Awhile back I mentioned that my driver's rear tire was wearing oddly on the outside edge, chewing it up. You all recommended that I check the toe-out IAW the 20-2.
I checked everything. I did the "grasp and shake" tests. Spindle bearings, control arm bushings, radius arms are all very snug. No play at all.
Next, I did the string test. 3mm gap between the string and the rear of the rear tire on the driver's side and 1mm on the passenger side. 3mm is max allowed.
Next, I did the chalk-and-roll test. The distance at the "point of measurement" was shorter on the rear of the tires than the front of the tires, which indicates "toe out", which is correct according to the manual.
A bit of background:
When I first bought the truck, it had crappy bias tires. I hauled a$$ home, 80 miles at 55mph without a hitch. The bias tires looked perfectly fine.
I upgraded to 12-bolt wheels and M/T's. (Admittedly used). We've driven the truck many miles at slower speeds around town and I never noticed the odd wear pattern.
I did not notice this wear pattern until I drove the truck to work and back one day at 55-60mph. I'm beginning to suspect that the problem is the tire and not the truck. I have a low tread spare tire that has perfectly evenly worn tread. I've installed it and I'm going to cautiously drive the truck and observe the outside edge.
If it starts looking chewed up then I know that I probably didn't perform my measurements precisely enough and I'll try again. I'll try to entice some local-ish M998 owner to come work with me.
I checked everything. I did the "grasp and shake" tests. Spindle bearings, control arm bushings, radius arms are all very snug. No play at all.
Next, I did the string test. 3mm gap between the string and the rear of the rear tire on the driver's side and 1mm on the passenger side. 3mm is max allowed.
Next, I did the chalk-and-roll test. The distance at the "point of measurement" was shorter on the rear of the tires than the front of the tires, which indicates "toe out", which is correct according to the manual.
A bit of background:
When I first bought the truck, it had crappy bias tires. I hauled a$$ home, 80 miles at 55mph without a hitch. The bias tires looked perfectly fine.
I upgraded to 12-bolt wheels and M/T's. (Admittedly used). We've driven the truck many miles at slower speeds around town and I never noticed the odd wear pattern.
I did not notice this wear pattern until I drove the truck to work and back one day at 55-60mph. I'm beginning to suspect that the problem is the tire and not the truck. I have a low tread spare tire that has perfectly evenly worn tread. I've installed it and I'm going to cautiously drive the truck and observe the outside edge.
If it starts looking chewed up then I know that I probably didn't perform my measurements precisely enough and I'll try again. I'll try to entice some local-ish M998 owner to come work with me.