I am about to swap the fluids in my 4runner and i was just wanting some opinions on what is the best replacement oil for the rear end?

 

i put red line 75w90 synthetic awhile ago and it's been great

 

Amoil,Mobil 1,red line, which ever you get the better deal on.I run all amsoil in the gear boxes and diffs. Mobil 1 in the engine,only because of the deal I get on the engine oil.

 

okay thanks... it looks like i am going to use the red line... whats a good weight for the transmission oil??? i have 145k on the original trans...

 

5 spd i use the mt90

 

You may want to put some info about your rig in your signature so we know what you have. If yours is a 5 speed, mt90 would be a good choice, but an automatic will take Dexron 2 or higher (or an equivalent like Amsoil Universal Synthetic ATF which I use).

I run Royal Purple synth 75w90 in my diffs and t-case and it's good. I got a good deal on that brand so I went with it, but like the others said, Mobil 1, Amsoil, Redline, are all very good synth oils. I don't think the brand matters much as long as it's a well-known brand, not cheap generic oil. I like synth oil because the service interval is longer and I don't really think changing fluids is fun, so the less I have to do it the better.