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BA/BF Diff Ratios 

 

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 Post subject: BA/BF Diff Ratios
Posted: Sun Sep 23, 2007 4:48 pm 
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Just trying to get a list together of the different diff ratios that ba bf have.
including model,year and ratio

 

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Posted: Sun Sep 23, 2007 9:05 pm 
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xr6 turbo and xr8 ba 4 speed autos are 31 spline 3.46

 

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Posted: Sun Sep 23, 2007 10:33 pm 
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BA Lane is 3.45.
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Posted: Sun Sep 23, 2007 11:53 pm 
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Diitto on the XR6 and I'm 99% my 2003 XT is a 3.08.

 

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Posted: Mon Sep 24, 2007 10:46 pm 
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All BF/BF2's with the 6 speed ZF auto get a 2.73 rear end.

I'm getting mine swapped tomorrow for a 3.45 with a tight rebuilt LSD. :D

 

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Posted: Mon Sep 24, 2007 10:50 pm 
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data_mine wrote:
All BF/BF2's with the 6 speed ZF auto get a 2.73 rear end.

I'm getting mine swapped tomorrow for a 3.45 with a tight rebuilt LSD. :D


Oh that sounds like so much fun.... do please update when its done! and video :D

 

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Posted: Mon Sep 24, 2007 11:09 pm 
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I believe the 5 speed manual BA's got a 3.23.

 

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Posted: Tue Sep 25, 2007 2:01 pm 
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and the 6 spd manuals have a 3.7 afaik

 

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Posted: Tue Sep 25, 2007 2:02 pm 
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BF Typhoon, 6speed 3.73 diff

 

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Posted: Tue Sep 25, 2007 10:07 pm 
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MR XR wrote:
data_mine wrote:
All BF/BF2's with the 6 speed ZF auto get a 2.73 rear end.

I'm getting mine swapped tomorrow for a 3.45 with a tight rebuilt LSD. :D


Oh that sounds like so much fun.... do please update when its done! and video :D


Of F@#$ yeah!

3.08 to 3.45 on my EL was a great improvement, and so is this on my GT-P.

I'll have to organise some 1/4 times. But just around town it's so much more responsive. The ZF seems to have adjusted fine to it. It's not hitting the limiter before changing, and speeds/revs where previously 6th was locked out, are now available. Smart box.

 

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1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow - 97.5rwkw
2006 BF GT-P in Ego, mods. 293rwkw - 12.427@109 - 0-1000m 24.838@221

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Posted: Wed Sep 26, 2007 12:22 am 
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XR6T, XR8 & FPV are 31 spline

All others are 28 spline

 

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Posted: Wed Sep 26, 2007 12:38 am 
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6T, XR8, and FPVs get a Borg Warner M86 diff, the rest a Borg Warner M78

So gears aren't swappable between them, and the LSD (standard on the 86, optional on the 78) are done differently. One with clutches, the other cones. I can't remember which way is which.

 

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1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow - 97.5rwkw
2006 BF GT-P in Ego, mods. 293rwkw - 12.427@109 - 0-1000m 24.838@221

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Posted: Wed Sep 26, 2007 10:19 pm 
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Clutches are in the M86.
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Posted: Sat Nov 17, 2007 11:28 pm 
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don't know about the rest but ba 2003 xl ute the only ratio's offered to me on the build sheet were 3.23 or 3.45
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Posted: Sun Nov 18, 2007 12:02 pm 
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Mr Man wrote:
and the 6 spd manuals have a 3.7 afaik


confirmed.

 

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