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rear axle gear oil weight

80K views 10 replies 7 participants last post by  lifestroker97 
#1 ·
I'm puttin a new diff. cover on my 97 f350.
i'm reading/hearing a mix between 75W-140 and 80W-90
idk which one it is.
anyone know?
 
#5 ·
Bingo...get two or three cans of brake cleaner too...get all the bs metal outta the pumpkin.

There is a tag captive to the diff cover bolts that says 75w-140 Synthetic

I know that the front calls for different stuff buuuuut I use the same in both ends...I use RP and even though their stuff isnt considered good anymore I use it because I tried one of the 'good' ones and it sucked. Made it about four months and I couldnt take the noise, clunking and performance anymore. Went back to rp and all those issues disappeared...

Fwiw, mobil 1 makes a good syn gear oil in this weight. Cheaper than RP.
 
#6 ·
thanks guys.
i think i'm gonna run AMSOIL in the rear end.
i just fixed a fuel leak earlier this morning and was checkin all the lines when i found a pin hole in the diff cover so for now it's just the rear but i'll take care of the front diff before this winter.
any other comments on brand of oil? just to get a feel for what other guys are runnin.
 
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