Front Disc's Rubbing on Lower A-Arm - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**steveb64** · 03-28-2010, 08:41 PM

I installed CPP modular drop spindles on my '64 C10 and have run into a problem. The disc's I bought are the standard 11" or 12" 6-lug also from CPP. The problem I am having is the very end of the a-arm rubs on the disc. At first I thought maybe I hadn't seated the lower ball joint all the way, but I had and it's torqued to specs. Another thought is that the spindles were not machined correctly by CPP. Anyone else had this issue? I appreciate any insight you may have or ideas on how to fix.

**steveb64** · 03-28-2010, 08:57 PM

Now that I think about it a little, when I put the disc's on the spindles, I thought it was strange that the castle nut went on the spindle beyond the hole for the cotter pin. I had to add a second spindle washer to space the castle nut out on the spindle so the cotter pin would keep it from spinning. I think the spindles were not machined properly.

**lolife99** · 03-28-2010, 10:39 PM

You might PM member CPPJEFF.
I never knew how CPP narrowed the track width,... without running into this problem.
I know their "modular" spindles are only a 2" drop compared to the standard 2.5" or 3" drop.
Are you sure you have the correct bearings?

**steveb64** · 03-28-2010, 10:59 PM

lolife99,
The rotors came with the inner and outer races installed. The bearings fit the spindle fine, I guess it's possible that the races do not match my A3 and A5 bearings, but they looked fine when dry fitted. Maybe the rotors are out of spec.
I sent Jeff a message, we'll see what he suggests.
Thanks for the feedback.

**lolife99** · 03-28-2010, 11:16 PM

I'll be following this thread also.

royo · 03-28-2010, 11:48 PM

Didn't spray bomb have this problem with his spindles

*CPPJEFF* · 03-29-2010, 10:26 AM

I have NEVER seen this problem. Can you put the whhels on the vehicle instead of jackstands and let me see what it looks like then? I will send this thread over to my engineer. Thanks

**lolife99** · 03-29-2010, 11:40 AM

The area marked in red,... looks wider than the 67-72 or 73-87 lower arms.
I wonder if the early arms are different?

*CPPJEFF* · 03-29-2010, 12:01 PM

Quote:

Originally Posted by lolife99

The area marked in red,... looks wider than the 67-72 or 73-87 lower arms.
I wonder if the early arms are different?

I agree with lolife on the a-arm, although this should work on any a-arm from 63-87 chevy 1/2 truck.

*CPPJEFF* · 03-29-2010, 12:12 PM

Does this do this on both sides?

**steveb64** · 03-29-2010, 01:12 PM

Jeff,
Yes, this is happening on both sides.
I'll get some shots with the wheels on the ground in the garage and post them tonight.
Would this have something to do with the rotor going on the spindle so far that the cotter pin hole does not engage the crown nut? Should there be a spacer between the spindle and the inner bearing to hold the rotor out a bit?
I appreciate the help in getting this resolved.
If you need me to measure anything, I can do that.
Steve B.
563-320-1993

*CPPJEFF* · 03-29-2010, 01:32 PM

Quote:

Originally Posted by steveb64

Jeff,
Yes, this is happening on both sides.
I'll get some shots with the wheels on the ground in the garage and post them tonight.
Would this have something to do with the rotor going on the spindle so far that the cotter pin hole does not engage the crown nut? Should there be a spacer between the spindle and the inner bearing to hold the rotor out a bit?
I appreciate the help in getting this resolved.
If you need me to measure anything, I can do that.
Steve B.
563-320-1993

Steve i would appreciate that as far as putting it on the ground and getting some pics. Also the rotor goes right on without spacers. Thanks. My direct e-mail is jeff@classicperform.com

**steveb64** · 03-29-2010, 09:21 PM

Jeff - I sent you an e-mail with these pics. Thanks for your help with solving this issue.

For those interested in this thread, here you go.

**steveb64** · 03-31-2010, 12:31 PM

Decided I'm just going to grind off the ends of my a-arms to prevent them from grinding on the rotors. Don't want to take too much though and risk weakening the ball joint area of the stamping.

*CPPJEFF* · 03-31-2010, 01:29 PM

Quote:

Originally Posted by steveb64

Decided I'm just going to grind off the ends of my a-arms to prevent them from grinding on the rotors. Don't want to take too much though and risk weakening the ball joint area of the stamping.

Let me know how this turns out. I have NEVER seen this before.

fishingjred73 · 05-19-2010, 06:31 PM

Anymore on this?

swappy · 05-26-2010, 07:48 PM

I would like to know what the problem was. I want to get these for my truck. I wonder if he got the wrong bearing or rotors

Hottrucks · 05-26-2010, 08:26 PM

Hmmm I seem to have read this somewhere before but it is and older post.....I thnk they just ground it till it cleared??

what about thethickness of the rotor?? seems like they came in 2 diff thickenss's

**steveb64** · 05-28-2010, 01:45 PM

The rotors came from CPP. The bearings are the correct ones for the application, very common bearings.

I ended up just grinding the ends of my lower A-arms enough so that they no longer rub. I actually had to take quite a bit off, I'm hoping they are still mechanically sound and safe.

In my opinion, I should have forced the issue more with CPP. I think the CPP drop spindles were not machined correctly. This allowed the rotors to install to far inboard on the spindles. The reason I believe this is that after I installed the rotors, the crown nut tightens up way beyond the hole in the spindle that the cotter pin goes into. I had to install extra spindle washers between the outer bearings and the spindle nut to hold it our far enough so that the cotter pin will keep the crown nut from loosening.

I have to say, I'm not really happy with this setup, I just did not want to incur more shipping charges and down time sending the spindles back to CPP for inspection and replacement.

**LostMy65** · 11-22-2014, 04:08 AM

Old thread.....
But still interesting information on modular spindles.

**michael bustamante** · 11-26-2014, 12:37 AM

Did anyone notice theres no dust plates either? The spindles must be wrong if the rotor runs so far back that the castle nut completly clears the cotter pin hole

YBNORML · 11-26-2014, 03:19 AM

Quote:

Originally Posted by michael bustamante

Did anyone notice theres no dust plates either? The spindles must be wrong if the rotor runs so far back that the castle nut completly clears the cotter pin hole

I read on here that you can't run the dust shields with the modular spindles.

**michael bustamante** · 11-27-2014, 10:36 PM

Youre probably right. I ran magoughys and those had the holes to mount dust plates so i just assumed

Slow Build · 11-28-2014, 10:41 PM

Here is a recent pic from a thread by Chevy_Mike showing modular spindle with 15" rally wheels. Looks like the ball joint is taller or something. No interference between a-arm & disk.

**LostMy65** · 11-28-2014, 10:52 PM

Quote:

Originally Posted by Slow Build

Here is a recent pic from a thread by Chevy_Mike showing modular spindle with 15" rally wheels. Looks like the ball joint is taller or something. No interference between a-arm & disk.

Good observation.
The distance from the arm to the bottom of the spindle looks to be quite a bit more on Chevy_Mikes'.
The pics above, where the poster says he's having clearance issues, looks to only be about 1/2".

03-28-2010, 08:41 PM	#1
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Front Disc's Rubbing on Lower A-Arm I installed CPP modular drop spindles on my '64 C10 and have run into a problem. The disc's I bought are the standard 11" or 12" 6-lug also from CPP. The problem I am having is the very end of the a-arm rubs on the disc. At first I thought maybe I hadn't seated the lower ball joint all the way, but I had and it's torqued to specs. Another thought is that the spindles were not machined correctly by CPP. Anyone else had this issue? I appreciate any insight you may have or ideas on how to fix. Attached Images

03-28-2010, 08:57 PM	#2
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Re: Front Disc's Rubbing on Lower A-Arm Now that I think about it a little, when I put the disc's on the spindles, I thought it was strange that the castle nut went on the spindle beyond the hole for the cotter pin. I had to add a second spindle washer to space the castle nut out on the spindle so the cotter pin would keep it from spinning. I think the spindles were not machined properly.

03-28-2010, 10:39 PM	#3
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,684	Re: Front Disc's Rubbing on Lower A-Arm You might PM member CPPJEFF. I never knew how CPP narrowed the track width,... without running into this problem. I know their "modular" spindles are only a 2" drop compared to the standard 2.5" or 3" drop. Are you sure you have the correct bearings? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 03-28-2010 at 11:15 PM.

03-28-2010, 10:59 PM	#4
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Re: Front Disc's Rubbing on Lower A-Arm lolife99, The rotors came with the inner and outer races installed. The bearings fit the spindle fine, I guess it's possible that the races do not match my A3 and A5 bearings, but they looked fine when dry fitted. Maybe the rotors are out of spec. I sent Jeff a message, we'll see what he suggests. Thanks for the feedback.

03-28-2010, 11:16 PM	#5
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,684	Re: Front Disc's Rubbing on Lower A-Arm I'll be following this thread also. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 03-28-2010 at 11:17 PM.

03-28-2010, 11:48 PM	#6
royo Registered User Join Date: Feb 2007 Location: knoxville tn Posts: 1,013	Re: Front Disc's Rubbing on Lower A-Arm Didn't spray bomb have this problem with his spindles __________________ nickle and dime

03-29-2010, 10:26 AM	#7
CPPJEFF Account Suspended Join Date: Jan 2010 Location: Anaheim California Posts: 713	Re: Front Disc's Rubbing on Lower A-Arm I have NEVER seen this problem. Can you put the whhels on the vehicle instead of jackstands and let me see what it looks like then? I will send this thread over to my engineer. Thanks

03-29-2010, 11:40 AM	#8
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,684	Re: Front Disc's Rubbing on Lower A-Arm The area marked in red,... looks wider than the 67-72 or 73-87 lower arms. I wonder if the early arms are different? Attached Images __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-29-2010, 12:12 PM	#10
CPPJEFF Account Suspended Join Date: Jan 2010 Location: Anaheim California Posts: 713	Re: Front Disc's Rubbing on Lower A-Arm Does this do this on both sides?

03-29-2010, 01:12 PM	#11
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Re: Front Disc's Rubbing on Lower A-Arm Jeff, Yes, this is happening on both sides. I'll get some shots with the wheels on the ground in the garage and post them tonight. Would this have something to do with the rotor going on the spindle so far that the cotter pin hole does not engage the crown nut? Should there be a spacer between the spindle and the inner bearing to hold the rotor out a bit? I appreciate the help in getting this resolved. If you need me to measure anything, I can do that. Steve B. 563-320-1993

03-29-2010, 09:21 PM	#13
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Re: Front Disc's Rubbing on Lower A-Arm Jeff - I sent you an e-mail with these pics. Thanks for your help with solving this issue. For those interested in this thread, here you go. Attached Images

03-31-2010, 12:31 PM	#14
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Re: Front Disc's Rubbing on Lower A-Arm Decided I'm just going to grind off the ends of my a-arms to prevent them from grinding on the rotors. Don't want to take too much though and risk weakening the ball joint area of the stamping.

05-19-2010, 06:31 PM	#16
fishingjred73 Registered User Join Date: May 2007 Location: LOUISIANA Posts: 811	Re: Front Disc's Rubbing on Lower A-Arm Anymore on this? __________________ James '68 Stepside (ground up in progress) My 68 build thread http://louisianaclassictruckclub.fre...side-t956.html '81 SWB "Pap paw" (Driver) The 81 build thread http://louisianaclassictruckclub.fre...-swb-t960.html Member of www.louisianaclassictruckclub.com https://www.facebook.com/groups/296290610747732/

05-26-2010, 07:48 PM	#17
swappy Registered User Join Date: Nov 2008 Location: Rapid City SD Posts: 36	Re: Front Disc's Rubbing on Lower A-Arm I would like to know what the problem was. I want to get these for my truck. I wonder if he got the wrong bearing or rotors __________________ Rick 71 C10 long fleet sold 72 C10 short fleet 72 Olds cutlass 85 442 87 442

05-26-2010, 08:26 PM	#18
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Front Disc's Rubbing on Lower A-Arm Hmmm I seem to have read this somewhere before but it is and older post.....I thnk they just ground it till it cleared?? what about thethickness of the rotor?? seems like they came in 2 diff thickenss's Last edited by Hottrucks; 05-26-2010 at 08:27 PM.



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05-28-2010, 01:45 PM	#19
steveb64 Active Member Join Date: Oct 2009 Location: Moline, IL Posts: 157	Re: Front Disc's Rubbing on Lower A-Arm The rotors came from CPP. The bearings are the correct ones for the application, very common bearings. I ended up just grinding the ends of my lower A-arms enough so that they no longer rub. I actually had to take quite a bit off, I'm hoping they are still mechanically sound and safe. In my opinion, I should have forced the issue more with CPP. I think the CPP drop spindles were not machined correctly. This allowed the rotors to install to far inboard on the spindles. The reason I believe this is that after I installed the rotors, the crown nut tightens up way beyond the hole in the spindle that the cotter pin goes into. I had to install extra spindle washers between the outer bearings and the spindle nut to hold it our far enough so that the cotter pin will keep the crown nut from loosening. I have to say, I'm not really happy with this setup, I just did not want to incur more shipping charges and down time sending the spindles back to CPP for inspection and replacement.

11-22-2014, 04:08 AM	#20
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,497	Re: Front Disc's Rubbing on Lower A-Arm Old thread..... But still interesting information on modular spindles. __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

11-26-2014, 12:37 AM	#21
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,818	Re: Front Disc's Rubbing on Lower A-Arm Did anyone notice theres no dust plates either? The spindles must be wrong if the rotor runs so far back that the castle nut completly clears the cotter pin hole __________________ 1967custom

11-27-2014, 10:36 PM	#23
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,818	Re: Front Disc's Rubbing on Lower A-Arm Youre probably right. I ran magoughys and those had the holes to mount dust plates so i just assumed __________________ 1967custom

11-28-2014, 10:41 PM	#24
Slow Build Registered User Join Date: Sep 2009 Location: California Delta Posts: 2,163	Re: Front Disc's Rubbing on Lower A-Arm Here is a recent pic from a thread by Chevy_Mike showing modular spindle with 15" rally wheels. Looks like the ball joint is taller or something. No interference between a-arm & disk. Attached Images __________________ Name: Rich Current Ride: 1964 C-10 Short Fleetside Daily Driver: 2005 GMC crew cab short fleetside /2001 Chevy Tahoe Past GM Trucks: 1959 GMC short stepside 1968 GMC short stepside-4x4 1973 Chevy short stepside 1989 Chevy short fleetside-reg cab 1993 Chevy short fleetside-Xcab 2002 Chevy short fleetside-Xcab Save the dinosaurs, use synthetic oil.

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