Differential

Alot. The driveshafts are considered to be the weak point.

R180's and R200's with 3.364:1 gearing came in:

240 - 260 Z's / 1970 to 1974 - R180
280ZX 6/78 - 9/79 - R200
280ZX Automatics and turbo's - R200
Maxima Sedans Automatics - R180
Ring gear is stamped with 37:11
Math tip... 37 divided by 11 is 3.3636

R180's and R200's with 3.545:1 gearing came in:

240Z - 280ZX Automatics - R180
280Z Manual - R200
280ZX Turbo w/Automatics - R200
Maxima Sedan Manual - R180
Ring gear is stamped with 39:11

R180's and R200's with 3.70:1 gearing came in:

810 Sedan - R180
280ZX Manual from 6/78 to 6/79 - R200
300ZX Non-Turbo and Turbo's - R200
Ring gear is stamped with 37:10

300ZX Turbo only 1987-1989

R200 3.70:1 LSD Viscous

300ZX Turbo Only 1988 Cars are all White. Diff is Labeled.

When checking the stamp on the ring rear, if you don't have 20/20 vision, bring a magnifying glass. It really isn't easy to read. Also have a flashlight and some steel wool... just in case ya need to do a bit of cleaning. A shop rag is required as well.

The R230 is a much beefier differential (230mm ring gear) available in a Viscous (fluid) limited slip. These can be found on Z32 (90-96 300ZX) and the Infiniti Q45.

To fit into the 1st gen Z:

• Redrill the mustache bar (MB) to accept the wider stud offset of the R230.
• Remove the top washers from the MB to place the diff higher to clear the lower control arm.
• Cut the cross brace to the rear of the diff (cut between the lower control arm mounts) and weld in a new brace above where the old one was (pull the pic from my yahoo site for clarification) cut the front (original diff mount) cross member so that just the mounting 'cups' for the lower control arms remain.
• Fabricate a new mount to pick up the forward mounting holes on the R230. Fab this mount to bolt to where the original diff safety strap (rubber band thingy) was. (again a pic for clarity might be helpful here)
• Use the inner CV joints on both sides of the side shafts (discard the original R230 outer CVs)
• Have shafts shortened or new ones made (measurements will follow)
• Fabricate an adapter to allow the CV to bolt to the companion flange (will look somewhat like a wheel lug adapter)
• Get the original drive shaft (Q45) and have it shortened and the yolk for your gearbox choice attached to one end (the Q45 drive shaft has a 4 bolt hole flange on both ends).