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Location:
Brisbane
Registered:
November 2002
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F-series gear ratio interchangeability???
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Sat, 11 October 2003 09:02
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Hi guys.
I have a live axle F-series diff with a 3.9 ratio.
I have an IRS F-series diff with a 3.5 ratio.
I would like to fit the 3.5 ratio to my existing diff.
I have been told that it should just go straight in.
I have been told that the pinion is different on the IRS but that you can do something to make it work.
I have also been told that there's no way it will ever work.
Does anyone know if it can be done, or what needs to be done?
Do you even have to change the pinion if you change the ratio - or can you just have them lapped together?
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: F-series gear ratio interchangeability???
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Sat, 11 October 2003 11:39
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from my experences i have only taken out a lsd from an irs and put it into a live rear end ,but i say they would be the same length as in pinion length better to find a ms55 live center and change that so you can just bolt center in
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Location:
Brisbane
Registered:
November 2002
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Re: F-series gear ratio interchangeability???
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Sat, 11 October 2003 22:36
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I know that the centres can be changed, that has been proven.
I need to know if the ring & pinion can be swapped.
The reason I am using the IRS diff is that, as far as I am aware, the manual RA65 is the only source of 3.5:1 F-series diff gears.
I will look up the MS55 now though...
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Location:
Melbourne
Registered:
May 2002
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Re: F-series gear ratio interchangeability???
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Sun, 12 October 2003 23:00
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well i can tell you i fitted a 4.1 LSD ma61 ring/pinion into a modified ms112 crown solid axle - so i can tell you it does fit!!
T
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Location:
Brisbane
Registered:
November 2002
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Re: F-series gear ratio interchangeability???
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Thu, 16 October 2003 09:01
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Thanks for your response T.
Did the crown wheel and pinion go straight in - only reason I ask is that you said "modified axle"
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Location:
Melbourne
Registered:
May 2002
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Re: F-series gear ratio interchangeability???
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Fri, 17 October 2003 00:30
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i shortened the axles and diff housing 12mm each side so it fitteed under the ae86's rear.
ma60 is irs housing, so you have to swap the "guts" into the rwd diff housing/nose too.
T
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