| [GMCnet] Keeping an eye on your final drive. [message #330235] |
Thu, 22 March 2018 20:48  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma:
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Senior Member |
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The NEWES GMC is now 40 years old. And the final drive is certainly the most under maintained, important part of our coaches. Change that gear lube for two important reasons. 1 It was designed for a 4000lbs car. Not a 12,000lbs motorhome. It's overloaded. And only for the fact that GM over designed parts back then. The FD has done well for us. Get some fresh lube in there. And get the contaminates out. ( Note. Make sure you DO NOT plug the LITTLE vent hole in the cover. Talk to members here about that. And some cover gaskets are made wrong. ) 2 Examine the thicker material at the bottom of the cover, and case. The slightly gray material is normal ware. If you find shiny material. If that's the case. Further inspection, and remplacement may be required. I just change my lube. Had about 30,000 miles on the lube. Found some material in there that concerned me. So I pulled the FD to look at the pinion bearing race. As that's the bearing that seems to fail first. Race wasn't perfect. But good enough to keep running. So now the FD is back in for the trip to Tucson. And thank you to John Biwersi for loaning me his tool to get the FD seal back in without damage. So if your interested in a 3:21 FD. Or repair. John's the pro on the 3:21. Bob Dunahugh
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