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Click on image for the lowdown. 
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10 members (Gdads51, JW51, Lightholder's Dad, Otto Skorzeny, MickeyP, FAST55, dt235sd, Pre '68 Dave, Peggy M, 1 invisible),
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Global Mod,
Mod | | | Forums66 Topics128,049 Posts1,055,652 Members48,426 | | 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: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | If I remember right the vacuum switch on the trans has 4 lines attached to it...Main Vacuum Supply, Hi to the rear, Lo to the rear and small line to the speedometer reduction unit. I've had a few of these vacuum switches apart over the years and most of them were heavily corroded inside. The housing is pot metal and collects moisture causing it to corrode and fail. Mike B  | | |
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