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Thread: Lug # and pattern
12-11-2012, 05:49 PM #11
For Ford, they have used 6 lug since 2004 IIRC. Ford had a 7 lug wheel for heavy payload models.
GM switched to 6 lug for the 1/2 tons trucks in 1999 and continue to this day.
IIRC, all 3/4 and 1 ton Ford, GM, and Dodge/Ram have 8 lugs.
Toyota continues to use 5 lugs to this day on the Tundra.
12-11-2012, 06:45 PM #12
I don't think there's a set reason as to the number of lugs, but in general more lug (or larger lugs because some medium duty trucks use 5 or 6 really thick lugs) spreads the forces between the wheel and the hub over a larger area, which gives it more strength to resist any sort of impact or damage it might have to deal with. I think as far as weight goes, most truck axles would be damaged before you managed to shear all of the lugs at once, regardless of whether its 5, 6, 7, or 8, but the extra lugs are probably still there because its better not to take that chance.
The other thing to think of is that the lug nuts hold the wheel and the hub together side-to-side and creates friction between the hub and wheel, holding it in place. The lug nuts generally don't take a lot of rotational force because the friction between the wheel and hub do that. The lug nuts just keep everything in place so it all works. If the manufacturer thinks they only need 5 lugs to sufficiently maintain that friction, then the number of lug nuts doesn't have a huge effect on the end result.
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12-12-2012, 03:17 PM #13
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They still have 7 lug vans. I understand that the rear lugs are under minimal strain, but the fronts have to be under more pressure because they hold the wheel on while steering.
I really was just wondering if there was a standard which it seems there isn't.
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12-14-2012, 04:26 PM #14
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Just for the record, there are some "light duty" 3/4 ton trucks have have 6 lugs. One that sticks in my head is a 1990 Silverado 3/4 ton.Christopher
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