Today I put the 4.38 R180 diff back in after converting it to a Limited Slip. I used a Nissan Motorsports 115mm 4 pinion clutch type LSD from Nissan Parts Warehouse. I had John at S.F. Differential shim it up for me to get the correct gear contact pattern. I removed my spare unit which is a welded 4.11 R160. The picture below shows the difference between the two. The R180 on the right is about 10lbs heavier than the R160 at 60lbs, and 1/2″ wider at about 7″ (depending on where you measure it). I have my CV joint adapters in place on the R180 while the R160 is wearing stubaxles. More info here
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