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Click on image for the lowdown. 
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| | | Forums66 Topics128,083 Posts1,055,967 Members48,430 | | 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: Mar 2002 Posts: 553 Shop Shark | | Shop Shark Joined: Mar 2002 Posts: 553 | I too learned something this weekend. I'm putting another sm420 tranny in my truck. I always wondered why mine leaked gear lube in the bottom of the front. I found out that the threaded bottom mounting holes goes all the way through the housing. You gotta put some kind of sealant on the bottom two mounting bolts or it will always leak. | | |
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