axle splines

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Mar 15, 2002 | 07:42 AM

dzjammer

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From: Nebraska Farm

axle splines

Mar 17, 2002 | 02:44 PM

bigf150

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From: Meriden USA

axle splines

How many splines would a stock 9 inch rear end have in a 79 f150 i think its either 21 or 31. Thanks for your time

Mar 17, 2002 | 02:58 PM

Mil1ion

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axle splines

It's either 28 or 31.

I would say 28.

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Mar 17, 2002 | 03:13 PM

Ford79

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From: Hampstead, NC

axle splines

It depends on if it's a 2wd or a 4x4. The 3 4x4 9 inch rears I've pulled apart have had 31 splines. The only way to know for sure is to pull the axles and count the splines.

Mar 17, 2002 | 03:35 PM

rc351w

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axle splines

[updated:LAST EDITED ON 17-Mar-02 AT 04:36 PM (EST)]2 or 4 wheel drive makes no difference. The difference is between the axle weight rating. The lighter weight had the 28 spline axles and the 31 spline were found in the heavier rated trucks. Most F100's had the 28 spline while the F150's could have either. You don't need to pull the axle and count the splines to determine which you have, just unbolt the retainer and pull the axle far enough to see the bearing. The 28 spline will have a ball bearing assembly and the 31 spline will have a roller bearing assembly.