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#1 |
Registered User
![]() Join Date: Jan 2007
Location: Scottsdale Arizona
Posts: 125
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1972 C30 dually drop spindle install HELP!!
Hi all, I've looked around but cannot seem to find a definitive answer.
I just started installing my drop spindles from Bell Tech this morning and all is going well until I noticed the brake caliper mount is very different. The spindles are listed as 75-91 and they dropped right onto my ball joints with no issue. haven't gotten to mounting the rotor yet and hope there are no surprises there as well. These new spindles seem to need a separate mount cradle for the caliper that is not in my possession. I bought them used but in like new condition. Anyone know what I'm up against? |
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#2 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,518
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Re: 1972 C30 dually drop spindle install HELP!!
What part number did you get? Should have been 3500
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#3 |
Registered User
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Location: Scottsdale Arizona
Posts: 125
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Re: 1972 C30 dually drop spindle install HELP!!
They are. Trying to upload picture from my phone but won't cooperate.
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#4 |
Registered User
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Location: Scottsdale Arizona
Posts: 125
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Re: 1972 C30 dually drop spindle install HELP!!
Here are two pix. the caliper mounts are different.
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#5 |
Registered User
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Location: Scottsdale Arizona
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Re: 1972 C30 dually drop spindle install HELP!!
Looking online, I find a different caliper that is JB8 style? requires a cradle type mount that bolts to the caliper. I'm assuming this is what I need for these drop spindles. Anyone know if that style will work with my rotor or do I need to upgrade that as well??
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#6 |
Registered User
Join Date: Dec 2014
Location: Coal City, IL
Posts: 695
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Re: 1972 C30 dually drop spindle install HELP!!
Chevy has two different caliper, one single piston, and one dual piston. They also have two different rotors. Looks like your new spindles are for the bigger brakes. Dual piston calipers with the thicker 1 1/4" rotors. You will most likely need new caliper and rotors that go with those spindles.
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Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker |
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#7 |
Registered User
Join Date: Dec 2014
Location: Coal City, IL
Posts: 695
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Re: 1972 C30 dually drop spindle install HELP!!
Oh, and the brakes hoses are different between the two calipers.
__________________
Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker |
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#8 |
Registered User
![]() Join Date: Jan 2007
Location: Scottsdale Arizona
Posts: 125
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Re: 1972 C30 dually drop spindle install HELP!!
I'll explore that avenue as well, thank you.
The spindles are for 75-91 according to the part number on them. My original rotors and ball joints fit as they should. The caliper is the only difference. |
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#9 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,518
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Re: 1972 C30 dually drop spindle install HELP!!
Those are not 1 ton calipers, they are 3/4 ton. Even the 1 ton is has a single piston caliper. AND as stated, you will need different hoses.
Are you sure it is a real 1 ton truck? Or something somebody put a dually rear end under. |
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#10 |
Registered User
![]() Join Date: Jan 2007
Location: Scottsdale Arizona
Posts: 125
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Re: 1972 C30 dually drop spindle install HELP!!
All original 1972 C30 dually with 12' flatbed.
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#11 |
Registered User
Join Date: May 2011
Location: Fort Worth, Texas
Posts: 468
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Re: 1972 C30 dually drop spindle install HELP!!
Did you ever find the right caliper that fits those dropped spindles? I'm having the same problem and the guys at Belltech were of no help. One even told me that the Bel-3500 was not intended to be used in a dually application. Strange how so many places advertise these spindles for duallys but they used what is called a clip on caliper.
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#12 |
Registered User
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Location: Scottsdale Arizona
Posts: 125
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Re: 1972 C30 dually drop spindle install HELP!!
Yes, its the JB8 code calipers. They are the clip style and the trouble I had was with some castings that I got from the local auto parts store had an issue. They had material added and then machined the surface and it was a poor job. I went to NAPA and bought a set and they went on but if you aren't familiar with them, they can be a little tricky. As far as the spindle not fitting, I had no problem. They bolted right on to my ball joints with no issue. My truck is a 72 but I have no idea if the control arms had ever been swapped out with later model ones, I do not believe they have been. I sourced later model dually rotors as mine were pretty worn and the new ones had a good 1/4" of meat on them and were off a truck with the JB8 brakes. got them turned and put new bearings in and they slid right on. I have not driven the truck but around the block because it still needs other work but it does stop real good from 25 mph now
![]() I hope this helps. Shoot me a message if you have any other questions, I'd be happy to lend a hand. |
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#13 |
Registered User
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Location: Scottsdale Arizona
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Re: 1972 C30 dually drop spindle install HELP!!
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#14 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,963
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Re: 1972 C30 dually drop spindle install HELP!!
Quote:
Check the center bore of your wheels & compare it to the hub. Those look like 99-later wheels which have a larger bore vs 71-98 trucks. Might be an issue you haven't realized w/the limited drive time.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#15 |
Registered User
![]() Join Date: Jan 2007
Location: Scottsdale Arizona
Posts: 125
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Re: 1972 C30 dually drop spindle install HELP!!
Good eye on that one. I have had them on it for a while and did notice a little wobble at certain speeds. I've figured out I need hub centric rings to take up the slack just haven't gotten them yet.
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