I am doing a Grand Am brake conversion. Instructions say to use a longer (54mm) front wheel stud. The only one I find that I find in 12 X 1.5 X 54mm is a Dorman pt# 610-323 . This is slightly smaller on the knurled diameter and slightly smaller diameter on the head. Is this the part number to use or does anyone know a better one that matches the Fiero stud except longer?

That's what I used with no problems.

BTW, where's Winnebago?

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1986 SE 350 V8

That stud did not work for me. I bought West Coast Fiero hubs and the stud holes were too big. So I went searching for a suitable replacement. Here is the thread where it was discussed with part numbers: https://www.fiero.nl/forum/A...090219-2-080531.html

The pic:

[This message has been edited by Hudini (edited 08-08-2009).]

For Canadian NAPA owners:

641-1581 Wheel Bolt M12-1.5 X 54mm (Retail $3.50)
641-2138 Wheel Nut (Retail $3.30)

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Brian
86 GT Fastback

My '87 SE has the 4-wheel Grand Am brake upgrade. Here's how I handled the wheel stud situation:

I was able to use the Dorman 610-323 studs on my rear hubs, but had to use the 610-376 studs on the front. My front hubs also came from WCF, and have the holes drilled slightly larger. I also had to enlarge the holes in the front (Grand Am) rotors to 9/16", because the knurled section on the 610-376 studs protrudes out from the hub.

Both the Dorman 610-323 and 610-376 are available at Amazon.com for a little over a buck apiece.

[This message has been edited by Blacktree (edited 07-25-2010).]

I used the 610-323 on my 11 1/4 brake upgrade with cut down factory rotors. The studs where plenty long, actually could have been quite a bit shorter. The head and knurled diameter matched the factory style ones I pulled out.

Jason

Do you have to use longer studs on the back of the grand am upgrade?

No, you don't have to because there are enough threads left on the stock studs to still mount the wheel. However, the stock studs will not reach the end of the lug nuts anymore making the setup weaker than stock. How much weaker? Is it still safe? Maybe, maybe not. No one wants to find out when such an easy solution exists.

Like Hudini mentioned, the rear wheel studs end up being just a tad too short. We're talking maybe 1/8" at the most... probably not an issue unless you race the car (wheel stud length is one of the things they check). And the 610-323 studs are about 1/2" longer than stock. So you end up with lots of extra thread sticking out of the lug nuts.

On the other hand, longer wheel studs on the front are definitely needed. With the Grand Am rotors installed, the stock wheel studs will only go about halfway into the lug nuts. Not good, even for a daily driver.