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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,051 Posts1,055,714 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!
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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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I agree with Evan's statements (my comments/additions are in brackets/braces, below):
"That is right in the range one expects from your truck. A set of 3.55 gears for the rear end should boost it up to 14.5 to 15 mpg." [at 60 mph or less]
"Radial tires can gain at least 1 mpg. [adjust/play-with tire PSI to provide the best "balance" between steadiest/easiest steering]
Get 3.55 installation parts kit
- decrease oil leakage and looseness in parts.
- rear axle bearings often lower some noise.
Check, replace, adjust all front end/steering parts/seals - assemblies and alignment. | | |
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