.32 and a little more grunt.

http://completeoffroad.com/p-3351-rp...ator-page.html

 

If your running 35's, you really have no business drag racing in my opinion. Going big is only going to hurt you at the track anyway, but your also starting to cross over into some safety issues.

You can still drive on the interstate at higher speeds with 4.88's, but just know that your RPM's are going to be higher, which will make for a less then plesant experience, and potentially less fuel economy when at those speeds. I have 4.56's, and very often wish I had gone to 4.88's instead. The only reason I didn't was because at the time, I wasn't sure if I might want to go back to 33's someday. 33's with 4.56 would still be acceptable, but 33's with 4.88's would not have been. So that's why I did 4.56. Now that i'm pretty sure I will probably always run 35's, I wish I had 4.88's. I almost never drive on the interstate though. Highest speeds my truck ever sees is about 65.

I know a guy who has a highly modded Jeep with 4.88's and 33's. It is really fast too, but when he gets on the interstate (which he has to do every day to drive to work), he's the guy doing 65 in the right lane while everyone else is flying by at 75-80.

 

My truck has only seen 70 a hand full of times. My average speed is about 50 or so. The fastest I drive is 65 and that's really only when I'm headed canoeing a couple times a year.

 

Why exactly do you wish you had went with 4.88's silver?

 

Hills/towing.

 

Yup, hills and towing. I live in the Colorado, and just about everything I do with the truck is in the mountains. The added mechanical advantage of 4.88's would make towing in the mountains or wheeling in the back country much better. Plus, off-line acceleration would be awesome. I don't care about high speed with my truck. Like I said, I rarely get it over 65, so I want as much advantage down low as I can get. You can do some engine work to get that, but the best way by and far is with gears. So gear it for the low end, and do engine mods for the top end. That's my motto.

 

Then I'm going to 4.88's. I do tow on occasion and it's generally around 5500-6000 pounds so I need that extra low end. I also want that off the line quickness.

 

This will get you close to what you need to know:

http://www.ringpinion.com/Calc_RPM.aspx

Note that our 3rd gear is 1:1 and our OD is 0.69:1

I am currently running 265x70x16's (30.6") with a 4.10 gearset I run about 3150 at 70 mph with OD off. OD on is 2170, which is more than good for highway use.

I am seriously considering 255x60x16's (28") for the power off the line. I never tow, don't even have a hitch, and the mods I have all work best in the 2500 to 4500 rpm band. Just not sure how ridiculous that small a tire would look.

Might even consider dropping this thing 2x4. Hmm, getting ahead of myself.

Damnit, I gotta get this cam put in and working right, the desktop dyno's telling me I have 50ft/lbs at 2500 rpms just sitting in the garage collecting dust.

 

Thanks for posting the calculator links...

As I too was toying with the idea of a swap, because I feel that my truck is geared to tall and want more off the line acceleration

Well there goes another $600 bucks for a R&P swap (Frt & Rr)

 

My 255/70/16 (30) are supper fast of the line with 3.55. I can spin them alll day long.