Well I finally changed the Diff.'s to 4:88's from 4:56's. I didn't have a real big choice but to change them. Last Sat. the rear started singing to me about 1/4 way thru a 120 mile trip. I got from a friend a rear 4:88 carrier he had removed from his 4runner to put in and arb set-up for $100.00 and I got the complete front from a local junk yard for $200.00. Changed the rear yesterday am and the front today. Seems to have better take off and takes the hills better but I see no difference in rpm's at different speeds. I wrote down different rpms at different speeds before the change. At the most there may be about 25 rpm difference.
At least the gear whine is gone. LOl

 

nice, i hope to be going to 4.88s this summer from 4.10s. I cant wait untill i have enough money.

 

I love having 4:88's from the factory hehe sorry i couldn't help myself

 

Your engine is turning 7% more RPM with 4.88s than 4.56s.

4.88s with an ARB sounds like a nice setup!