Rear end gear ratio change
#1
Rear end gear ratio change
I have a 2000xj8 with 260k miles and a front pinion bearing failing, very noisy and getting worse ... I decided because of the work involved and expense to set up the rear end aga8n after a bearing replacement to get a different lower mileage 3rd member
I purchased a 1998 XJR positraction t9 install and I am now learning this may be a problem for the computer as a result of this speed change
If I’m correct my XJ8 has a 3.08:1 ratio and the replacement from the XJR is a 3.31:1
The computer may see the difference at the trans output sensor compaired to the abs
If true is there a work around besides a mention Unit f9r and by Ford
Thank you
Christopher
Washington State
chrissuperguy@yahoo.com
I purchased a 1998 XJR positraction t9 install and I am now learning this may be a problem for the computer as a result of this speed change
If I’m correct my XJ8 has a 3.08:1 ratio and the replacement from the XJR is a 3.31:1
The computer may see the difference at the trans output sensor compaired to the abs
If true is there a work around besides a mention Unit f9r and by Ford
Thank you
Christopher
Washington State
chrissuperguy@yahoo.com
#2
I have a 2000xj8 with 260k miles and a front pinion bearing failing, very noisy and getting worse ... I decided because of the work involved and expense to set up the rear end aga8n after a bearing replacement to get a different lower mileage 3rd member
I purchased a 1998 XJR positraction t9 install and I am now learning this may be a problem for the computer as a result of this speed change
If I’m correct my XJ8 has a 3.08:1 ratio and the replacement from the XJR is a 3.31:1
The computer may see the difference at the trans output sensor compaired to the abs
If true is there a work around besides a mention Unit f9r and by Ford
Thank you
Christopher
Washington State
chrissuperguy@yahoo.com
I purchased a 1998 XJR positraction t9 install and I am now learning this may be a problem for the computer as a result of this speed change
If I’m correct my XJ8 has a 3.08:1 ratio and the replacement from the XJR is a 3.31:1
The computer may see the difference at the trans output sensor compaired to the abs
If true is there a work around besides a mention Unit f9r and by Ford
Thank you
Christopher
Washington State
chrissuperguy@yahoo.com
Anyways, if you went with a different gearing, then a method to get around the TCU is to put in different abs tone ring. But I believe you should be good since they're the same differential.
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