Quote:
Originally Posted by special-K
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.
|
Tim, that's a good point. The 6.2 isn't exactly known for its stout bottom end. Any revs you can take away from it make it a happier motor.