DIY - Limited Slip Differential Install

B&W_Evader

Disclaimer, these are my opinions and the way I did mine. Use this information at your own risk.

First off, just because your rear diff bushing leaked the fluid out of it does not mean it needs to be addressed immediately. If you your getting a knocking noise it does, otherwise you have time. I ran mine for about 6 weeks after noticing the leak (actually pointed out to me by a forum member) and found it to be still solid when I cut it out (what a pain BTW).

I finally received all the parts last week and started the install this past weekend. This turned out to be a bigger job than I expected but I think the worst is behind me. I don't have my notes with me so I'll be updating the thread over the next couple of days with pics and info.

Parts List:
OS Gicken (NS112-HA) Super Lock Limited Slip Differnetial - $1605.50 (Z1 Motorsports)
Z1 370Z/G37 Full Differential Upgrade Kit (w. Motul 75W140) - $290 (Z1 Motorsports)
...Energy Differential Bushings - DO NOT USE, requires modifications
OEM 370Z Differntial Output Shaft $176.32 (Z1 Motorsports) WRONG PART - DO NOT USE (Not OEM, Missing Threads)
... To use part, Mr Metric: 6x #M50202 @ .55 ea and 6x M41459 @ $1.64 ea, torque to 60 ft-lb due to grade 10.9
OEM Diff Side Bearing (38440-0C000) 2x for $97.96 (Z1 Motorsports)
OEM Diff Side Seal (38342-P9010) 2x for $19.96 (Z1 Motorsports)
OEM Diff LSD to Pinion Bolt Z33 10x for $26.60 (Concept Z Performance)
1x, 20692-65J00, $16.07 Mid Section Exhaust Gasket front (Capitol Nissan of San Jose)
2x, 20692-1E810, $11.99 ea Mid Section Exhaust Gaskets 2 rear (Capitol Nissan of San Jose)
4x, 08918-3401A, $1.67 ea exhaust nuts to replace damaged ones (Capitol Nissan of San Jose)

Special Tools:
Torque Wrench
17mm deep socket (2" dp, preferably 1/2" drive)
Breaker bar
Indicator and Indicator mount for backlash measurement

Torque Specs (updated)
Ring Gear 58 ft-lbs +31to36 deg (some threads say use threadlocker, Nissan spec didn't mention it, old ones where clean, I left them clean)
Diff Cover 44 ft-lb
Diff Cover Plugs 35 ft-lbs
Half-Shaft (Diff side) 59 ft-lbs
Drive Shaft 55 ft-lbs
Fill plugs - 26 ft lbs
Front mount bolts - 74 ft - lbs
Rear cover stud - 81 ft - lbs
Bearing cap - 69 ft lbs


Basic order of operation:
Remove Cross Brace
Remove Mid section of exhaust
Remove Sway Bar
Disconnect Half-Shaft Sensors
Drain Oil
Mark and disconnect half shafts
Disconnect Drive Shaft
Remove Differential
Check Backlash
Swap LSD
Reverse order for install

Thanks for the support:
Jon at OS Giken for great support and super fast email responses
Jon&Joel at Z1 Motorsports
Capital Nissan of San Jose for torque specs, took forever but they came through

Attached Images

Start_01.jpg (148.8 KB, 329 views)

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