tire and suspension question

[4 wheel]

I have 285/75/16's on my 2500 HD, 6.0L. I have a 4:10 rear end.

I figured that my rear axle ratio is now 3:80 with the extra tire height from the stock 245's.

I want to add some additional height to my truck with out sacrificing acceleration. If I increase my tire height will I get better acceleration?

Thanks,

4 wheel

[jeep_cj4x4]

Increasing tire height (larger tires) with decrease your acceleration. Because you are having to turn a larger circumfrance around. The smaller the tire, the quicker the revolutions and the quicker the git 'n' go.

I know there's probably a little more to it and a better way of explaining it but I do know this is on the right track.

[nineball481]

jeep is right. larger tire, slower acceleration. But larger tire = higher top out speed. If you want to increase your height more, you may want to look into a lift kit instead of taller tires.

[nineball481]

oh, don't forget, with larger tires, not only will it effect acceleration but it will also throw off your speedometer, tripometer. Speedo will read 60 while your actually going 63. Odometer/tripometer will count mileage slower (could be seen as a benefit ;-)
Hope this helps

[TXAGG05]

My speedo was off from the factory with 265.75R16s. It said I was going faster than I was(and thus further). At 50k miles I got 285s and now it is perfectly accurate(according to GPS and those little radar trailers). I was thinking the other day that I really got cheated out of a few thousand miles of warranty. Probably only a couple though. I just did my first oil change since the new tires and realized that it took a lot longer than before to rack up 3000 miles. oh well.
Jeb

[4 wheel]

Thanks all for such fantastic responses.
I'm gonna stay with my 285's. The dealer put them on when I purchased my truck as part of the sale. They recalibrated the speedometer.

I'm, still looking for a little more "lift". I don't really want to go the route of a suspension lift as my dealer said it could void some warrantee parts.

With a body lift there will be less to be concerned with a/b warrantee and expense.

Does any one have any suggestions on body lift kits?

What should I be looking for and be careful about?
I only want to go 1-2".

What about Sway Bars? Should I install this after the body lift kit, or doe it not matter?

Thanks again,

4 wheel

[jeverett]

I would say no to a body lift. THey leave unsightly gaps and such. You can get a kit off of ebay that uses different torsion keys to lift the front end 2" or so, and you can also get an add-a-leaf to get the rear to where you want it. Just check e-bay out.

[4 wheel]

A big thanks Jeverett.
Any input on sway bars?
Hey, you have a nice looking truck there.

Is the K & N FIPK one of the Air systems I've heard about? Do you like it, and what do you think your HP gain was?

4 wheel

[jeverett]

I'm not so sure on the sway bars, but I would think that your truck came factory with some, so they should be sufficent.
And yes, the K&N is one of the cold air induction systems on the market, and I love it! I wouldn't even know where to think how much HP I got, but I could tell a difference in power and gas mileage. Oh yeah, thanks for the compliment!

[4 wheel]

Jayson,
I followed your advice and checked out e-bay.
I saw a "Suspension lift Kit" by Victoria Performance that claims a economical 2" lift by changing the keyways and receiving socket for the torson bar suspension on the front end.
This might be just what I'm looking for as I do get slight wheel rub with my 285's.
Do you think this kit will cause any early part wear like the CV joints etc.?

This company also recommended using a "block" in the rear to raise it proportionately to the front.

Steve

[jeverett]

I don't think you would have any problems with the CV joints. I've had my torsion bars cranked for..ever and haven't had any problems. I know a few people who use the kit and love it, so couldn't hurt to give it a shot.

[jeep_cj4x4]

I just saw a set of springs on ebay that provide 2.5" lift for about $100 with shipping. I'm going that route.