Dana 44 pinion nut torque and preload

[borjawil]

I have searched and searched and found varying information. 63 f100. Dana 44 rear. Swapped gears. Original shims behind rear/inner pinion bearing race and on pinion shaft.

Specs I've seen are 160-200 ft/lbs for nut torque and in/lb for preload ranging from 15 for used bearings, or 13-30 for new bearings.

With that being said I'm hitting 20 in/lbs before getting to 160 ft/lbs. Likely due to the shaft shims being worn. If I'm correct adding shims, on the pinion shaft seat, reduces preload as it moves the pinion/rear pinion bearing away from the race.

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[55blacktie]

I'm afraid that what you are saying is beyond most of us. You might be better off talking to a differential specialist.

[borjawil]

Unfortunately the dana 44 has so many varying versions so finding the correct info has proven to be difficult. But looks like 130-160 ft/lbs is correct. Generally 20-30 in/lbs for preload is correct for new bearings (across dana 44s). Used bearing preload is generally 13-15 in/lbs.

For others looking too much preload with ruin the bearings. Note that when setting up preload you don't use a seal, no carrier or axles in diff. Once everything is together the seal, and force from carrier/axles will add to preload. However the spec for preload is without anything attached.

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[KULTULZ]

Unfortunately the dana 44 has so many varying versions so finding the correct info has proven to be difficult.

Exactly. Unless one has the exact correct original application, reliable parts source and exact service procedures,

The axle design has been in service so long across many auto manufacturers and being re-designed as it goes makes servicing one difficult, unless you do them everyday.

[rotorwrench]

I only have the info for the Dana 44 axles used in the F1 & F100 pickups and Mercury cars of the early to mid 50s (19-spline). They used shims to adjust the preload but I have no idea what the later ones used. The crush sleeves came along later for Fords. A person torques them till they are within the correct preload so there is no real torque on those types.

[borjawil]

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Up to 71/72 used preload shims and no crush sleeve.

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