you want to change your 5X5 bolt pattern on 73-87 disc to 5X4.75

[Grip]

If you want to convert to the car bolt pattern with factory parts, check with a wrecking yard that uses the Hollander Interchange books. I found that a 71-72 (if I remember the year correctly) G-10 van had the same upper and lower control arms as a C-10 truck, but used the car 4.75" bs rotors. Just score the spindles and for a bolt on conversion. I used this setup years ago to convert a 73 C-10 that I pro-streeted. I had 15X3.5" weld drag lites and they didn't make them in 5X5 bs.

[67 cst swb]

Originally Posted by Grip

If you want to convert to the car bolt pattern with factory parts, check with a wrecking yard that uses the Hollander Interchange books. I found that a 71-72 (if I remember the year correctly) G-10 van had the same upper and lower control arms as a C-10 truck, but used the car 4.75" bs rotors.

Well, you are correct on this... In addition to 71-72 there is also 73-74 G-10 vans. These (71-74 G-10) use the 70-78 camaro rotor & caliper. So, there are numerous outlets for big brake kits. Bear, SSBC, etc...
There is a difference between 71-72 & 73-74 G-10 Spindles, the outer tie rod mount is different. It's thicker where the taper of the outer tie rod goes thru the spindle.
As far as the outer tie rod ends used:
71-72 G-10 is same as 71-72 C-10
73-74 G-10 is same as 73-74 C-10
If I remember correctly, the 73-74 tie rod hole is thicker top to bottom.
In 75 G-10 went to 5 on 5 bolt pattern.

I have a set of each 1) 71-72 G-10 van spindles complete & 1) 73-74 G-10 van spindles complete.
My plan was to build a race truck style build and use cross drilled rotors that are commonly available for 70-78 camaro rotors as well as aftermarket race caliper (wilwood, strange, etc...) I actually had them mounted on a rolling frame for awhile with 15x7 ralley's for about a year before I changed my vision for the project.


P.S. yeah, I've worked in auto parts for 22 yrs, 5 yrs of that at NAPA, so, had lots of time to research stuff like this...
If you wanna talk using stock parts to come up with 6 on 5-1/5" disc brakes PM me, I've researched that as well, If I remember SCOTI helped me on that deal... that was awhile back, If SCOTI doesn't remember helping out, I'll take FULL credit for the research.... Just kidding SCOTI.
Bryan

[heavychevy79]

Originally Posted by 67 cst swb

P.S. yeah, I've worked in auto parts for 22 yrs, 5 yrs of that at NAPA, so, had lots of time to research stuff like this...
If you wanna talk using stock parts to come up with 6 on 5-1/5" disc brakes PM me, I've researched that as well, If I remember SCOTI helped me on that deal... that was awhile back, If SCOTI doesn't remember helping out, I'll take FULL credit for the research.... Just kidding SCOTI.
Bryan

Man let me in on that, I would love to do a six lug conversion!