Front diff torque
Cargo Master
Joined: Apr 2007
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Tighten to the standard for the thread type and material grade. Here is a random example from a Google search, Metric Bolt Torque Table - CNCexpo.com
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New User
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Clonking/ banging noise
Thanks...so here's the deal...problem I'm having, I bought this 2010 f150 from the company I work for, front diff was shot, front drive shaft was in the bed, that's all I knew about the truck so I bought a complete front diff from a used place, it only has 58000km on it, good diff... So I installed the diff and the old front drive shaft, which doesn't seem to be in the best condition, now when 4 wheel drive is engaged I'm getting a constant clunk/binding noise from the front driveshaft area,,,, any ideas on where to start looking,thanks again
Logistics Pro
Joined: Jan 2005
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From: penn twp.
FWIW both the front diff and the rear diff should have tags on them that will tell you what gear ratios they each should have. And one other thing to keep in mind, using your rear end gear ratio at 3.55:1 the front diff may not be 3.55:1. It could be 3.54:1. The reason is so that the two diff. don't pull the truck apart. What you don't want to see is the rear diff with 3.55:1 and the front diff with say either the 3.15:1/3.14:1 or 3.73:1/3.72:1.
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New User
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Other than the tag on the front diff plate, how could I tell what ratio it is...the tag on old diff isn't readable?
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Logistics Pro
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From: penn twp.
Well you can jack the truck up and support it on jack stands. Mark a reference point on the tire and one on the u-joint yoke. Then rotate the wheel one full rotation and count the number of rotations of the yoke. IIRC 3.5 rotations of the yoke to 1 rotation of the tire gives you the 3.55:1 ratio. Or you could tear into the differentials and count the number of teeth on the ring gear and the number of teeth on the pinion gear do some math and find the ratio that way. Not sure of exactly how to do it this way, but a simple bing search will help get that info.
Cargo Master
Joined: Apr 2007
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You can't do the tire rotation method on the front without removing the rear driveshaft or else the other front tire will spin and the driveshaft won't.
10 rotations of the tire is a lot better if you're getting down to the decimal place, which you are. A piece of tape on the tire and another on the driveshaft, and a piece of paper so you don't lose count.
10 rotations of the tire is a lot better if you're getting down to the decimal place, which you are. A piece of tape on the tire and another on the driveshaft, and a piece of paper so you don't lose count.
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Thanks for the quick response and help, I think I will start by counting the crown and pinion teeth from the old diff and go from there.... Live and learn... Glad it wasn't to big a job putting in the wrong diff lol
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