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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,009 Posts1,055,293 Members48,419 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I will not attempt to identify the year of an SM420 transmission. Here is general information: http://www.novak-adapt.com/knowledge/sm420.htmDate code info here (after you narrow down the years from info in the link above): http://members.cox.net/cglabe1/SM420/sm420.htmlAs stated above: "Fluid/lubricant goes into the u-joint housing from the transmission (if you still have the enclosed driveshaft)." That is also described in the Owner's Manual and/or Shop Manual. | | |
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