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Suspension Questions and Answers concerning both OEM and Aftermarket suspensions for the New Generation Tundra.



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Old 10-24-2007, 01:24 PM
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5 lug hubs?

Anyone know why Toyota went back to 5-lug hubs on the 2007 Tundra? My '07 Reg. Cab 5.7L 4X4 (long bed) has 5-lug hubs...the 2000 Tundra SR5 Ext Cab 4.7L 4X4 I traded in for it had 6-lug hubs...so did the '97 T-100 SR5 Ext. Cab 4X4 I traded in for that.....you would think a truck rated to tow 10,300 Lbs. would have more lugs...anyone have any ideas?

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Old 10-24-2007, 01:30 PM
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Toyota is usually pretty thorough in this regard, my guess is they tested both and didn't see a strength benefit, or saw a cost benefit without a loss in strength.

More lugs means more holding strength right? but more lugs means less metal between the lugs.. so which one is better?
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Old 10-24-2007, 02:52 PM
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Great answer! Are the axels built by Toyota or farmed out?
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Old 10-24-2007, 04:20 PM
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I forget the exact #'s, but the new Tundras studs are something like 16-18% larger in diameter than the older Tundra's 6 studs. This means, at least in theory that the new Tundra's studs are actually a little stronger than the old Tundra's 6 lugs system.
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Old 10-24-2007, 05:41 PM
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they went to the parts bin for the most heavy duty overbuilt design availble: the Landcruiser hubs are the same way large 150 mm bolt circle (which reduces the load on the studs thus less required).

By the way if you have trouble finding 18" aluminum wheels search for a 2006 Landcruiser fitment.
Any wheel that fits the 150 mm Landcruiser will fit the Tundra and you will have about a dozen manufactures making them instead of just one for the Tundra
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Old 10-24-2007, 09:53 PM
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Quote:
Originally Posted by bertram928 View Post
they went to the parts bin for the most heavy duty overbuilt design availble: the Landcruiser hubs are the same way large 150 mm bolt circle (which reduces the load on the studs thus less required).

By the way if you have trouble finding 18" aluminum wheels search for a 2006 Landcruiser fitment.
Any wheel that fits the 150 mm Landcruiser will fit the Tundra and you will have about a dozen manufactures making them instead of just one for the Tundra
great advice!
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Old 12-27-2007, 06:55 AM
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The studs are 9/16th diameter, which is fairly stout and the distance between studs is 5.9".....or 150mm. The old five quarter ton military jeeps only had 5 lugs. The rearends are made by Hino, a medium duty truck manufacturer. Other than the fact that they are a semi-floating design they have a differential and axle strength similar to the Dana 70 and GM 14 bolt.
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