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Old 01-09-2018, 04:31 PM   #61
jdb_us1
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Join Date: Nov 2016
Location: Bernville PA
Posts: 61
Re: 1990 GMC crew cab build

Got the truck back today after having the rear gears changed to 3.73 from 4.10 and have noticed about a 200 rpm decrease at 50 mph. Havent gotten a good chance to really run any distance yet and just refueled to be able to monitor MPG's. The little bit I did drive I found that 2nd gear speed is now my slow speed crawl (putting in traffic) where i used to be able to lug it in third. I did try to drive some long steep hills (that I had not driven in the old configuration) and found that I was just able to keep up with traffic, which I am ok with. So now time to put some miles on and check the economy.
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1990 GMC CC LWB
1958 Chevy 3/4 ton flat bed
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