700r4 install

[jfalesi]

I use a spreadsheet to calculate engine spd vs. RPM for various combinations of trannys and rear ends, but I never checked 4.11 with a 700r4. Should be OK, seeing as how it's not that much taller than a 3.73. Your cruising RPM at 70-75 would probably be around 2500 RPM or so, which isn't great but is a lot better than your 3-spd. I don't know how it would effect your first gear. Give me your gear ratios and I'll do some calculations.

If you want to stay with the 3-spd, you'd probably be fine with a 3.73 or even a 3.42 depending on your gear ratios. Of course, a synchro would be nice too...

Originally Posted by Simbone47

Not sure how gas mileage became the topic. That was never the issue or I wouldn't be driving an old truck. It's about usability. I'd like to be able to operate on the highway. Again, I worry that a simple rear end change will affect my low speed performance, since I don't always have access to downshift to first, this will create a different problem for me. Anyway guys thanks for all the comments.
Chris