February 14th, 2022, 09:53 PM
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Senior Member
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 430
Thanks: 8
Thanked 8 Times in 7 Posts
Rep Power: 196
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Re: Drivetrain noise
Quote:
Originally Posted by James
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I've always been told that GL4 is used for gearboxes with brass synchro's and GL5 is harsh on said parts. I have GL5 in the rear axle. I'll have to change the oil anyway, will look into it.
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