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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Brakes and Braking Systems => Topic started by: Cody the Roady on March 15, 2015, 03:26:55 pm

Title: Aftermarket Spindles and Rotors
Post by: Cody the Roady on March 15, 2015, 03:26:55 pm

I have a 1987 Chevy Silverado R10, 2WD. My mechanic gave me a set of drop spindles for free. I took off the old spindles and put on the new ones. However, after replacing the wheel bearings, the rotors do not fit all the way on. I have been researching the meaning of "1 inch or 1 1/4 inch" here and other places...and I'm still confused. I do not know the brand of the new spindles. My son "the expert" says I am replacing 1" spindles with 1 1/4" spindles. Does this mean I need 1 1/4" rotors? Does this also mean I will need new calipers? Thanks, guys.

Title: Re: Aftermarket Spindles and Rotors
Post by: jetmech on March 15, 2015, 11:45:23 pm

The reference to 1" vs 1 1/4" is the rotor thickness. The spindle, rotor and caliper have to be matched for one or the other. If you are removing spindles made for 1" rotors and replacing with 1 1/4" spindles then you will also need 1 1/4" rotors and calipers. When I do this conversion I also change to a dual diaphram brake booster and Suburban rear brakes and backing plates. This makes an excellent braking system for a half ton truck.

Title: Re: Aftermarket Spindles and Rotors
Post by: Cody the Roady on March 16, 2015, 11:50:46 am

Makes sense. Thanks for the response.

Title: Re: Aftermarket Spindles and Rotors
Post by: Captkaos on March 16, 2015, 12:27:35 pm

I thought I put a post in the tech section on the HD vs std brakes, but I don't see it...
I will try and get it posted, but as stated, if your spindles are for HD (1-1/4") brakes, you will need to change out your rotors/calipers

Title: Re: Aftermarket Spindles and Rotors
Post by: Cody the Roady on March 16, 2015, 03:52:58 pm

Looking closer at the spindle I have with me right now, it is stamped "C-10D" (I assume D is Driver's side), and "C10-HD", which I bet is, per Capt. Kaos, short for heavy duty. Now we're cookin' with gas! Again, I appreciate all y'all's help.

Title: Re: Aftermarket Spindles and Rotors
Post by: Captkaos on March 17, 2015, 09:29:41 pm

Posted the pic comparison...
http://forum.73-87chevytrucks.com/smforum/index.php?topic=30569

Title: Re: Aftermarket Spindles and Rotors
Post by: Cody the Roady on March 19, 2015, 03:31:38 pm

Thanks, Capt! Now, if I can only get my local parts store to understand this. I've shown them the new spindle. I've printed out y'all's explanation. I have just printed your pictures for a graphic display. I'm confident that, though I am mechanically deficient, explaining it correctly. Any advise on what I need to "say" to my parts guy? He seems to be under the impression that the HD spindle will require a different bolt pattern.

Title: Re: Aftermarket Spindles and Rotors
Post by: Captkaos on March 19, 2015, 06:34:01 pm

Tell them you need rotors for JB5 brakes

JB3 = power brakes, 1" rotors
JB5 = power brakes, 1.25" rotors

Title: Re: Aftermarket Spindles and Rotors
Post by: Cody the Roady on March 23, 2015, 02:39:07 pm

We have a success story! I finally got through to a local parts guy. Before him, everyone kept looking stuff up on their computer. Then came Steve, the manager at the local O'Reilly's. He pulled rotors and calipers out from the back and played with my spindles for an hour. They're on the truck now. Again, I thank you gentlemen for all the pics and answers. Now, on to the rear....