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Click on image for the lowdown. 
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7 members (Gdads51, dt235sd, moparguy, Otto Skorzeny, tclederman, Jon G, 1 invisible),
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Global Mod,
Mod | | | Forums66 Topics128,094 Posts1,056,056 Members48,433 | | 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!
| | THANKS!
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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | Not only is the viscosity different but lubricant for the rear must have EP (Extreme Pressure) additives and these additives will attack the synchronizers in in a transmission. Engine oil can be used in a transmission. Especially spur type transmissions. Many people find synthetic oil in transmissions objectionable because it reduces the effort of the synchronizers. | | |
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