Difference in Hiway RPM-3.73 to 3.42

[americanmusc1e]

If you are going to want to swap in an OD trans at some point, you'll want the 3.73's. I had 3.08's and a 700r4 and overdrive wasn't viable below 70mph.

If you don't plan on going to an OD trans, 3.08's don't do too bad in these trucks. Chances are, you could find a complete 3.08 rear end because a good portion of the automatic trucks were 3.08

I run 3.08's in my truck currently. I have a TH400 in it now and was debating swapping to a 4L80E, but for as little as I drive it, the 3.08's will do. They are NOT as nice on the highway as an OD trans with lockup, but they are tolerable. It's also easy for me to remember to let up after the 2-3 shift because the truck shifts out of second gear at 90. and I don't care to go faster than that.