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TakerEasy · 01-28-2007, 10:19 AM

1998 P32 with Dana 80 semi floating axles shafts.

Refilling differential with 75W90 Mobil 1 synthetic Gear oil.

I have two questions.

1) Does anyone know the axle flange bolt torque?

These are the eight bolts with hold each axle in. My book seems to be incorrect as it shows 15 Ft.Lbs on one page and 115 Ft.Lbs on the next page. Neither appear to be correct.

They are a 7/16" course thread, with a 9/16 Head and 7 hash marks.

2) Next, just totally drained differential and removed axles shafts for bearing service so it's totally dry. I filled the diff. until the oil ran out the fill plug, just like I always have done. It took 10 pints, however looking at the workhorse manual, it states it only holds 7.2 pints for the Dana 80. Any input?

Thanks in Advance.

TakerEasy · 01-28-2007, 10:19 AM

1998 P32 with Dana 80 semi floating axles shafts.

Refilling differential with 75W90 Mobil 1 synthetic Gear oil.

I have two questions.

1) Does anyone know the axle flange bolt torque?

These are the eight bolts with hold each axle in. My book seems to be incorrect as it shows 15 Ft.Lbs on one page and 115 Ft.Lbs on the next page. Neither appear to be correct.

They are a 7/16" course thread, with a 9/16 Head and 7 hash marks.

2) Next, just totally drained differential and removed axles shafts for bearing service so it's totally dry. I filled the diff. until the oil ran out the fill plug, just like I always have done. It took 10 pints, however looking at the workhorse manual, it states it only holds 7.2 pints for the Dana 80. Any input?

Thanks in Advance.

Wallaby Dan · 01-28-2007, 05:02 PM

Is the coach on level ground, also since it is 'dry' you should have put a little wheel bearing grease on the bearing so they would be lubed till the oil made it's way to them. Mine took about 8 qts on mine[p-30]. I think that 15 ft pds is correct.

Bigdaddy · 01-29-2007, 12:56 AM

I asked the same question some while back. The best answer I received was to torque them to about 80/ft lbs. A 7/16 grade bolt might break at 115/ft lbs. Maybe someone might have the correct torque.

DriVer · 01-29-2007, 04:40 AM

The best information that I have indicates 115 lbs/ft of torque.

TakerEasy · 02-09-2007, 07:28 PM

Thanks for the replies.

My oil level, after the bearings were full was about 3/4" below the fill port cold. Warm, after 15 miles it was barely coming out the fill hole. So that should be fine.

I see where many of the folks running Dana 80's go the the extra capacity covers which also fills to the bottom of the axle shaft instead of the OEM fill to the bottom of the tube.

Axles flange torque. I looked it up for Grade 8 bolts and went to 80 ft.Lbs. I tried 115 on one of them and it pulled the threads. I'm taking a 200 mile trip next week and I'll double check the torque afterwards.

All the information in my service manuals seem to be pretty good until I came to the rear differential. I realize there two different Diffs available, American and Dana, but there is lots of conflicting information regarding them, such as torque values, wheel bearing adjustments and capacities.

rgrstndgby · 02-10-2007, 03:00 AM

TakerEasy... interesting thing you opened up here re: 7/16x14 grade 8 bolt torque.. I thought this was easy, simply consult a chart, and there it would be. NOT so easy, every chart I looked at, my own and online, had its own opinion.. low 60, to a high of 83, so it looks like your in the proper range..I'd say, from past experience be carefull to not overtorque. Expansion from heat can overTENSION(not torque)the bolt and cause separation. Rechecking is smart. BTW, you say 7 marks, are they located radially, or 7 in some other arrangement?..rgr....

TakerEasy · 02-10-2007, 05:09 AM

They are radial hask marks. When I looked up the code it came up as "Special Application".

rgrstndgby · 02-10-2007, 06:35 AM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">When I looked up the code it came up as "Special Application". </div></BLOCKQUOTE>

"curiouser, and curiouser", that could mean alot of things, any idea what?.. Shoulder style, coating.. Interesting ( to me

) that such a large amount of the specified torque is consumed in friction. I imagine thats why alot of applications measure bolt stretch instead of torque. I'll "get off" here, I imagine this is getting boreing, but thanks for the subject...rgr...

Bigdaddy · 02-10-2007, 09:08 AM

Post a picture of the bolt head. I am sure someone will come up with the proper torque.

TakerEasy · 02-11-2007, 03:24 PM

I agree measuring actual Bolt Stretch is perfect for those items where you have access to measure the length, such as connecting rod bolts.

Torque Charts are designed to be used in places that you can't actually measure the length since they should take into account for proper stretching and preloading of the bolt, type of plating, and or lubricant.