I recently purchased a 27'RBS Jayco Jayflight that is a little bit heavier than I thought it was when I was looking at it, it weighs around 8k fully loaded. My problem is that I have 33" Procomp Extreme AT's and the stock 3.55 gears. As you could geuss going uphills makes my truck seem like a dog, and there a lot of hills here in easterh Kentucky. I have the edge and banks monster exhaust. I used to have the volant cai, but the drone drove me crazy so I sold it. I know that I could go with another cai and some custom tunes, but I think that my best option, besides trade for a 250 which I hate to do b/c I don't tow everyday and I like the 150 ride, would be to swap gears to something like 4.10's or 4.30's. I have searched but I really havent found a solid answer to my question. I was just wondering what some of you guys think.

 

With 33's and towing I would have to go with 4.56 over 4.30

 

I thought about that. But this is my dd and I do a lot of highway driving going to work. I only tow prob 15 times a year. I dont want my mpg's to suffer a whole lot when I am driving to work, since I put on around 16000 miles a year, that will eventually add up.

 

4:10's

 

If you don't plan on getting bigger tires, go with 4.10's or 4.30's. The FX4 trucks come with 32" tall tires and 3.73 gears, so 4.10's and 33's will get you a bit lower gear ratio than a stock FX4.
If you don't tow often I would not go with 4.56 and 33" tires. Especially around here, the hills aren't THAT big that you want to lose your mileage if you do lots of highway driving.

 

Ya I agree 4:56 is WWAAYYYY to much gear for a 33,