driveshaft bolt size
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
driveshaft bolt size
My friends 7.3 has a bad driveshaft balance issue. We are planning to remove it this weekend and send it out to have it balances and replace the U-joints as well as the hanger bearing. Does anyone know what size of bolts thery are?
Another thing I noticed was a leak at the driveshaft to diff point. How hard is it to fix and what's involved?
Thanks
Another thing I noticed was a leak at the driveshaft to diff point. How hard is it to fix and what's involved?
Thanks
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
Bolts on flange at the Transfer Case end should be 12mm 12pt, the Carrier Bearing hanger IIRC is 5/8" (at least mine are), and on the Yoke at Rear Diff is 5/16" (2002+ may have the round flange like on the TC).
Here is a pdf on the pinion seal replacement. Drive Pinion Seal Replacement Dana 80.pdf
You don't really need all the special tools, except to a thin wall 1-7/8" socket for the pinion nut and a torque wrench for the proper tightening of the nut. We used a 4:1 torque multiplier and some extension adaptors to do the ones we've replaced. We held the yoke with a large pipe wrench.
Here is a pdf on the pinion seal replacement. Drive Pinion Seal Replacement Dana 80.pdf
You don't really need all the special tools, except to a thin wall 1-7/8" socket for the pinion nut and a torque wrench for the proper tightening of the nut. We used a 4:1 torque multiplier and some extension adaptors to do the ones we've replaced. We held the yoke with a large pipe wrench.
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Laughing Gas
Joined: May 2006
Posts: 1,192
Likes: 0
From: Oakville, Ontario
Is this right? 597 - 677nm, torque for the pinion/yoke nut? Where do I get a torque wrench to handle this torque.
Anything else I need to follow to pull out the pinion/yoke. The driveshaft needs to have it's u-joints and hanger bearing replaced. Having the shop balance as well.
So any other tips?
Anything else I need to follow to pull out the pinion/yoke. The driveshaft needs to have it's u-joints and hanger bearing replaced. Having the shop balance as well.
So any other tips?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
That's where the torque multiplier that Roland mentioned comes in handy. 4 to 1 means you only need a wrench that reads 25% of that value.
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Laughing Gas
Joined: May 2006
Posts: 1,192
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From: Oakville, Ontario
So the torque is correct? Where can I get a "4 to 1" multiplier?
Another question. Do I have to replace the nut?
Another question. Do I have to replace the nut?
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I think the nut will be fine. One of them fancy tool stores (professional grade) will have or can order the torque multiplier. I've heard a Ford diesel tech say just to use a good air impact and tighten it up as much as the gun will go, but I won't tell you that's what you should do. Of course I also don't remember seeing a torque multiplier for less than $200, and if you're not sure the mechanic would torque it down properly anyway, it might be worth considering.
Senior User
Joined: Mar 2003
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From: Hot Springs Village, Ar
Last edited by Calli; Jun 19, 2012 at 09:23 AM. Reason: info
The company, I work for, lets me borrow ours anytime I need to use it. Problem is, I can't loan it out to others and have to be there when it's used.
New User
Joined: Jan 2018
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Can you help me with the size bolts for a front drive shaft
I am trying to find the specs for front drive shaft bolts for 2003 f150 xlt 4wd 5.4l also if you could tell me the specs for the bolts that hold the front cv axles to the transfer case. My truck was stolen and I got it back minus the front drive shaft and axles I bought the parts but they weren’t thoughtful enough to leave the bolts to put them on with😬 I am having a frustrating time Identifying thanks
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
This is a fairly old thread, plus a forum for 7.3 Powerstrokes. I'm not sure that the bolts would be the same for a 1/2 ton IFS pickup. Might try checking the tech section in the forum specific to your truck.
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