I was looking at spindle source 4 inch lift spindles and was wondering if the factory 20 inch wheels and 275/65/20 nitto trail grapplers will fit with out back spacing issue. Their site says nothing more than 4.75 inch back spacing does anyone know the back spacing on factory wheels

 

I do not, but I guarantee it is not 4.5. That being said I ran that size tire for a bit on my truck but I have a 4x4 which typically higher that the 2wd.

 

So you guarantee its not 4.5 inch back spacing. So they will fit or no?

 

With a spindle lift of 4", you should be just fine, that is 34" tire which is not that big for our trucks.

 

The back spacing of the factory rim won't be an issue?

 

No because that tire is only 10.8" wide which is not very wide at all. I have a 2" leveling kit and my tires are 12.5" wide.