I'm wondering what speed people are going at what RPM. today i hauled a 35' 5er weighing in around 15000lb. and i was paying real close attention to my speed vs rpm.i didn't use OD while towing.2nd gear was 40 mph at 2700 rpm.3 locked was 55 at 2000. in od i turn about 1700 ish and go 67ish. i'm starting to think i don't have the 3.55 gear the sticker on the glove box says i do.thought and imput would be great.

With the 35's on my truck and the 3.54 gears I'm at 1250 RPM in OD at 55MPH. I think it was around 1600 at 70MPH but I am not on the interstate going those speeds very much so I don't remember for sure.

77mph(gps) @~2000rpm 6th gear 4:10 315/75r16