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Mod | | | Forums66 Topics128,196 Posts1,057,393 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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| | | | Joined: Nov 2016 Posts: 10 'Bolter | | 'Bolter Joined: Nov 2016 Posts: 10 | I work on new cars, so this modern gear oil was free and available when I drained and refilled the old '65's granny four speed. Should I change it to old school 90w gear oil? Something about the synchros not working correctly? It does grind sometimes in 4th if you get a little impatient with shifting, but I thought it was just the regular high mileage wear and tear. Pic of Ol Blue:  [img] https://s6.postimg.cc/xd6uy3iy9/image.jpg[/img]
Last edited by shp4man; 09/03/2018 3:51 PM.
| | | | | Joined: Feb 2004 Posts: 29,886 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,886 | The gears in a SM 420 are big, heavy, and have a lot of inertia. A lubricant as slippery as synthetic gear lube is probably keeping the synchronizers from doing their job properly. Rice rockets with transmissions that would fit in a back pocket and gears that weigh a fraction of what's in a real transmission don't have that kind of inertia to deal with. Some people also think the new water-thin synthetic motor oils are OK to run in stovebolt engines- - - -WRONG!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2007 Posts: 393 'Bolter | | 'Bolter Joined: Sep 2007 Posts: 393 |
It's a small world, but I wouldn't want to paint it.
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