So I bought a 99 2500 v10 automatic 4x4 a few months ago. I owned a 2000 v10 3500 automatic 2wd about 10 years ago (and I kicked my self in the butt ever since for selling it). I noticed with this 99 it doesn’t seem to have the pulling power that the 2000 had. With the 2000 I could pull my kubbota 80mph all day long no problem. The 99 won’t do it. The one big thing I noticed is that the 99 seems like it’s a 5 speed auto. I know it’s suppsoed to be the 47re 4 speed but it’s not acting like it. Is there something I am missing here because I do not recall the 2000 being this way nor have I ever seen a 2nd gen act like that.

According to the build sheets both trucks came with 3.55s. I can’t remember what size the tires are. They are either 275 or 285. I have considered changing gear ratios but I don’t know what that will do to fuel mileage. I’m already averaging about 9mpg empty. In most cases going with a lower ratio gives you worse fuel mileage. I have seen it happen once before in a 70 Chevy 3/4 ton where we dropped it to 3.73 and the mileage and power actually improved. I think that more had to do with the weight of the truck and the factory gears being to small which caused to much strain on the motor to keep that tank going.