5 on 5 to 5 on 4 3/4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

batteryguy · 06-14-2008, 10:30 PM

Anybody ever convert their '72 Chevy pickup from 5 on 5 bolt pattern to 5 on 4 3/4? The back is easy. What did you do to convert the front discs?
I want to run Weld Pro Star type wheels and can't find 5 on 5.

**67 cst swb** · 06-15-2008, 02:37 AM

OK, find a 71-72 or 73-74 Chevy Van... get the complete spindle, rotor, caliper assy. They are the same upper/lower ball joint as well as same outer tie rod end, but they are 5 on 4-3/4 bolt pattern... the 71-72 van are the same components as 71-72 chevy trucks, and the 73-74 chevy van are the same components as 73- later chevy pickups... 75-later chevy van return to 5 on 5 bolt pattern.
The Rotor and Caliper are the same as a 70-77 chevy camaro...
I was warned once that the smaller camaro rotor/caliper does not have the stopping power needed for a truck. But, My opinion is the GM Factory guys must has thought they would stop a VAN and everything you could throw in one.

caminokid · 06-15-2008, 08:03 AM

Quote:

Originally Posted by 67 cst swb

OK, find a 71-72 or 73-74 Chevy Van... they are the same upper/lower ball joint as well as same outer tie rod end, but they are 5 on 4-3/4 bolt pattern... the 71-72 van are the same components as 71-72 chevy trucks, and the 73-74 chevy van are the same components as 73- later chevy pickups... 75-later chevy van return to 5 on 5 bolt pattern.
The Rotor and Caliper are the same as a 70-77 chevy camaro...
I was warned once that the smaller camaro rotor/caliper does not have the stopping power needed for a truck. But, My opinion is the GM Factory guys must has thought they would stop a VAN and everything you could throw in one.

I think that would be my issue. You cant get 12 inch drums for a Camaro. Smaller rotors may cause you to undo everything you have done by not being able to stop in time.

bigsnookmaster · 06-15-2008, 09:29 AM

I had a guy re-drill my rotors to the smaller pattern,He had to machine some material off the backside,but they worked well.

jorgensensc · 06-15-2008, 10:41 AM

Okay,
I did this, then converted back to 5x5. The rear drums can also be had from the front drums of a '56 Bel Air. They are the same part number as the rear drums on the van. I had 6 lug, so I ordered new rear axles from moser and had them drilled for both 5 x 5 and 5 x 4 3/4. I bought a set of rotors from a board member that were drilled for the 5 x 4 3/4 bolt pattern also, as well as retaining the 5 x5 pattern. It was pretty simple, but then plans changed, so I just moved the studs and was back in business with 5 x5.

06-14-2008, 10:30 PM	#1
batteryguy Registered User Join Date: May 2008 Location: Waukesha, WI Posts: 4	5 on 5 to 5 on 4 3/4 Anybody ever convert their '72 Chevy pickup from 5 on 5 bolt pattern to 5 on 4 3/4? The back is easy. What did you do to convert the front discs? I want to run Weld Pro Star type wheels and can't find 5 on 5.

06-15-2008, 02:37 AM	#2
67 cst swb Senior Member Join Date: Nov 2001 Location: Rapid City, SD Posts: 2,281	Re: 5 on 5 to 5 on 4 3/4 OK, find a 71-72 or 73-74 Chevy Van... get the complete spindle, rotor, caliper assy. They are the same upper/lower ball joint as well as same outer tie rod end, but they are 5 on 4-3/4 bolt pattern... the 71-72 van are the same components as 71-72 chevy trucks, and the 73-74 chevy van are the same components as 73- later chevy pickups... 75-later chevy van return to 5 on 5 bolt pattern. The Rotor and Caliper are the same as a 70-77 chevy camaro... I was warned once that the smaller camaro rotor/caliper does not have the stopping power needed for a truck. But, My opinion is the GM Factory guys must has thought they would stop a VAN and everything you could throw in one. __________________ My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White Last edited by 67 cst swb; 06-17-2008 at 11:09 PM.

06-15-2008, 09:29 AM	#4
bigsnookmaster Registered User Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,267	Re: 5 on 5 to 5 on 4 3/4 I had a guy re-drill my rotors to the smaller pattern,He had to machine some material off the backside,but they worked well. __________________ greg http://community.webshots.com/user/68406Stepside

06-15-2008, 10:41 AM	#5
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Re: 5 on 5 to 5 on 4 3/4 Okay, I did this, then converted back to 5x5. The rear drums can also be had from the front drums of a '56 Bel Air. They are the same part number as the rear drums on the van. I had 6 lug, so I ordered new rear axles from moser and had them drilled for both 5 x 5 and 5 x 4 3/4. I bought a set of rotors from a board member that were drilled for the 5 x 4 3/4 bolt pattern also, as well as retaining the 5 x5 pattern. It was pretty simple, but then plans changed, so I just moved the studs and was back in business with 5 x5. __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

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