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

ratrod67 · 03-30-2003, 06:07 PM

I have a 69 Chevy with 6 lug and drum brakes. I just bought a 72 Chevy rolling chassis with 5 lug and disc brakes. I have a few questions about swapping the parts over.

1-What is the easiest method to do this swap. I've heard about swapping crossmembers and was wondering how to do this.

2- The 72 is missing the brake booster and master cylinder. Can I set it up as manual disc or is the power booster required. Can anyone tell me the proper length push rod?

3-Can someone show a picture of the proportioning valve? There are 3 different valves in the back of the truck and I'm wondering if I have the right one.

Thanks for any and all help with my questions.

*racedvl* · 03-30-2003, 06:12 PM

You do not have to have power brakes. There is manual disks, but beware, disks take more pressure to operate, and your leg will be doing more work. If you do stay manual, get a 71/72 proportioning valve. Also, if it were me, I would swap out the whole cross member. But it is a whole lot easier to do without the engine in the truck.

67cst · 03-30-2003, 08:17 PM

i just did that disc swap, took the whole cross memeber out, it went slick

lngbed71 · 03-30-2003, 09:38 PM

There is a picture of my 71 proportioning valve in the "post a pic of your truck" thread page 2, titled under the hood. I've heard that changing the upper/lower control arms works well for a swap. Hope this helps.

ratrod67 · 04-01-2003, 03:57 PM

Thanks for the comments. Anyone else?

Pumkin Truck · 04-01-2003, 09:14 PM

Ratrod 67:
I just recently completed my disc brake swap today. My 69 gmc had manual drums but i bought the front end off a 72 gmc who had discs. I didn't simply swap crossmembers, I just swapped the spindles basically. If my memory serves me correctly, all i did was replace my drum spindle with the 72's, purchased new upper and lower ball joints/calipers/discs. Be aware that when I completed the swap, I had to use the 72 ah what are they called, not pitman arms but the other ones, i forget, mind isn't thinking right now but as soon as i reload my camera program in my comp i can show you everything.

*racedvl* · 04-01-2003, 10:12 PM

Quote:

Originally posted by Pumkin Truck
Ratrod 67:
Be aware that when I completed the swap, I had to use the 72 ah what are they called, not pitman arms but the other ones, i forget, mind isn't thinking right now but as soon as i reload my camera program in my comp i can show you everything.

Tie rod ends. . . ?

Pumkin Truck · 04-05-2003, 05:12 PM

Yea dem be it!

03-30-2003, 06:07 PM	#1
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,269	Disc swap questions I have a 69 Chevy with 6 lug and drum brakes. I just bought a 72 Chevy rolling chassis with 5 lug and disc brakes. I have a few questions about swapping the parts over. 1-What is the easiest method to do this swap. I've heard about swapping crossmembers and was wondering how to do this. 2- The 72 is missing the brake booster and master cylinder. Can I set it up as manual disc or is the power booster required. Can anyone tell me the proper length push rod? 3-Can someone show a picture of the proportioning valve? There are 3 different valves in the back of the truck and I'm wondering if I have the right one. Thanks for any and all help with my questions.

03-30-2003, 08:17 PM	#3
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	i just did that disc swap, took the whole cross memeber out, it went slick __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

03-30-2003, 09:38 PM	#4
lngbed71 Nothing fits but the oil Join Date: Mar 2003 Location: Gaston, Indiana Posts: 424	There is a picture of my 71 proportioning valve in the "post a pic of your truck" thread page 2, titled under the hood. I've heard that changing the upper/lower control arms works well for a swap. Hope this helps. __________________ Land of the free Because of the brave

04-01-2003, 09:14 PM	#6
Pumkin Truck Thats just prime! Join Date: Mar 2002 Location: TEXAS Posts: 720	Ratrod 67: I just recently completed my disc brake swap today. My 69 gmc had manual drums but i bought the front end off a 72 gmc who had discs. I didn't simply swap crossmembers, I just swapped the spindles basically. If my memory serves me correctly, all i did was replace my drum spindle with the 72's, purchased new upper and lower ball joints/calipers/discs. Be aware that when I completed the swap, I had to use the 72 ah what are they called, not pitman arms but the other ones, i forget, mind isn't thinking right now but as soon as i reload my camera program in my comp i can show you everything. __________________ 69 GMC short bed stepside with a wimpy six that can barely pull itself. 99 Chevrolet Camaro Z-28 1 Bad 5.7ltr LS1

04-05-2003, 05:12 PM	#8
Pumkin Truck Thats just prime! Join Date: Mar 2002 Location: TEXAS Posts: 720	Yea dem be it! __________________ 69 GMC short bed stepside with a wimpy six that can barely pull itself. 99 Chevrolet Camaro Z-28 1 Bad 5.7ltr LS1

03-30-2003, 06:12 PM	#2
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	You do not have to have power brakes. There is manual disks, but beware, disks take more pressure to operate, and your leg will be doing more work. If you do stay manual, get a 71/72 proportioning valve. Also, if it were me, I would swap out the whole cross member. But it is a whole lot easier to do without the engine in the truck.

04-01-2003, 03:57 PM	#5
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,269	Thanks for the comments. Anyone else?



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