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EFV-8 Club Forum / General Ford Discussion / 1950 Ford car differential

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Discussion Topic: 1950 Ford car differential

carcrazy

07-05-2025 @ 9:20 PM

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Posts: 1976
Joined: Oct 2009

If the rear axle was not making any noise before you replaced the seal, the manual just says to tighten the nut, I would guess that about 20 ft.lb. would be tight enough if you use with Loc-tight.

When the ring and pinion are out of adjustment or worn excessively, the noise they make will be most prevalent on the overrun when the vehicle is coasting with no load on the axle.

dlpierson

07-05-2025 @ 8:51 PM

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Posts: 24
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Thanks for detailed reply. There is one shim between bearing spacer and front bearing. Bearing looks ok so I could put everything back together as it was but with new seal. How tight should I torque down the nut (usingLoktite)?

carcrazy

07-05-2025 @ 4:41 PM

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Posts: 1976
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This is an extremely difficult question to answer. The official procedure is to mark the position of the universal joint flange, nut and pinion shaft with a punch to aid in obtaining the same pre-load when assembling the unit. Install the washer and nut on the pinion shaft, then tighten the nut until it is tight on the pinion shaft with the punch marks on the flange and pinion shaft aligned.

Since the nut on your pinion shaft was already loose before you started working on it, you have no way of knowing the original location of the nut on the pinion shaft.

Was the rear axle making noise before the seal started leaking and the nut became loose? If so, you will probably have to go through a complete rebuild of the differential assembly including a new matched ring and pinion assembly and installing the new shims required to establish the correct (noiseless) adjustment of the ring and pinion.

In my experience, if the axle was making noise beforehand, the pinion shaft nut will loosen once you have installed and tightened it. I would apply Loc-tight to the threads on the pinion shaft before installing the pinion shaft nut.

dlpierson

07-05-2025 @ 1:53 PM

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I am in the process of replacing the pinion seal on. ‘50 ford differential. It seems the pinion nut had backed off loosening the front pinion bearing permitting the shaft to whip around and wipe out the seal. Question: with new seal in place how tight should the nut be torqued back on. And should I use Locktight?

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