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Avizhome
Help identify R31 diff
#1
Home away from home
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2015/4/22 1:03
From Sydney, Australia
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Hi Guys,

I picked up a r31 diff recently, however not sure the type of it.

Can someone please help me identify it?

It has a 9-bolt rear cover and 6-bolt tailshaft flange

Thanks in advance :)

Kind regards
Ron

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Posted on: 2017/10/17 9:37
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ddgonzal
Re: Help identify R31 diff
#2
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From 48 North
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9-bolt cover is fairly unique - it is a Borg Warner 78. If it really came from an AUS-built R31, it could have either the 25 spline (R31 Pintara) or 28 spline (R31 Skyline) axles

You can confirm if the 3.89 ratio is still in there by examining the numbers stamped on the crown wheel (ring gear). Divide the two numbers

The 28-spline unit is rated for 320 ft. lb. torque, about what a 5.0 V8 puts out

Posted on: 2017/10/17 9:58
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Avizhome
Re: Help identify R31 diff
#3
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Thanks dd,

Is there a way to tell if it is a 28 spline or 25 spline??

Kind regards,
Ron

Posted on: 2017/10/17 10:04
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dattoman_1000
Re: Help identify R31 diff
#4
No life (a.k.a. DattoMaster)
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3.89 is the Skyline ratio... so should be 28

Posted on: 2017/10/17 12:00
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