Hey guy need some help. I am planning on getting the fabtech 6" suspension for my 2000 4x4 Expy. First, will the lift wear out parts quicker? secondly, when getting new rims and tires, what does the back spacing do and any recomendations? I am wanting to run 35" or 36" tires. I have gone with the airforce one and will be getting the superchips micro tuner before christmas, early present

Any help would be greatly appreciated.


Robert

 

Have you gotten the lift?

If you have, what is your experience with it?

I am planning to lift my 2001 Exp.

 

Back spacing is the measurement from the wheel hub mounting surface to back edge of the wheel rim. It is related to off set which is the distance measured from the wheel centerline to the wheel hub mounting surface. It basically determines how much of your tire will extend beyond the edge of the fender's wheel lip.

35 or 36 inch tires typically have a section width of 11.5" to 12.5". You will want a wheel that is at least 8" wide and no more than 10" wide. Whatever is made to fit the Expedition in that size will have the proper back spacing.

You will probably want to change the rear (and front if 4x4) differential gears also. Depending on your current tire diameter and differential ratio, you may find that the differential ratio with the new tires is too high (low numerically) to keep the engine in its best operating RPM range for accleration and fuel economy. The calculation is simple:

(New tire diameter divided by old tire diameter) x current differential ratio = new differential ratio

In other words, if your current tires are 32" tall, your new tires are 35" tall, and your current differential ratio is 3.55:1, the calculation is:

(35/32) x 3.55 = 3.88

The closest standard differential ratio is 3.90:1.

 

In regards to locking differentials. What is the best one for the Exp? I was looking into Eaton for thier Electronic Controlled Locking drfferntial for the front and rear. Is there a company that makes one for the center diff?

 

Don't know if Eaton makes one for the rear diff. The transfer case locks in 4hi and 4lo. Leave the front diff open. Any kind of limited slip or locking diff in the front will destroy the handling unless it is a switchable locker like the Eaton or an Air Locker.