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Go Back Forums > 66-77 Ford Bronco > Bronco Tech

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Old 04/17/19, 01:37 PM   #16
Bronco Guru
deltabronco's Avatar
Wake Forest NC
Joined: Dec 05
Posts: 1,015
Originally Posted by PaveBronco View Post
Do you know what type of gear lube you're using, when I first brought my Bronco it whined, turned out the gear lube was the wrong type, way too thick. Rebuilt it many years later and learned about some gear oil has an additive that will eat your copper/brass??? bushings...
90 wt gear oil

Andy P.
76 lubr
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Old 04/17/19, 06:52 PM   #17
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Posts: 1,566
Ford calls for 50W oil - I've had no issue using that.
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Old 04/17/19, 08:01 PM   #18
Total hack
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Adapt and overcome

Maricopa, AZ
Joined: Jun 02
Posts: 29,716
50wt motor oil is the same as 90wt gear oil. They are different scales.

"She's built like a steakhouse but she handles like a bistro"-Zapp Brannigan
Why do people keep expecting "normal" from me?
Full throttle, it either solves the problem or ends the suspense.
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Old 04/17/19, 08:23 PM   #19
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San Jose, CA
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Posts: 34,460
I've read that fact time and time again for the last 25 years and still can't wrap my head around the real-world aspects.
Try to drain a quart of 50w motor oil and a quart of 90w gear lube and they sure don't act the same that way.
Same for using one of the good old Sta-Lube pumps. Man, pumping 90wt into a gearbox makes you think you just went a few rounds with the champ. Doing the same with either 50wt or even synthetic 75w/90 gear lube is not even in the same arena.

I guess there's enough spin inside the case to throw even cold 90w lube up into the output shaft section and keep the bearings lubed. But I always worried about that.
So I'm still going to use thinner gear lubes or the 50wt.


'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"
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