I just checked today and (with the OD disengaged) I am running 52 mph at 2000 rpm's. Can anyone tell me which rear end is in my truck??<br><br>Thanks<br>Grampaw

 

I would guess to say 3:54's. In OD on mine, I'm running about 70 at 2000. I have 3:54's.

 

I have 3.54 in mine, that's about what my RPMs are at going that speed. I would say you have a 3.54 -- Mine had a plate bolted on it that said 3.54 as well, might check to see if you have one of those.<br><br>Tony

 

yeah there is a plate on there that says 3.54 or 4.10, or is it stamped on the thing.........I hate it when I can't remember.<br>Chase

 

http://phantomcycle.com/speed.html

A chart that I use and I use a GPS for speed readings since my speedo is off by 2-3 mph...And rpm gauges and be off a little too....but your close to my findings so I would guess you have 3:55 gears

 

Thanks to all. Knew I could get an answer. I'll check for the tag.<br><br>Grampaw