I bought my 03 ram used, and I do some towing with it. My question is how do I know what gears I have. At about 70 the rpm are at 2,000, and what would be the recommended size to put in there. I have heard of people puting 4.56.

 

Open your glove box. There is a sticker in there and axle ratio is typed on there.
3:92 is the norm if it came from the factory with 20's.

Changing gears is your coice, but I don't think you'll have any trouble towing anything with the factory gears.
I tow a 8,000 pound boat with the 3:92's.

 

Get me the last 8 digits of your VIN and I can tell you what gear ratio your truck has...

 

it has the stock 17'. My boat is about 2500-3000 and it seems to be lugging up small hills.

 

Do you have the 4.7 or 5.7?

Both engines should pull 3k with ease.

 

its the 4.7
I just went outside and checked. They are 3.92. I live in South MS and there are not many hills around here but I didnt like the rpms when I was towing with O/D off on the interstate. With O/D on it was shifting too much. I guess there isnt enough torque that low in the rpm range to keep it at 65-70

 

get jet chip stage 2, I have heard that these fix that problem.

 

A lot of the 4.7 guys change to 4:10 and seem to be very pleased with the results.

I also think a programmer with tow mode will help. Especially with the shifting.

 

I got 4.56 in my 4.7

 

oe....where did you get your gears and how much? did you do it yourself or pay for it? if paid how much for install thanks.