Upgrading axles 5 on 4.5 or 5 on 5.5?

ZachMan said:

I found many nodular 31 spline big bearing 9" axles. One of which is a 1980 and is a rare 5 on 4.5 bolt pattern. My question is should I use this axle or one of the others that are 5 on 5.5? They are all 31 spline and big bearing.

I still have my d30 up front which is why I would like to go w/ the stock pattern, but I may wait and upgrade the front too. I got a few axles I need to get rid of, lol! :guitar:

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Vug said:

I've never heard of a 31 spline nine with the 5 on 4-1/2 pattern. The small BC was used on cars and were 28 spline. I also thought the nodulars were all truck apps, hence 31 spline, big bearing. Can you tell me what vehicle this is out of?

And Useless... what HP44 wasn't already 5 on 5-1/2?

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ZachMan said:

80-82 F100 2wd., Some reason these years the trucks came w/ power brakes and because of that they had 5 on 4.5 pattern.

Also, the axles I found are all 61 1/4" to 65" wms to wms. Anyone need a 9"?

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ZachMan said:

80-82 F100 2wd.,
Anyone need a 9"?

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