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Old 11-16-2015, 01:16 AM   #1
cr1hotrod
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12 Bolt Brake/Axle Mismatch

Hey guys, I have an issue with a '67 I picked up the other day. I've been slowly going through it to make sure it's going to be reliable 'till I get a chance to really get into it. The truck has been pieced together from a few other trucks.

I put wheels and tires on it the other day at Discount Tire and one of the lugs started spinning and wouldn't tighten. Cut it off today and when I pulled the drum to put the new stud in I saw it was only contacting part of the shoe. Step in the shoe liner, untouched half of drum(see pics).

It's currently 5 lug. I'm guessing the PO stuck in some later longer axle shafts for the 5 lug. The axle flange sits pretty far away from the bearing. Need some input on where to go now. Should I be able to get the shorter ones...plug and play... or is there more involved?

Lets not get into all the wrong body parts discussion, lol. Unless someone has some fenders and a radiator support in Colorado. Already have a hood.

Any help would be apreciated
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Old 11-16-2015, 08:38 PM   #2
fleetsidelarry
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Re: 12 Bolt Brake/Axle Mismatch

someone put '71-'72 axles in the '67 housing most likely. axles got longer sometime in '67 IIRC and if your housing is early '67 the 5 bolt axles would be longer. '67 would have 6 bolt hubs, front and rear. they probably did the same for the front components. '67 would have drum brakes up front, '71-'72 would be discs. do you have discs up front?

you can buy new axles the correct length

here's one thread

http://67-72chevytrucks.com/vboard/s...06152&posted=1
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Last edited by fleetsidelarry; 11-16-2015 at 08:51 PM.
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Old 11-16-2015, 09:29 PM   #3
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Re: 12 Bolt Brake/Axle Mismatch

Yes, the fronts are 5 lug also. That's what I figured. I was more curious if I could just get the shorter 5 lug shafts. Briefly looking around last night I saw that Summit has a "kit" for it. The kit comes with spider gears and drums for $500. I know I don't need the drums and I would assume I don't need the gears. I would think I just need to get some short 5 lug shafts. Any ideas?
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Old 11-16-2015, 09:53 PM   #4
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Re: 12 Bolt Brake/Axle Mismatch

Oh yeah, Thanks for the link. I searched but didn't see that one.
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Old 11-16-2015, 10:23 PM   #5
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Re: 12 Bolt Brake/Axle Mismatch

There is also a problem with the bearings are not riding on the proper hardened axle surface that it is suppose to ride on.
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Old 11-16-2015, 11:01 PM   #6
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Re: 12 Bolt Brake/Axle Mismatch

Your truck has a 67-68 grille, but the rest of the front clip is 69-72.
See how the headlights don't fit?
What year truck is it suppose to be?
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Old 11-17-2015, 12:13 AM   #7
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Re: 12 Bolt Brake/Axle Mismatch

You do not need to change the spider gears along with the axles. The spider gears are required in the '63 & '64 12 bolts. The '65-'82 12 bolts already have 30 spline axles and spider gears. In late '70 the differential housing increased in width by 1.5".
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Old 11-17-2015, 08:00 AM   #8
fleetsidelarry
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Re: 12 Bolt Brake/Axle Mismatch

I was worried that I didn't remember the model-year change correctly, and I didn't. I was also hopeful that Captainfab would come along later and correct that in his usual non-critical fashion, which he did.

I know there are several sources for these axles, I just haven't had the need to remember them, but here's one, note that it does say that the axles are available separately:

http://www.classicperform.com/Store/...k/6364RACK.htm
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Old 11-17-2015, 02:05 PM   #9
GASoline71
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Re: 12 Bolt Brake/Axle Mismatch

I am swapping everything 5 lug from a 1972 GMC frame over to a 1969 C10 frame which is all 6 lug. The 1972 Axle housing is wide, and the 1969 axle housing is narrow just like your 1967. So I bought conversion axles from Moser that are the correct shorter length for the 1969 housing, but have 5 lugs like I want to convert over to the 5 lug setup on the truck.

http://www.summitracing.com/parts/msr-a3065gmt5

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Old 11-17-2015, 03:29 PM   #10
cr1hotrod
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Re: 12 Bolt Brake/Axle Mismatch

Thanks everyone for the input. That's exactly what I thought. Just had to get some other opinions.

Lolife99....Notice the last part of the original post...I knew someone would go there. Haha. It is a 67 by the vin and the bed doesn't have markers. Although there's allot of 72 in it, I'm going with 67.
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