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Old 07-23-2011, 11:39 AM
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Unit bearings

Hey Folks,

I'm pretty sure my front passenger's side main bearing is going out. I lost the driver's side about 20k miles ago, now I feel/hear some similar rythmic clunking from the passenger's side. I'd like to be totally sure before ordering the part though. Could it be the other bearing up there (needle bearing?) Also, I was advised to buy the Timken assembly from rockauto. I'm SRW 4x4, but they have one with fine thread studs and one with coarse thread studs (coarse is about $15 more.) Are these the wheel studs? How can I be sure which I have?

Thanks,
Jack
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Old 07-23-2011, 01:08 PM
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Wheel studs


The fine thread studs have 1.5 mm pitch, the coarse threads have 2.0 mm pitch.
Just measure the thread pitch to see which ones you have, the difference is obvious.
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Old 07-23-2011, 01:44 PM
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Quote:
Originally Posted by 74baja View Post
Hey Folks,

I'm pretty sure my front passenger's side main bearing is going out. I lost the driver's side about 20k miles ago, now I feel/hear some similar rythmic clunking from the passenger's side. I'd like to be totally sure before ordering the part though. Could it be the other bearing up there (needle bearing?) Also, I was advised to buy the Timken assembly from rockauto. I'm SRW 4x4, but they have one with fine thread studs and one with coarse thread studs (coarse is about $15 more.) Are these the wheel studs? How can I be sure which I have?

Thanks,
Jack
Hi Jack, yes the wheel studs is what they are talking about. Your truck should have the coarse thread wheel studs. I believe the change was made in 2002 to fine thread.

Best way to know for sure is to check a wheel stud with a pitch gauge.
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Old 07-23-2011, 02:49 PM
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If you want to be sure, they are not that hard to pull so you can check the needle bearing. I got Timken's at my local NAPA but had to ask for the USA made units. They also offer a cheaper one made in china. They had both in stock.
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Old 07-23-2011, 02:59 PM
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Best to check the pitch. Maybe buy a couple lug nuts, corse & fine if you dont have a pitch gauge. Mike said in post 43 his 03, 250, 4X4 had fine threads studs in this thread. Hope this helps.

http://www.ford-trucks.com/forums/10...g-apart-3.html
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Old 07-23-2011, 03:23 PM
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Thanks guys, I'll check the pitch.

I think I'll order the unit bearing from rockauto, and check it when I have the old one apart. If the needle bearing seems to be the culprit, I'll buy one and return the unit bearing. I just want to get the good deal on rockauto, unless my local parts house has it cheap.

Thanks again
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Old 07-23-2011, 06:47 PM
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buy the cheapest one and change the studs if they are wrong. it is all of 5 minutes to change them.
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Old 07-23-2011, 10:39 PM
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But DON'T use a hammer to remove the lug bolts and install the correct ones!!!

No hammer!

Pop
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