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Re: 1989 Suburban with 5.3LS/700R4
Quote:
Originally Posted by 2ndGenRR
I don't know...never got the chance to check it after the gear swap. Prior owner claimed he was getting close to 20mpg...which I'm skeptical about. I would guess closer to 16-17mpg.
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That 20 mpg figure would easily be possible at 55 mph. After between 60-65 mph, these boxy trucks start to really suck fuel. On my old 1982 Suburban with the 6.2 diesel, I would lose 9 mpg driving 75 mph vs 60 mph.
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1990 ¾ ton 4x4 Chevy Suburban
-Cummins Diesel - 12 valve - factory rebuilt
-6 speed bullet proof manual transmission - NV5600
-Gear Vendors Overdrive - HX35 Holset Turbo
-NP205 iron transfer case
-3.73 gears -2" Lift
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