My 89 4x4 came with 235/75-R15 Goodyear Wrangler Radials which are about 29
inches in diameter.
By the way some of your mpg loss may be due to speedo error due to the larger
diameter tires. The speedo bases it's readings on revolutions of the drive
shaft. If you install larger diameter tires the truck actually moves further
with each revolution of the drive shaft but the speedo still think it is moving
the same distance based on the diameter of the stock tires.
Dave Clement
_______________________________________________________________________________
To: dakota@csclub0.cs.fredonia.edu@INTERNET
From: DFuller288@aol.com@INTERNET on Fri, Feb 2, 1996 11:12 PM
Subject: Larger Tires on 4x4 Dakota
I've been running a set of 31" Uniroyal Laredo tires on 93 4x4 5.2L Club Cab
for over a year now. I bought truck used, and put tires on right after
buying. 4x4 shops and dealer said 235-75R15 was largest that would fit.
These 31" tires barely fit but have never rubbed. I did notice a drop in ga
milage of about 2-3mpg after the change. I think the engine is now running
below the optimum power zone. At 65 mph, the tack reads about 1800 rpm. A
bit low. On even slight inclines, the 4 speed auto trans shifts back and
forth out of 4th and 3rd gear. It gets quite annoying. Next tires will be
235-75R15. The 31" tires do look good, however.
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