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Re: Got a 6.2 diseasal... should I put a 700r4 or a Turbo400 behind it?
There's more to an overdrive transmission than fuel economy. Running your diesel at a lower rpm on the hiway will make it a happier motor. My '85 Jimmy came with a 6.2/700r4 combo and as far as I can tell everything is original and doing just fine. I have had a good many of these trucks and never broke 20 mpg w/o overdrive. My Jimmy now has 3/4t axles,35" tires,and 4.10s. It gets 22+mpg. my '91 Suburban that the axles and tires came off of got 22mph hiway with 6.2/4L80E. Al I know is these things love rolling all day long on the hiway in O/D,just like a big rig. My first 6.2 was an '84 K30 make in the '80s. I added a Banks Sidewinder kit and Gear Vendors to it and it also was 4.10 w/35" tires. I think that's a great combo for these motors. I think about 33" tires would be ideal.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"
GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim
"Don't call me a redneck. I'm a rough cut country gentleman"
R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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