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Mod | | | Forums66 Topics128,206 Posts1,057,435 Members48,471 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Okey Dokey, gonna write the last chapter of this novel..
I drained out the Mobil Delvac Synthetic Manual Transmission fluid 50 and refilled with
Citgo, Mystik JT-7 85w-140 gear oil, which I've run in all of my rear ends and manual
transmissions for many decades now, and guess what................
NO MO GRINDING THE GEARS!!!!!
Old Bluebelle shifts like a new transmission again. I’ve driven it a few hundred miles
mostly around town since the switch just to prove out the difference and it shifts as
smooth as silk syncros working just as they should
So from my personal experiance with a brand new SM420 rebuld, stay away from the
synthetics in the gearbox and stick with the old tried and true multigrade gear oils.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
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