Spare tire
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Mountain Pass
Joined: Apr 2009
Posts: 137
Likes: 1
Spare tire
Hey guys, I have a 2014 with a 4" lift with 20" factory rims and 12 1/2" x 35" tires. I recently had a flat and had to use the spare tire, obviously the spare was smaller than the other tires. I had no choice but to drive it about 200 miles before I could get it fixed. After I got back I started to get opinions about the spare tire turning faster than the 35" tire on the rear of the truck and someone said I could cause some damage in the rear end because of the different turning ratios. I changed the rear diff oil and did not find any evidence of any metal shavings or anything, but I started thinking...does anyone know if a 35" tire on 20" rims will fit under the box for the spare tire location? with the camper on the truck there is no where to keep a spare tire
thanks for any opinions
thanks for any opinions
Hotshot
Joined: Oct 2015
Posts: 19,734
Likes: 12,877
From: Wyoming
With an open differential there isn't a problem with tires of different diameters. If you had engaged 4x4 mode it would be a different story. You're fine. Using the smaller spare is a short term cosmetic issue.
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
I have a 37x13.50x20 tire mounted underneath in the factory location. It is tiiiiight, but it fits. When I discovered this, I was VERY happy! I carried around a full size spare for 13 years in my 7.3!
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DogRidesInBack
1999 - 2003 7.3L Power Stroke Diesel
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Feb 9, 2018 08:40 AM
