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Re: Difference in Hiway RPM-3.73 to 3.42
Not to long ago I changed from a 3.42 to a 3.73 in my 1994 truck. Has a 4L60E and larger than stock 32" tires. I did the rebuild because the rearend gears failed. Was hoping the lower gears would increase milage as the trans went in and out of OD a lot. Milage is the same, the OD hunting issue is gone and it feels a bit better around town. Highway rpm went up about 100 RPM.
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