload this Page >

Where to get a High rear gear ratio for FB

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

Where to get a High rear gear ratio for FB

Old 09-29-10, 12:53 AM
  #1  
BUY MY PARTS!!!
10 Year Member
Thread Starter
iTrader: (5)
 
Electronblue's Avatar
 
Join Date: Nov 2004
Location: Blacksburg, VA
Posts: 428
Likes: 0
Received 0 Likes on 0 Posts
Where to get a High rear gear ratio for FB

Looking for a Longer ratio rear ring and pinion for my 85 GSL.

Im currently running a Chevy 5.7LT1 and a Chevy T5U 5 speed tranny, and my gearing is awful. Rear ratio is stock (3.933 iirc)

First gear is worthless, and 5th gear at 70 is like 3k rpm (would be fine on a rotary, but not so great on a chevy v8)

My rear diff is about to blow anyways (car is lowered and my pinion has gone) so its time to fix it.

I know there are TONS of Shorter gear ratios available- all the Miata 1.8 and later RX-7 stuff, but none of those are slower ratios.

This is an XP autocross car, so not having to shift to 3rd all the time, and being able to pull out in 1st would be a plus

Any help would be appreciated. Also, I think the stock Camaro had around a 3.4 final.
Electronblue is offline  
Old 09-29-10, 06:54 AM
  #2  
Death to Infinite Scroll
 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 11,735
Received 45 Likes on 42 Posts
None available - adapt a different rearend.

You'll probably have to do this anyway. My latest failure of the Mazda rear is an interesting one - I bent the banjo where the dropout attaches. There's a 1/8" gap in the middle, now.
peejay is offline  
Old 09-29-10, 09:01 AM
  #3  
Mr. September FB 2011
5 Year Member
iTrader: (9)
 
nofords's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 489
Likes: 0
Received 0 Likes on 0 Posts
You are correct that some Camaro's came with 3:42 however, a cheaper/stronger alternative is to go with a ford 8.8 from a wide variety of cars and trucks. They come with disc brakes, 3:08, 3:55 and 3:73 gears, most with factory posi. They also use the 5x4.5 bolt pattern which matches the 5 bolt Rx7 pattern. Swap in 5bolt hubs (if you haven't already) to your GSL stubs and away you go!

You might get lucky and score one with a usable width.
nofords is offline  
Old 09-29-10, 07:55 PM
  #4  
BUY MY PARTS!!!
10 Year Member
Thread Starter
iTrader: (5)
 
Electronblue's Avatar
 
Join Date: Nov 2004
Location: Blacksburg, VA
Posts: 428
Likes: 0
Received 0 Likes on 0 Posts
yea, I've been looking at teh ford 8.8 for a long time now, just wanted to see if anyone had found something else to work yet.

Only thing that sucks about going to 5 lug is I will have to get another new set of wheels.



Can you give me some more info about swapping the fronts to a 5 lug? Keep the same caliper with a new rotor or what?
Electronblue is offline  
Old 09-29-10, 08:00 PM
  #5  
BUY MY PARTS!!!
10 Year Member
Thread Starter
iTrader: (5)
 
Electronblue's Avatar
 
Join Date: Nov 2004
Location: Blacksburg, VA
Posts: 428
Likes: 0
Received 0 Likes on 0 Posts
and I currently have all GLS-SE hubs/axles/brakes- just using the GSL Pinion/ring for the slightly longer gearing.
Electronblue is offline  
Old 09-29-10, 08:04 PM
  #6  
E85+Boost+Rx2=zoom zoom
10 Year Member
iTrader: (2)
 
rex3's Avatar
 
Join Date: Oct 2004
Location: Long Island NY
Posts: 499
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Electronblue View Post
yea, I've been looking at teh ford 8.8 for a long time now, just wanted to see if anyone had found something else to work yet.

Only thing that sucks about going to 5 lug is I will have to get another new set of wheels.



Can you give me some more info about swapping the fronts to a 5 lug? Keep the same caliper with a new rotor or what?
When you get your new axles have them drill them to 4x110. I had that option when I got my axles from moser engineering.
rex3 is offline  
Old 09-29-10, 08:09 PM
  #7  
BUY MY PARTS!!!
10 Year Member
Thread Starter
iTrader: (5)
 
Electronblue's Avatar
 
Join Date: Nov 2004
Location: Blacksburg, VA
Posts: 428
Likes: 0
Received 0 Likes on 0 Posts
car is 4x114.3 now. but yea, Moser sells that for the shortened ford axle. How do you guys mount the axle- the grannys kit or go 4 link or what?
Electronblue is offline  
Old 10-01-10, 12:36 AM
  #8  
BUY MY PARTS!!!
10 Year Member
Thread Starter
iTrader: (5)
 
Electronblue's Avatar
 
Join Date: Nov 2004
Location: Blacksburg, VA
Posts: 428
Likes: 0
Received 0 Likes on 0 Posts
any other help?
Electronblue is offline  
Old 10-03-10, 04:55 PM
  #9  
Death to Infinite Scroll
 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 11,735
Received 45 Likes on 42 Posts
Originally Posted by nofords View Post
You are correct that some Camaro's came with 3:42 however, a cheaper/stronger alternative is to go with a ford 8.8 from a wide variety of cars and trucks. They come with disc brakes, 3:08, 3:55 and 3:73 gears, most with factory posi.

I can with 100% certainty guarantee you that no Ford ever came with a Posi.

And IBM doesn't sell Xerox machines either!
peejay is offline  
Old 10-04-10, 10:21 AM
  #10  
Mr. September FB 2011
5 Year Member
iTrader: (9)
 
nofords's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 489
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by peejay View Post
I can with 100% certainty guarantee you that no Ford ever came with a Posi.

And IBM doesn't sell Xerox machines either!
Limited slip then...better?
nofords is offline  
Old 10-06-10, 04:09 PM
  #11  
I only have 1.3liters
10 Year Member
iTrader: (2)
 
85rx-7gsl-se's Avatar
 
Join Date: Mar 2006
Location: Manchester, TN
Posts: 816
Likes: 0
Received 0 Likes on 0 Posts
Specs on the wheels and tires you are running? Just wanting a comparison to the setup I am running on my SSM FB.
85rx-7gsl-se is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
FD7KiD
3rd Generation Specific (1993-2002)
14
06-19-19 02:57 PM
mustanghammer
Race Car Tech
28
11-22-15 07:10 AM
CaptainKRM
2nd Generation Specific (1986-1992)
14
08-26-15 09:52 PM
FD7KiD
Single Turbo RX-7's
1
08-17-15 11:50 PM


Thread Tools
Search this Thread
Quick Reply: Where to get a High rear gear ratio for FB


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: