I have a 1991 3/4 ton 4x4 Suburban.  I bought some 17x8.5 Hummer wheels for it and want to put the stock 315-70-17 tires on it.  Can I get away with a two inch lift on it?  If I have to go with the 4 inch kit will I have to change the driveshafts?  Are there any other modifications that will have to be made?  Thanks in advance.

Dave Johansen

Is a 91 suburban the old body style with a dana 44 or 10 bolt front  axle?

Yes it is the last year of the old body style.  It looks like a 10 bolt but I'm not sure what a Dana 44 looks like.  

I had a 4" lift on my 84 burban, and there was no need to change driveshafts. My 4" didnt really clear the 35's all that well, I had to sledgehammer the inner fenderwell a bit and trim off the corners of the outer fender.

A 2" probably wont do it, as your 315/70/17 measure 34.4x12.4x17 (which in real life is as close as any 35x12.5 tire is to actually being 35x12.5).

A four will probably be a little tight like mine was, but trimming the fenders is easy and looks fine if you take your time.

with a 4" lift, you can get by with the factory steering system (mine was fine) but with a 6" you will have to get steering correction components, and you may require driveshaft changes, but a 6" will clear 35's perfectly.

Good luck.

I think I'll go with the 4" and do the trimmin'.  Thanks for the help.

Dave Johansen

Check the offset on the Hummer wheels, that might casue fitment problems, I'm not sure though, I know they have a weird offset.  As for the lift and driveshfts, I have a 6" lift of a 1995 K1500 ext Cab pick up and my driveshafts is length is fine.