My 70 240Z had a 5 speed and R200 diff from an 82 280ZX installed a year ago. Was noticing a lot of whining, and other noises coming out of the rear end. Was figuring a rebuild on the diff (as it is still over 25 years old). Decided to look into getting different gear oil to see if that will quiet the noise down. Couldn't get my hands on any Red Line in a quick manner, so went to Napa and got some Royal Purple 75W140 synthetic gear oil. Figured that the thicker oil might quiet things down, and it would be a cheap alternative to a rebuild! Just finished driving it around and I can't believe the difference the 75W140 makes over whatever standard oil I had before! Would highly recommend it for anyone with similar problems! Of course, here in AZ the thicker gear oil probably makes sense anyway!!

RP, as well as Redline, provides drastic improvement over standard lubricants. I use RP in engine, tranny and R180. Excellent products.

Frank

So thats great, I have some Redline 75w-90 for the tranny, and I will pick up some 75w-140 for the rear end. I am a huge fan of Royal Purple products and noticed a difference in my Subarus over Mobile 1 even.

d240zx2, I did not mention it, but I have some of those slotted mags sitting in my garage I would be more than willing to part with since I will never replace my panasports. If you need another set, let me know, you can have them for any reasonable offer.