Disc conversion questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

joecarquest · 10-05-2021, 07:38 PM

What to add disc brakes to my 1966 c20.
Found this thread

63-66 Crossmember Installed:
1) There are many advantage to leaving your 63-66 crossmember in place to add disc brakes.

2) 63-66 truck owners can now purchase "year specific" standard and drop spindles, from many aftermarket suspension vendors.
* No need to change ball joints.
* No need to change tie rod ends.
* These new "conversion disc brake spindles" are a true "bolt-on" mod to add disc brakes to your truck.

Summit racing has Classic Performance CP4S9 - Classic Performance Spindles disc conversion stock hight 1966 c20 year specific parts.
Been looking at threads so far haven't found anybody that has tried these or something simalar. Any info would be greatly appreciated.
Thanks

**The Rocknrod** · 10-06-2021, 07:56 AM

I kept mine. After driving around my new build I don't get why you need to change. I can see the torsion bar guys need, but...

**caseyjones** · 10-06-2021, 02:17 PM

You mention you have a C20…do you want to keep the 8-lug wheels?

The spindle part number you quote is for a C10 and won’t work with your C20.

I have first hand experience on my GMC with conversion spindles that work with 3/4 ton ball joints/tie rods but uses 1/2 ton brake parts. But I don’t know if that’s what you are trying to do.
—Casey

joecarquest · 10-06-2021, 04:18 PM

Thanks I'll double check

Guess I'm still looking for spindles

**cwcarpenter98** · 10-06-2021, 05:24 PM

I haven't looked at the aftermarket companies for a disc spindle that works with the factory 63-66 ball joints and keeps the truck 8 lug.

If that spindle does exist, that's news to me. If it doesn't, your next best option is a stock spindle from a 71-72 or 73-91 3/4 ton, which looks like it requires the whole crossmember because of how the LCAs mount to the 63-66 arms

**caseyjones** · 10-06-2021, 05:50 PM

Performance Online sells a C20 kit to keep 8 lugs on a 63-70 truck. I’d give them a call…

joecarquest · 10-06-2021, 06:06 PM

I've been looking for hours no spindle igsist that I found.

Thanks

**caseyjones** · 10-06-2021, 07:34 PM

https://www.performanceonline.com/19...-8-Lug-Deluxe/

(Edited, I had the wrong link)

This kit uses the Western Chassis spindles. You can use your original crossmember but it looks like you do have to swap out the ball joints and tie rod ends. I’ve found that both of my trucks needed these parts replaced anyway.

10-05-2021, 07:38 PM	#1
joecarquest Registered User Join Date: Nov 2014 Location: san diego ca Posts: 26	Disc conversion questions What to add disc brakes to my 1966 c20. Found this thread 63-66 Crossmember Installed: 1) There are many advantage to leaving your 63-66 crossmember in place to add disc brakes. 2) 63-66 truck owners can now purchase "year specific" standard and drop spindles, from many aftermarket suspension vendors. * No need to change ball joints. * No need to change tie rod ends. * These new "conversion disc brake spindles" are a true "bolt-on" mod to add disc brakes to your truck. Summit racing has Classic Performance CP4S9 - Classic Performance Spindles disc conversion stock hight 1966 c20 year specific parts. Been looking at threads so far haven't found anybody that has tried these or something simalar. Any info would be greatly appreciated. Thanks

10-06-2021, 07:56 AM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Disc conversion questions I kept mine. After driving around my new build I don't get why you need to change. I can see the torsion bar guys need, but... __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

10-06-2021, 02:17 PM	#3
caseyjones Senior Member Join Date: Nov 2013 Location: Portland, OR Posts: 555	Re: Disc conversion questions You mention you have a C20…do you want to keep the 8-lug wheels? The spindle part number you quote is for a C10 and won’t work with your C20. I have first hand experience on my GMC with conversion spindles that work with 3/4 ton ball joints/tie rods but uses 1/2 ton brake parts. But I don’t know if that’s what you are trying to do. —Casey __________________ 1955 Long Distance Build 1964 GMC Palomino Tan Survivor 1964 C10 Survivor - Sold

10-06-2021, 04:18 PM	#4
joecarquest Registered User Join Date: Nov 2014 Location: san diego ca Posts: 26	Re: Disc conversion questions Thanks I'll double check Guess I'm still looking for spindles Last edited by joecarquest; 10-06-2021 at 04:59 PM.

10-06-2021, 05:24 PM	#5
cwcarpenter98 Senior Member Join Date: Jan 2018 Location: Hickory Flat, GA Posts: 4,491	Re: Disc conversion questions I haven't looked at the aftermarket companies for a disc spindle that works with the factory 63-66 ball joints and keeps the truck 8 lug. If that spindle does exist, that's news to me. If it doesn't, your next best option is a stock spindle from a 71-72 or 73-91 3/4 ton, which looks like it requires the whole crossmember because of how the LCAs mount to the 63-66 arms __________________ Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit 1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed 1995 Dodge Dakota Sport "I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson

10-06-2021, 05:50 PM	#6
caseyjones Senior Member Join Date: Nov 2013 Location: Portland, OR Posts: 555	Re: Disc conversion questions Performance Online sells a C20 kit to keep 8 lugs on a 63-70 truck. I’d give them a call… __________________ 1955 Long Distance Build 1964 GMC Palomino Tan Survivor 1964 C10 Survivor - Sold

10-06-2021, 06:06 PM	#7
joecarquest Registered User Join Date: Nov 2014 Location: san diego ca Posts: 26	Re: Disc conversion questions I've been looking for hours no spindle igsist that I found. Thanks

10-06-2021, 07:34 PM	#8
caseyjones Senior Member Join Date: Nov 2013 Location: Portland, OR Posts: 555	Re: Disc conversion questions https://www.performanceonline.com/19...-8-Lug-Deluxe/ (Edited, I had the wrong link) This kit uses the Western Chassis spindles. You can use your original crossmember but it looks like you do have to swap out the ball joints and tie rod ends. I’ve found that both of my trucks needed these parts replaced anyway. __________________ 1955 Long Distance Build 1964 GMC Palomino Tan Survivor 1964 C10 Survivor - Sold

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