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Old 07-21-2007, 09:07 PM
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a-body mopar axle shafts

hi all im stumped on a problem...

my gf has a 68 dodge dart that im working on and I bought an "a-body" 8.75 rear end for it. Everythings fine but, the axle shafts are 5 on 4" bolt patterns if I am correct... now i have a 73 challenger and a 73 barracuda and both car's axle shaft bolt patterns are bigger; 5 on 4.50 bolt patterns im guessing (big bolt pattern im guessing)?

can i drill holes on the dart axle shafts to be that of the big bolt pattern wheels?

I got the idea from hot rod magazine. Check it out:

http://www.hotrod.com/projectbuild/1.../photo_02.html

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Old 07-22-2007, 05:28 PM
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IF ... there is enough metal ... sure no problem. Rodders have been changing wheel patterns for years.

Moser even offers that machine shop service ... reasonable cost also.

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Old 07-22-2007, 05:50 PM
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thanks

im workin on the mesurements right now so as to put the big bolt pattern on those little axles... anyone happen to know where i can get the bolt pattern layout with measurements and what not or do i have to continue doing it the long and hard way and measure everything???
i have a friend with a machine shop, and he says he'll do the machining but i need to get him the measurments.

and thanks again for letting me know it possible deuce.
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Old 07-22-2007, 08:58 PM
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A 5 on 4 inch pattern ... has a radius of 2 inches ...
A 5 on 4 and 1/2 inch pattern has a radius of 2.25 inches ... you would only need to move the studs out 1/4 of a inch. I would index the 5 studs half way between the other studs and out 1/4 of a inch.

Real easy to do with a divider head ... a good machine shop would have one. Index the studs 72 degrees each position.


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Old 07-22-2007, 09:30 PM
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what do you mean by index? off set them from the origionals??? and thanks

also how do i make sure i dont make the holes arn't too close or to far apart from each together.... probably a dumb question but, with my measurments my bolt holes are either too close or too far apart from each other

Last edited by Arillious; 07-22-2007 at 09:38 PM.
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Old 07-22-2007, 09:36 PM
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That's a chuck type rear. So, the axle shaft has a big hole in the flange to get at the shaft retainer/bearing plate nuts. That hole is located between 2 studs.

I've heard of redilling those to the big pattern, but I don't recall how they got around that problem.
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Old 07-22-2007, 10:25 PM
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anyone know how many degrees each bolt hole is apart from one another from center to center?
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Old 07-23-2007, 08:40 AM
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360 deg /5 =72 deg
I did the same to my 8 3/4, if I where to do it again I would use after market
axles cut to b-body spec, then use avalible b-body backing plate and drums.
A-body brake drums are very hard to find and very pricey.
I paid $300.00 for a pair of new drums!!!!
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Old 07-23-2007, 12:16 PM
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i figured it out last night! thanks guys

about the drum thing... i read some where that since im using big bolt pattern, i could take the backing plate and drums off of a car that has the same pattern....

or why not just machine holes on the drum to match the new pattern?
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