 Veryclere
"2nd Year" Gold Supporting Member
Posts: 71
Loc: N East Ohio
Reg: 12-13-20
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08-03-22 09:43 AM - Post#2845385
1968 Impala with some unknown and unidentifiable brake conversion. Broke TWO wheel studs on passenger front wheel! I have looked at the corvette posts for rotors/hubs. these are all 1/2" short or so and I cannot get the castle nut on the spindle! I did find the rotor on Rock auto but that doesn't get my wheels back on as I cannot locate these studs. The length below the cap/top is 1 7/8". the collar is 1/2" in dia and 5/16" long. the knurl starts there and looks to be 7/16" in dia at 1/2" long. threads are 1"long. see attached images.
My only other options that I can see are to do a complete conversion kit from a reputable source which I am estimating $600-$1100.
Been without the car for a while now and it is killing me. all over a couple snapped lugs.
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 toro455
"7th Year" Silver Supporting Member
Posts: 735
Loc: Western NY
Reg: 06-15-02
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08-03-22 03:27 PM - Post#2845400
In response to Veryclere
Could you post some photos of the other parts like the caliper, hub and rotor? Maybe someone will recognize what they came from.
I recall that Dorman had some sort of search where I could find different lug studs. My '68 has a combination of 1969 Impala and Corvette parts.
Scott
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Shepherd
Valued Contributor
Posts: 2631
Loc: Lake George, NY
Reg: 11-11-15
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08-03-22 05:21 PM - Post#2845404
In response to Veryclere
Pretty sure disc brakes were optional on the 68 Impala. Maybe search for that application. Are you running stock steel wheels?
Edited by Shepherd on 08-03-22 05:26 PM. Reason for edit: No reason given.
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toro455
"7th Year" Silver Supporting Member
Posts: 735
Loc: Western NY
Reg: 06-15-02
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08-03-22 07:34 PM - Post#2845411
In response to Shepherd
Front disc was an option in 1968. It used a dual piston caliper. In 1969 they went to a single piston. Someone may be able to tell what Veryclere has with some photos.
Good question regarding the wheels. I changed a car to aluminum wheels and I needed longer studs but they were metric. I think to find those though I knew the thread size and I searched. The search eventually lead to the Dorman site.
If the studs pictured are from an unknown set-up a good first step would be to identify the thread size with a thread gauge or calipers for the diameter and then making an imprint of the threads on some paper and calculating the pitch by counting threads over a distance.
Scott
Edit: I just looked at the photos again. Those do seem to be strange with a larger step before the spline/knurl.
Edited by toro455 on 08-03-22 07:37 PM. Reason for edit: No reason given.
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docjns1
"2nd Year" Gold Supporting Member
Posts: 291
Loc: upstate NY
Reg: 11-12-19
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08-04-22 01:46 PM - Post#2845445
In response to Veryclere
See the chart from my parts catalogue...closest appears to be the 3961225, 67-70 full size w/ disc brakes. also found a pic that looks very much like yours....check this link although it states out of stock and offers a replacement P#, the replacement does not appear to have the shoulder
https://www.oldsobsolete.com/products-page/chevy-p ...
Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif |
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 jktucker92
Silver Supporting Member
Posts: 535
Loc: West Richland, WA
Reg: 02-05-17
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08-04-22 07:01 PM - Post#2845469
In response to docjns1
Those look like the factory studs used from '67-'70. Check out the post below where it's discussed. They are not available new anymore, but I was able to find a set a couple years ago. Does your car have single or dual piston calipers. if they're dual piston calipers, the setup is probably stock, and your car probably came with them.
https://www.chevytalk.org/fusionbb/showtopic.php?t...
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Veryclere
"2nd Year" Gold Supporting Member
Posts: 71
Loc: N East Ohio
Reg: 12-13-20
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08-04-22 08:05 PM - Post#2845474
In response to jktucker92
First, and most importantly, thanks everyone. Incredible resources on this forum.
Just finding a part number was an incredible breakthrough.
I have a few other part numbers but little to go on. Driver side caliper, single piston; 5468316. Passenger side caliper 5468317. Driver side shield is 3953421-L. Passenger side is 3953422-R.
The older post shared was so very helpful as well. I will order the rotors from Rock auto to have; may use them now and save the original with the ring in them for “just in case.”
I found Raybestos 5003B in Canada at the Wrench Monkey and ordered 10. They appear the same but no measurements provided. For the price, I took the gamble. Sure hope shipping doesn’t take too long. Will follow up with this post with the outcome for sure. I found no other options (yet). Nothing else in stock anywhere. I will probably call Paulin to see if they have an option also.
I have new pads to install that should wear soft on the rotors. OReilley won’t even attempt to turn these.
My hubs were banged up by the PO. Does anyone know of the hub in the old post was a winner (again, just in case).
Thanks again.
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Veryclere
"2nd Year" Gold Supporting Member
Posts: 71
Loc: N East Ohio
Reg: 12-13-20
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08-05-22 08:42 AM - Post#2845494
In response to Veryclere
This just in. Canadian supplier has no stock of these wheel studs.
just going to have to convert the brake system in its entirety I guess.
very disappointed. deep breaths
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toro455
"7th Year" Silver Supporting Member
Posts: 735
Loc: Western NY
Reg: 06-15-02
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08-05-22 09:36 AM - Post#2845496
In response to Veryclere
Did we ever determine exactly what you have currently? You listed caliper PNs but I didn't know them off the top of my head.
I find it hard to believe someone, Dorman or other, doesn't have any acceptable lug stud. If it's a 68 with original dual piston brakes that was a fairly rare option and pretty cool.
You also have backing plates which often aftermarket kits are lacking. When I put the 69 brakes on my 68 I couldn't find any 69-70 backing plates and the donor parts I had looked pretty bad. It turns out the backing plates of that timeframe were made pretty well. They cleaned-up incredibly and I used them.
Until what you have is identified it's difficult to help further. I know I bought replacement studs for the hub assemblies I used. I also used longer studs. I know the hubs were from 69-82 Corvette. That's just an example. The 68 used a different spindle and smaller spindle bearing and it sounded like you may have original disc.
Once you found the PN did you try searching eBay? It's possible someone referenced the OE PN for even an aftermarket replacement. Before I changed everything I would get on the phone with Dorman if I couldn't find something. If you have the parts off is it obvious why there was a shoulder? I mean take a look at the mating part.
Scott
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docjns1
"2nd Year" Gold Supporting Member
Posts: 291
Loc: upstate NY
Reg: 11-12-19
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08-05-22 01:58 PM - Post#2845510
In response to toro455
quick google search on those #s and I find some remans for '68 Impalas, single piston with those casting #s....
From that fitment my parts catalogue gives P#s 5274813 LH, 5274814 RH, 68-70 full size (Impala, Caprice) single piston. that doesn't necessarily mean you have the matching hub/disc assemblies however. When I did my conversion I was able to retain the original drum brake spindles. I am in a similar position in that I don't know specifically what replacement parts I might ever need beyond the easily ID'd pads should the occasion arise
Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif |
Edited by docjns1 on 08-05-22 01:59 PM. Reason for edit: No reason given.
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toro455
"7th Year" Silver Supporting Member
Posts: 735
Loc: Western NY
Reg: 06-15-02
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08-05-22 08:12 PM - Post#2845530
In response to docjns1
The 68 only had dual piston and 69-70 only had single piston. The 68 and 69 also used a different wheel bearing. So if the listing says single piston they are not '68 unless the factory made a late model year change but that's not something I've ever heard mentioned.
So to me this was a conversion to the 69-70 disc brakes. I would keep that set-up. The spindles are common with Corvette. The steering arm is bolt-on. I used the 69 Impala steering arms I had but as I recall one of my donor spindle was damaged so I found a 69-82 Corvette spindle.
One of the forum members had a nice write-up on different hubs. That write-up didn't have the Corvette hubs which I used. The hubs are going to be difficult to identify without measurements but about 7 years ago I just bought Dorman studs and I had a choice of length.
I was doing front and rear and my notes are not perfectly clear but I can see that I bought Dorman PN 610-259 and the application I looked-up was 1975 Corvette with 5.7L. Some of the Corvettes used aluminum rims so maybe the ones I bought were longer for that reason. I would also say Dorman seems to place a dot and a number after the PN which seems to indicate quantity. So a pack on 1 would be 610-259.1 and 610-259.10 would be 10pcs. There are variations of the PN where some places eliminate the dash and just list as 610259.
I think the member who wrote the article I'm thinking of was something like mcj1. Maybe he will see your thread or you can search. He had photos of the differences of the 69 original parts and comments on the drum brake hubs.
Scott
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docjns1
"2nd Year" Gold Supporting Member
Posts: 291
Loc: upstate NY
Reg: 11-12-19
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08-06-22 09:57 AM - Post#2845537
In response to toro455
geee, I dunno....
Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif |
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toro455
"7th Year" Silver Supporting Member
Posts: 735
Loc: Western NY
Reg: 06-15-02
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08-06-22 10:20 AM - Post#2845538
In response to docjns1
Steve,
I think the listing is wrong. It does say with single piston though so if it is a mistake it would never really impact anyone if the option never existed for 68. I know the capture is a GM publication though so maybe they pulled ahead the single piston but if they did I suspect GM would have "chased" where to stop. For example the spindle changed from 68 to 69. In 69 the wheel bearing is larger. There are probably some people who are more historians on the site than I am but I've had my 68 for more than 30 years and in that time I've become aware of many specifics.
I have a friend with a 68 Chevelle and that had original dual piston. As I know that was also what was used on Corvette in 68.
Scott
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docjns1
"2nd Year" Gold Supporting Member
Posts: 291
Loc: upstate NY
Reg: 11-12-19
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08-07-22 07:17 PM - Post#2845590
In response to toro455
interesting observation...as my catalogue has an april 76 revision date I have noticed several areas where listings for a # of earlier years and models have simply been omitted. Looking deeper, there is a listing for rotors for 67-68 with "4 piston design" (perhaps police and or taxi as they were often heavier duty) as well as a different P# for 'single piston'
As to different spindle/hubs, the caliper wouldn't necessarily be different if the rotor diameter & thickness were the same under the assumption the knuckle/spindle would correct any change in offset, etc
Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif |
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