Installing Longer Wheel Studs, rear hub - shortcut & tips. - ZR-1 Net Registry Forums

RussMcB · 05-31-2015

I'm adding this post in case it saves someone some effort in the future.

I bought longer studs(*) a few months ago, and have not been looking forward to installing them, but finally got around to it today.

I found out, you do not have to remove the hubs, as mentioned in the FSM.

On the left rear, I started by following the FSM steps, but then I noticed the bottom of the hub (near the 6:00 position) seemed to have enough clearance to slip in the longer stud, barely. That was a relief. The hub star bolts were being a pain.

For some reason the right side did not have enough clearance, so I had to remove a tiny bit of material from the caliper mount/hub housing. I wasn't crazy about doing that, but it's a meaty area, and I smoothed it out with sandpaper to remove any possible stress points.

You do still need to remove the caliper and rotor, but you can leave all of the other parts mentioned in the long FSM procedure.

Another thing I noticed was it was very hard to rotate the hub after about one-third rotation. It seemed to hit a hard stop. However, after I remounted one of the rear tires, I had enough leverage to overcome the resistance (I assume is from the limited slip).

* gmpartsdirect.com
Part: 22551491 (special order non-returnable part)
Description: Olds Rocket parts (Wheel Studs)
Unit Price: $5.73
Quantity: 10
Ext.Price: $57.30
SHIPPING: $12.97
TOTAL WITH TAXES: $70.27

PS. Later while Googling, I noticed someone strongly suggesting to not remove the small wheel speed sensor bolt because they are often seized and will break the head off easily, making the job much bigger than planned.

Mystic ZR-1 · 05-31-2015

How long are the stock studs and the new ones?

efnfast · 05-31-2015

Why are you installing longer studs?

RussMcB · 05-31-2015

Quote:

Originally Posted by Mystic ZR-1

How long are the stock studs and the new ones?

Total length for the stock studs are 1.75" long (including the head and .25" unthreaded tip).

The longer studs I bought are 1.25" longer (including .5" unthreaded tip).

Quote:

Originally Posted by efnfast

Why are you installing longer studs?

To have enough threads to run spacers.

Here are the lug nuts I bought:
http://www.ebay.com/itm/Wheel-Mate-M...item58b51edcdd

Z51JEFF · 06-04-2015

When I had the GS wheels on my car I had to run longer studs,I think they were 2 inches from GM. I ground of the 1/4 of dead material from the threaded area and had to grind a flat on one side but they will slip in but you need to keep rotating to hub to get the right spot. I didn't need to grind on any part of the suspension. There's pictures in a thread here somewhere.

05-31-2015	#1
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Installing Longer Wheel Studs, rear hub - shortcut & tips. I'm adding this post in case it saves someone some effort in the future. I bought longer studs() a few months ago, and have not been looking forward to installing them, but finally got around to it today. I found out, you do not have to remove the hubs, as mentioned in the FSM. On the left rear, I started by following the FSM steps, but then I noticed the bottom of the hub (near the 6:00 position) seemed to have enough clearance to slip in the longer stud, barely. That was a relief. The hub star bolts were being a pain. For some reason the right side did not have enough clearance, so I had to remove a tiny bit of material from the caliper mount/hub housing. I wasn't crazy about doing that, but it's a meaty area, and I smoothed it out with sandpaper to remove any possible stress points. You do still need to remove the caliper and rotor, but you can leave all of the other parts mentioned in the long FSM procedure. Another thing I noticed was it was very hard to rotate the hub after about one-third rotation. It seemed to hit a hard stop. However, after I remounted one of the rear tires, I had enough leverage to overcome the resistance (I assume is from the limited slip). gmpartsdirect.com Part: 22551491 (special order non-returnable part) Description: Olds Rocket parts (Wheel Studs) Unit Price: $5.73 Quantity: 10 Ext.Price: $57.30 SHIPPING: $12.97 TOTAL WITH TAXES: $70.27 PS. Later while Googling, I noticed someone strongly suggesting to not remove the small wheel speed sensor bolt because they are often seized and will break the head off easily, making the job much bigger than planned. __________________ Russ McBride, [COLOR="Red"]Car Sold 8/2020[/COLOR] #1635, Marietta, GA USA, 1991 ZR-1, #766 (bought 1/1/2015) MS3-Pro, OBX, SW X-Pipe, Borla, Hurst, SLP, Goodyear F1 GS-D3, Kenwood. HOTB 2016Q3 [IMG]http://zr1.net/forum/picture.php?albumid=316&pictureid=2873[/IMG] [IMG]http://zr1.net/forum/picture.php?albumid=336&pictureid=2985[/IMG]

05-31-2015	#2
Mystic ZR-1 Join Date: Jan 2010 Location: Mystic CT Posts: 2,633	Re: Installing Longer Wheel Studs, rear hub - shortcut & tips. How long are the stock studs and the new ones?

05-31-2015	#3
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,456	Re: Installing Longer Wheel Studs, rear hub - shortcut & tips. Why are you installing longer studs?

06-04-2015	#5
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,074	Re: Installing Longer Wheel Studs, rear hub - shortcut & tips. When I had the GS wheels on my car I had to run longer studs,I think they were 2 inches from GM. I ground of the 1/4 of dead material from the threaded area and had to grind a flat on one side but they will slip in but you need to keep rotating to hub to get the right spot. I didn't need to grind on any part of the suspension. There's pictures in a thread here somewhere.