Wheel Bolt circle Question

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Jul 20, 2009 | 01:22 PM

proford1

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From: nw florida

Wheel Bolt circle Question

i seem to remember some of the early 80-81 f100's having the 4.5" Bolt circle (Car pattern) wheels? am i correct or crazy? if im correct would these rotors swap with the larger truck pattern rotors?

thanks in advance.

Jul 20, 2009 | 02:23 PM

uncle.stosh

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Yes, early F100's did have the smaller pattern.

No, you cannot just swap the rotors. You rear would not match even if you could.

Jul 20, 2009 | 06:49 PM

Franklin2

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From: Virginia

You can swap the whole axle beam that has the larger pattern, and it will bolt in. If you are changing the rearend ratio too, then get a rearend to match.

Jul 20, 2009 | 07:23 PM

uncle.stosh

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I personally don't think it's worth the hassle to swap them over.

There are plenty of nice looking wheels in the smaller bolt pattern that will fit right on your truck.

Jul 20, 2009 | 07:52 PM

proford1

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From: nw florida

im actually trying to go to the 4.5 pattern to use mustang wheels.

Jul 20, 2009 | 07:56 PM

first today

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From: Prairieville, La

His question is a little misinformed here. He has a 69 f-100 and I think he is wanting the smaller rotors from the 81 to fit on the i beams of the 69. I believe he wants the car lug pattern on his 69.

Jul 20, 2009 | 10:07 PM

proford1

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From: nw florida

you are correct sir!

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Jul 20, 2009 | 10:16 PM

quaddriver

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From: Cook Forest and Irwin PA

is there really a wheel bearing difference? anyways, the non-HD power brake truck has the 4.5", the manual brake and HD power brake truck has the 5.5.

Jul 20, 2009 | 10:17 PM

#10

first today

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From: Prairieville, La

I would check the parts store and see if they list the same kingpins between the 69 and 81.

Jul 21, 2009 | 04:36 AM

#11

Greyf100

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my '81 with power brakes, and 5 on 4.5" BP has ball joints...

i would like to convert mine to the larger pattern, for the larger brakes...

Jul 21, 2009 | 07:44 AM

#12

quaddriver

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From: Cook Forest and Irwin PA

Quote:

Originally Posted by first today

I would check the parts store and see if they list the same kingpins between the 69 and 81.

there are 2 size kingpins, IIRC the small pattern has the .8953" pin and the manual/hd braked larger pattern has the 1.054 pin

(Im pretty sure of this cuz I did mine a week ago)

so you would need to change the forged ttbs

to tell the truth, all things being equal...if u wanna make a change, ditch the forged ttbs for the stamped ones and go ball joint - just rip if off a different truck - and take the spring mounts as well, the forged ones have this cup shaped perch to make up the height difference it gives up to a stamped on.