diff. bearing cap bolt torque specs needed

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Feb 29, 2000 | 11:21 PM

Superdave

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diff. bearing cap bolt torque specs needed

I need the torque specs for the rear differential bearing cap bolts on a 94 Ford Aerostar, 7.5" Ford rear end, 2 wheel drive. I think its the same rearend used in the Ford Rangers. Thanks!

Mar 1, 2000 | 07:06 AM

Mark P

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diff. bearing cap bolt torque specs needed

My 88 Aerostar Factory Manual shows the Ford 7.5 inch Diff bearing cap bolts to be torqued to 70-85 ft-lbs.
Don't know if it's the same for the 94.
Mark

Mar 1, 2000 | 04:38 PM

Superdave

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diff. bearing cap bolt torque specs needed

Thank you Mark P for the information. I would say the specs would be the same for both years. Once again thanks.

Mar 1, 2000 | 07:45 PM

Mark P

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diff. bearing cap bolt torque specs needed

Just a reminder. Torque spec's are always given for clean dry threads with no lubrication on them.
That is, if you were to torque the bearing caps to 70 to 85 ft-lbs with oiled threads, they could snap off on you since the bolts would be streached way beyond the design specification.
Many people don't realize this but I thought I'd mention it just in case so you don't damage them.

Mark

Mar 3, 2000 | 12:48 AM

Superdave

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diff. bearing cap bolt torque specs needed

Mark P, Yes I was aware of that, thanks. Does your 88 Aerostar have a metal differential cover or is it the plastic one? I have the plastic one and found a crack in it when cleaning up for re-assembly. I had a damp spot there ever since the pinion bearing replacement I mentioned earlier. Now on close inspection I know why. I had to re-install it as the wife needed back on the road and it had not leaked badly before, still not now. But I'm going to replace it anyway and would like to go to the metal cover. I though my 88 I used to have had a metal cover on it. I assume they used this 7.5" rear end back then also. I can get a new plastic cover for $18.00 from Ford or a used metal one off an older Aerostar for $10.00 from a wrecking yard. I would prefer the metal one. Thanks.

Mar 3, 2000 | 07:00 AM

Mark P

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diff. bearing cap bolt torque specs needed

My 88's is the Ford 7.5 and plastic too. When I changed the gear oil and added Fords friction modifier for the limited slip, my plastic one was in good shape and only needed careful scraping off of the old silicon and replacement. Torque specs require 15 to 20 ft-lbs, not much.
The 88 Factory service manual shows that a Dana model 30 rear axle was used also, and it's cover may be metal. It can be identified by the oil add plug being on the cover verses the front of the diff housing on our Ford 7.5's. They are not interchangable.
If you go the junk yard route, be sure someone hasn't over torqued the bolts and maybe cracked the plastic. Might be smarter to buy a new one and avoid all the cleaning of the old one. Just some thoughts.
Regards, Mark Paar

Mar 4, 2000 | 12:35 AM

Superdave

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diff. bearing cap bolt torque specs needed

Mark P, I found that out today about the covers I guess all being plastic. I found a cover from and older Aerostar and it was plastic, It wasn't cracked anywhere so I went ahead and bought it for $10.00. If I had not went to the wrecking yard looking for a metal one, I would have just bought a new one. I hated not to buy anything after having the guy walk around in the cold looking for one. Thanks.