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Old 09-29-2019, 10:51 PM   #26
regan56
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Re: 56 straight axle squarebody hubs

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I do want the 5on5...i guess the only things I'm not sure of is the bearings and the lugs..the rest i could piece together with no double guessing myself.

The bearings..This is probably the biggest concern i have.
https://www.speedwaymotors.com/1947-...ion,24928.html

Would these bearings work? I was going through the 'Parts included in this kit' list and the part number for the outer bearings took me to the bearing obviously but says it would t fit my -56 GMC?

Last edited by regan56; 09-29-2019 at 10:58 PM.
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Old 09-30-2019, 05:03 PM   #27
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Re: 56 straight axle squarebody hubs

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https://www.speedwaymotors.com/1947-...ion,24928.html

Would these bearings work? I was going through the 'Parts included in this kit' list and the part number for the outer bearings took me to the bearing obviously but says it would t fit my -56 GMC?
No, those are for your stock hubs. The disc brake kits come with bearings.
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Old 09-30-2019, 07:20 PM   #28
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Re: 56 straight axle squarebody hubs

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No, those are for your stock hubs. The disc brake kits come with bearings.
Ya I thought about that after a while. Thx for the confirmation. I have been piecing together the parts list and i can't do it for less than the overall kit price minus the master cylinder and booster. Only thing would need to get the different hubs and try and sell the ones from the overall kit

I should say im looking at the kit from Speedway again and piecing that together. That kit was like 269.00 without the booster and cylinder.

Last edited by regan56; 09-30-2019 at 08:57 PM.
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Old 10-05-2019, 02:23 PM   #29
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Re: 56 straight axle squarebody hubs

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All kits use the 70-78 Camaro rotor. Speedway has them drilled in different patterns. The rotor does not fit your spindles directly, an inner bearing adaptor has to be used. It's either the 70-78 Camaro rotors or the 6 lug kit that re-uses your drum hubs, that's all that is available for your stock spindles.
You might find a 1/2" lug stud with a knurl that could be used to substitute the 5/8 studs but you won't know that until you have the rotors in hand and measure the existing hole size. If you want 5 on 5 that's what your choices are.
If you're using alum wheels you can redrill the holes for the larger size, should be done on a vertical mill
Ive found several different 1/2-20 studs with various knurl diameters. .57" .67" some .62".

Any best guess as to the hole diameter left by the 5/8" studs?
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Old 10-05-2019, 09:46 PM   #30
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Re: 56 straight axle squarebody hubs

You'll never know without buy the rotors and measuring the hole. Definitely larger then 5/8"
What kind of wheels are you going to use? Alum can be drilled for the larger 5/8 studs
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Old 10-06-2019, 09:40 AM   #31
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Re: 56 straight axle squarebody hubs

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You'll never know without buy the rotors and measuring the hole. Definitely larger then 5/8"
What kind of wheels are you going to use? Alum can be drilled for the larger 5/8 studs
Squarebody Chevy rallies..
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Old 10-06-2019, 10:12 AM   #32
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Re: 56 straight axle squarebody hubs

Those wheels came off trucks that used 1/2" studs so maybe a 5/8 stud will fit, you need to check that. Also I would call Speedway and ask if they make the rotor with smaller then 5/8" studs, navigating their website isn't so easy.
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Old 10-06-2019, 03:08 PM   #33
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Re: 56 straight axle squarebody hubs

Since I use that same rotor (5 on 4.75") for my early car kits I'll take a look and see if there is any possibility of re-drilling it, maybe you'll catch a break.
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Old 10-06-2019, 03:48 PM   #34
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Re: 56 straight axle squarebody hubs

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Those wheels came off trucks that used 1/2" studs so maybe a 5/8 stud will fit, you need to check that. Also I would call Speedway and ask if they make the rotor with smaller then 5/8" studs, navigating their website isn't so easy.
Bought a 5/8 bolt to check..no luck. Its too large.

Ill call SW and see if they can help. The online request response was absolutely no help.

I guess im just baffled as to why this is such a difficult thing to hunt down?
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Old 10-06-2019, 05:32 PM   #35
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Re: 56 straight axle squarebody hubs

As I suspected, absolutely no way you can re-drill. The rotors have a strengthening rib between each lug. They have to be made from new with a different mold.
Hard to find because it's very special purpose and not in any demand. It's surprising to me that Speedway even bothers with them but then they're into the off road crowd.
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Old 10-07-2019, 03:38 PM   #36
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Re: 56 straight axle squarebody hubs

You can check if the holes can be drilled out (which they can) AND the correct taper machined back so the nuts seat properly.
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Old 10-09-2019, 10:07 AM   #37
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Re: 56 straight axle squarebody hubs

i may just abort the 5on5. it seems like a friggin hassle ill have to do when i need to replace the front brakes anyway. i wanted teh 5on5 because thats the rims i had (kinda backwards, but had i known its not as easy to find teh right hubs ..)

i guess at this point i have 2 options for 5x4.75:

1. find a rearend from an late 70's firebird / camaro, tidy it up and slide that in
2. replace the axles and brake drums in my rebuilt (complete new brakes, axle seals and a coat of paint) SB axle (3.07 gears)
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Old 10-09-2019, 01:13 PM   #38
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Re: 56 straight axle squarebody hubs

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i may just abort the 5on5. it seems like a friggin hassle ill have to do when i need to replace the front brakes anyway. i wanted teh 5on5 because thats the rims i had (kinda backwards, but had i known its not as easy to find teh right hubs ..)

i guess at this point i have 2 options for 5x4.75:

1. find a rearend from an late 70's firebird / camaro, tidy it up and slide that in
2. replace the axles and brake drums in my rebuilt (complete new brakes, axle seals and a coat of paint) SB axle (3.07 gears)

so looking into option 1. i have found a 10 bolt rear end housing for a "early 70's" camaro for $30. its just a shell and axle tubes, no brakes or gears or axles..just the case.

will the ring and pinion from my truck RE work in there? id have to purchase the axles and brakes and seals etc, but was probably going to have to anyway...

this thread has taken a turn 180 degrees. ill probably start a new one.
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Old 10-10-2019, 01:59 PM   #39
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Re: 56 straight axle squarebody hubs

Before you give up. I was researching wheel studs. Typical ARP and Moroso 5/8 studs have knurls from .660 to .685
Moroso has a 1/2" set that has .685" knurl, just might work #46490

It would be nice if Speedway could tell you what the knurl size is but I doubt it.
Worst case buy one rotor and pop a stud out and measure the knurl
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Old 10-10-2019, 05:39 PM   #40
regan56
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Re: 56 straight axle squarebody hubs

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Originally Posted by mgchevyparts View Post
Before you give up. I was researching wheel studs. Typical ARP and Moroso 5/8 studs have knurls from .660 to .685
Moroso has a 1/2" set that has .685" knurl, just might work #46490

It would be nice if Speedway could tell you what the knurl size is but I doubt it.
Worst case buy one rotor and pop a stud out and measure the knurl
im guessing the holes in the rotors dont distort? i mean ya i could buy one and check it...its not like i don have a ton of other useless truck metal in the garage
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Old 10-10-2019, 05:54 PM   #41
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Re: 56 straight axle squarebody hubs

The ideal situation is the hole in the rotor is slightly smaller then your available knurl on the 1/2" stud. Then you can buy a dimensional ream in the correct size and carefully ream the hole to proper size. Insert studs with care also. If the 5/8 studs have the exact same size knurl as your replacement studs they'll probably press in but there is a risk that they could be loose. You just have to take some caution with cast iron, careless handling could mess up the hole.
It would be nice if Speedway knew the stud size but I kind of doubt it.
That .685" knurl is large and I think there is a good chance the 5/8 stud may be smaller. I'm basing my opinion on what I see listed at Summit for studs in those sizes. If the hole is smaller you want about 5 to 10 thou press fit between hole and knurl
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Old 10-10-2019, 06:51 PM   #42
regan56
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Re: 56 straight axle squarebody hubs

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The ideal situation is the hole in the rotor is slightly smaller then your available knurl on the 1/2" stud. Then you can buy a dimensional ream in the correct size and carefully ream the hole to proper size. Insert studs with care also. If the 5/8 studs have the exact same size knurl as your replacement studs they'll probably press in but there is a risk that they could be loose. You just have to take some caution with cast iron, careless handling could mess up the hole.
It would be nice if Speedway knew the stud size but I kind of doubt it.
That .685" knurl is large and I think there is a good chance the 5/8 stud may be smaller. I'm basing my opinion on what I see listed at Summit for studs in those sizes. If the hole is smaller you want about 5 to 10 thou press fit between hole and knurl
thx mgchevy

i guess ive kinda already talked myself into the 5*4.75 pattern. i cab get the rear end for relatively cheap, get the speedway front end drum to disc kit and save the rebuilt truck rearened for another project or sell it to finance a portion of the work
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