1970 GMC 2500 2WD 8 Lug disc brake conversion

[MADMIKE]

I checked the rules, and used the search, but I cannot find anything clear cut regarding the 8 lug(wrong terms? VBullentin 3 letter hiccup?). Trying to find out specifics for what needs to be done. Any and all help will be greatly appreciated. Not sure if I have violated board etiquette with a newbie posting. I will gladly take any internet beat downs if it brings the tech.

I'm assisting my neighbor, yesterday we snagged rotors/calipers/spindles/FUCA+shims/FLCA/springs off a 80s Suburban. But it was apparent we need parts of the steering gear, as his '70 LB outer tierods are small compared to the ones on the Suburban.

Originally Posted by lolife99

DRUM TO DISC CONVERSIONS 67-70

3) The 67-70 a-arms can also be used with any other (71-72 or 73-87) spindle, with a simple ball joint change.
* The upper and lower ball joints and outer tie rods must match the correct year of spindle you choose.

The sleeves and tierod shank diameter on the Suburban are much bigger. We are going to head back this morning to snag the rest of the steering gear.

Outside of 'conversion kits' is there anything else we can do to expedite this conversion? Can he retain his original PS pump/box? From looking at online resources it appears that none of the steering parts interchange. Even the kingpin kits from ACDELCO have different part numbers.

Also what is the preferred or best method for the combination valve?
His '70 has the combo valve mounted next to the master cylinder, the 80s trucks have them mounted to the front frame brace. IIRC the ports are in different spots. Any chance we can just use the guts of an 80s 8 lug P/U combo valve in the '70s? (Probably not).

Hose, I was thinking of just using the Suburban hoses, and if need be, adapters to fit the hard line.

MC, I believe his 70 is 1-1/8". Can this be retained, or do the 80s trucks use a quick take up design?

He would like to keep it relatively simple for parts replacement. If using all of the Suburbans parts are the way to go about it then so be it.

Thanks in advance for any and all help.