Disc mix and match facts?

[tmills213]

I have a 76 c20 complete front suspension. I have searched for a while and some say it is possible to use the upper balljoint from the 76 on my 64 while the lowers wont work because of the saddle. There is some mention of the 76 balljoint possibly fitting the 64 LCA if the hole is opened slightly. There are never any numbers/dimensions or confirmations. I am hoping to get some real facts. Please let me know if I missed this somewhere else. The upper is shown. working on removing the lower tomorrow.

upper


upper hole


misc

[SCOTI]

Upper BJ mounting bolt dimensions are the same (I have C30 upper BJ's in a set of arms that were removed from my 68 C10).

Lower BJ's are different between C10's & C20/30's. As you noted, they are a larger OD where they press into the arm.

That being said, I've never heard of anyone "opening the hole slightly" to allow swapping them in. It would seem that doing something like that would definitely weaken the formed lip it seats in. I can't say factually that it will/won't be safe; but it doesn't seem like a good idea.

[tmills213]

What am I missing here. They (lbj) measure the same. Edit: just read that you said c10 to 20. I'm looking 64 c20 to 76 c20

[SCOTI]

64 C20 & 76 C20 parts will interchange.

I'm not certain on C20 drum to disc swaps, but on C10's the BJ's are different. I would research the p/n for upper/lower 64 C20 & 76 C20 BJ's to see if they're the same or different for the answer.

[tmills213]

Well, update. I got the ball joints pressed in correctly the second time around. Waiting to either powdercoat or por 15 the spindles. Also waiting for my tie rod adapter to be finished up. Just finished drilling the upper holes for the bag mount and broke a bit off -awesome-. And lastly the steering and bump stop got cut out and I need to decide how i want to do it.





1976 c20 tie rod. 11/16-18 RH thread


1964 c20 tie rod 5/8-18 RH


was going to make the plates but just bought them for realistic time reasons


much bigger than I thought


Not completely seated either


popped the rivets. not easy for some reason. two smashed fingers later


so far so good. guess i need to start looking into prop. valves and what have you.

[tmills213]

So I have been in a huge stagnant period due to my own laziness and waiting for parts. I got a 5/8-18 LH tap and ended up turning an adapter shaft. Got it home and the runout on the lathe must have been worse than I thought because the threads were way loose on the 5/8 side. the 11/16 side was perfect. I said screw it and was going to buy the adapter sleeves here

https://www.performanceonline.com/19...ONVERSIONS-Pr/

I asked them and they said they are only 5-5/8" long for the 64. This is about half of what I need. Its even shorter than the original one. I came up with roughly 11.5" which has plenty of thread engagement.

What am I missing here...

[tmills213]

I just read to use the 65-70 outers as my inners on the 64. Is the length about 7.4 inches on these.

second I read that the 72 el camino brake line will adapt my caliper to my existing 64. input?

anyone help with anything.
thanks

[tmills213]

Well I just made and powdered the adapters using the original 64 outers. the adapter is 11.5" solid 1" OD 4140 chromolly. I also got the bags mounted and I came to the bump stop and steering stop. I figure something out that was simple for the bump stop but do you guys think its necessary to have a turn stop too? and does anyone know how much the bags expand under pressure. Hope it doesn't hit that bump.

Tube


installed


bump stop




on to the brakes and air....

[Slow Build]

It looks like that bump stop would really limit your travel.

[tmills213]

It starts to touch just under 3" and the min travel is 2.8" according to D2600 specs. I think shown it is jacked all the way up.

[tmills213]

Not sure if this should be a new thread or not but I bolted everything back together. And that part seemed ok.

Got the truck to hold its own weight and air to the bags. They look wayyy too big. IDK what is going on. aired out the bag hits the inside towards the engine of the LCA. My bumpstop rubs too after ballooning but I can fix that. At full air the top bump stop is maxed out as shown in the pictures. I had to walk away for the day before I started doing more stupid things.

Is it because these are not drop spindles or something. I am not trying to get super low. Just a little bit and improved ride quality while maintaining 3/4 ton aspect of the truck.





maxed out upper stop



https://www.youtube.com/watch?v=rImb...ature=youtu.be

https://www.youtube.com/watch?v=5CNv...ature=youtu.be

[tmills213]

Well I am stuck and figure I should update if anyone is paying attention. I have ditched the bags for this year for the sake of getting it rolling before winter and my first child coming.

Both sides have all fresh hardware and bolted up.


I am down to getting the braking system hooked up and cant figure out what exactly I need. Even though I read the 70s c20 rubber hoses are too long I (being naive) tried since they were in stock. They are too long and will rub/hit in a few spots. It is almost as though the curved piece off the caliper should be straight out.

I read some places that a el camino hose may be able to be used? Cant find too much on this yet.

Once I get past this I will need to figure out the correct M.C. I have a 1979 14 bolt drum (that will eventually go to a disc) and a 76 front disc. should I use a 76 dual master?


Please let me know where to look. I will happily read more but I feel like I am going in circles.

[tmills213]

Well for those looking. It is "finished" for now. I ended up using 1985 impala hoses. they are just long enough. I tied it into the existing hardware with an adapter for now just to make it roll and stop. It stops ( what seems) pretty smooth. My tie rod adapter rod was 11.5" and needs to be 10.5-11ish. it is just a hair too long. No leaks but I did find this little gem while I was under there. :/ no luck.




sits pretty low. lots of junk in the bed


andd the best part of all.....

[tmills213]

deleted Double post