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- - Gear Oil For Rear Diffs?? (https://www.classadrivers.com/forum/new-truck-drivers-get-help-here/33410-gear-oil-rear-diffs.html)

tcr1016

04-10-2008 03:37 PM

Gear Oil For Rear Diffs??

What weight and oil manufacture do you use for the rear differentials? I need a good oil, but prefer not to use synthetic.

Sealord

04-11-2008 12:30 AM

Gear Lube

Isn't gear lube 90 weight? BOL

heavyhaulerss

04-11-2008 12:45 AM

I USE THE JT-7 90/140

Copperhead

04-12-2008 09:58 AM

Most rears and trannys now use a 80w90 synthetic oil. Brand name not so important.

Kranky

04-13-2008 01:13 AM

We use 75W90 synthetic in the Meritor rears, and 50W synthetic in the Eaton Fuller transmissions.

We sample it yearly to keep an eye on it.

Even if the samples test OK, it gets changed every 200,000 miles.

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