Subaru R180 diff in Nissan case

Engine, Transmission and related drivetrain.
Post Reply
iceman510
Posts: 87
Joined: 27 Jul 2015 19:05
Location: Howell, MI

Subaru R180 diff in Nissan case

Post by iceman510 » 12 Jun 2019 06:51

Hey all, I hope someone out there has done this and can chime in. I acquired an R180 Subaru CLSD unit bare, and I am looking to put it in my Nissan 720 truck housing with the 4.38 ring and pinion. It is the K housing, so I am thinking this should fit. This installation shouldn't really be any different than doing an aftermarket diff installation basically, right?

I have compared and measured the two, and within my capability and tool accuracy of measuring I see about a 0.5 mm difference in the ring gear mounting surface to bearing outer case dimensions (measured both directions). I am thinking this should be within the scope of adjusting with the side case shims.

I plan to use the matching ring and pinion from the truck. Any advice on pitfalls for recommendations appreciated. Photos below. Thanks in advance.
Attachments
subi diff small.jpg
Subie clutch diff
subi diff small.jpg (176.5 KiB) Viewed 155 times

iceman510
Posts: 87
Joined: 27 Jul 2015 19:05
Location: Howell, MI

Re: Subaru R180 diff in Nissan case

Post by iceman510 » 12 Jun 2019 06:56

Hmmm, dropped two pictures for some reason.
The attachment datsun _subi diff small.jpg is no longer available
The attachment datsun _subi diff small.jpg is no longer available
Attachments
datsun _subi diff small.jpg
datsun _subi diff small.jpg (208.82 KiB) Viewed 153 times

User avatar
funwithmonkeys
Supporter
Posts: 1081
Joined: 05 Sep 2013 09:34
Location: Vancouver, BC

Re: Subaru R180 diff in Nissan case

Post by funwithmonkeys » 12 Jun 2019 11:53

I found out the hard way that there are 2 different ring gear sizes. The older Nissan ones are 110mm ID and the newer ones are 115mm ID.
If no one from the future comes back to stop you from doing it then how bad of a decision can it really be?

iceman510
Posts: 87
Joined: 27 Jul 2015 19:05
Location: Howell, MI

Re: Subaru R180 diff in Nissan case

Post by iceman510 » 12 Jun 2019 12:32

I didn't check that yet, but I need to to make sure. Truck unit is a considered the newer type I believe, so it should match.

User avatar
JordanTr
Posts: 895
Joined: 20 Feb 2013 22:27
Location: Langley, BC, Canada

Re: Subaru R180 diff in Nissan case

Post by JordanTr » 13 Jun 2019 08:37

funwithmonkeys wrote:
12 Jun 2019 11:53
I found out the hard way that there are 2 different ring gear sizes. The older Nissan ones are 110mm ID and the newer ones are 115mm ID.
Do the bolt PCDs line up still? Could always do some machining to make it work if that’s the only issue.
Jordan | '72 2 door KA project | '94 240sx RB26DETT | '97 Silvia RB25DET | '90 Audi 90 Quattro 20V (DD)

User avatar
funwithmonkeys
Supporter
Posts: 1081
Joined: 05 Sep 2013 09:34
Location: Vancouver, BC

Re: Subaru R180 diff in Nissan case

Post by funwithmonkeys » 13 Jun 2019 08:40

From what I understand the bolt pattern is the same. I just got the Cusco LSD to fit the 110mm ring gear.
If no one from the future comes back to stop you from doing it then how bad of a decision can it really be?

Post Reply