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Re: What kind of MPG's are you guys getting?
I got between 17-18 in my '69 Suburban with a 5.3/4L60E and 3.08 gears and 31x9.5-15 tires. I initially figured I'd be in the low 20's, but it was lower due to the high gears. At 55-60 mph it only ran at about 1300-1400 RPM. That was too low to make any reasonable torque, so the engine was working too hard and using too much fuel. With 3.73 gears, you can run 60-65 at 1700-1800 RPM, which would be perfect for cruising power and could probably get into the low 20's on the highway.
Either way, I didn't regret the swap. I actually kept the motor when I sold the Burb so that I can use it in my '57!!
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