Drums to Discs Question?

[chevykevy]

I would like to put disc brakes from a 71 on my 68. Can I use the 68 Control arms? How about putting a booster on. Can I use the existing brake bias valve? What else do I need to consider?

[sneakysnake]

keeping it 6 lug
http://67-72chevytrucks.com/vboard/s...ad.php?t=35042
swapping to five lug
http://67-72chevytrucks.com/vboard/s...d.php?t=160435
Hope this will answer your Q's

[RicksTrucks]

But if you take the whole front crossmember from a 71-72, do you have to worry about control arms, etc.?

[Ol'blue72]

Yesterday I pulled the power booster, proportioning valve and all from my 71 an put it on my 72 that already has discs, am i going to run into any problems?

[krue]

Originally Posted by Ol'blue72

Yesterday I pulled the power booster, proportioning valve and all from my 71 an put it on my 72 that already has discs, am i going to run into any problems?

Shouldn't have any problems, should be identical to the 72 stuff.

[krue]

Originally Posted by RicksTrucks

But if you take the whole front crossmember from a 71-72, do you have to worry about control arms, etc.?

You shouldn't have to worry about any of it.

[c10crazy]

Can you keep 6 lugs while using any 71-72 stuff?

[dennislbrooks]

you can stay 6 lugs -- there are choices and also you will have to deal with the outer tie rod ends if you retain the 68 steering link--both can be overcome

[c10crazy]

Hate to sound dumb but I want to stay with 6 lugs. What specific parts do I need from the 71' and what else do I need to buy??

[dennislbrooks]

well you can buy the McNaughy's rotor kit or ------- we are pretty sure that a GMC 88-91 3/4 ton Light Duty 6 lug is the match made in heaven. I know for a fact that a 71/72 rotor fits on the 88 3/4 ton van LD spindle (bearings are the same A5 inside and A3 outside. Just a matter of which caliper to use -- and maybe that does not make a difference either. One good thing is you can take them back to Oreilly's for refund. I have 6 lugs and disc all the way around on my 67.

[c10crazy]

Ok, so I buy the 1988 6 lug rotors and calipers. What other parts do I need from the 71'? chevykevy I hope I'm not hijacking and hope this helps you too.

[dennislbrooks]

I would try the 71/72 caliper and pads first ---- bearings and seals , 71/72 flex hoses --you need to modify the 71/72 outer tie rod ends if you are using the 65-70 steering link ---see link below

http://67-72chevytrucks.com/vboard/s...d.php?t=188551

And I assume you know you need to use balljoints for the 71/72.

[c10crazy]

Sounds like I use everything from the 71' except the rotors.

[dennislbrooks]

let us know how it works out --- I believe the rotor thickness on the 71/72 is 1.25" and the 88 is 1.28" --- if pad clearance is too close the rotor can be slightly shaved -- probably not needed tho

[1969owner]

im doing this shortly.......im gonna get the entire 73 front end, with power steering etc, and put 6 lug rotors on it, and let her loose. with a lil riggin, anythings possible.

[c10crazy]

Thanks man. I'm going to try searching the board for some kind of list I can print out to see exactly what I need and what I can keep. I'm suspension illiterate

[1969owner]

http://67-72chevytrucks.com/vboard/s...d.php?t=188429

[boraxman]

Careful using '71 parts, I found out while doing my conversion that some if not all? 71 rotors are 1"...so using 71 calipers on 72 up rotors wont work.

Someone correct me if im wrong here

[dennislbrooks]

agree, anything is possible -- I have found that usually the 1 " rotors are LD and take the A6 inner bearing instead of the larger A5 --had not seen this on a 71 oem --but who knows what someone changed on these trucks before we got them.