Jump to content

1968 GMC Disc Brake Conversion Help?

XRMAN

Recommended Posts

XRMAN Enthusiast

XRMAN

Posted
Posted

I looking for some input,Advise on conversion fro drum to disc on front of Truck,to retain 6-lug wheels. The truck has some old school wheels that I think looks very cool on the truck. It is mostly stock 350/350 in it,also needs power brakes installed. I am also a Tech. by trade. I found a 1971 C10 in a salvage yard with stock disc brakes,but it has 5-lug wheel,will 6-lug disc fit off mid to late 70's C20?

Thank for any help.

oldscsc Enthusiast

oldscsc

Posted
Posted

As far as I know, the 67-72 body style 1/2 ton 2wd has runs 5 lug wheels as you found out. The same truck in 4wd (k10) are 6 lug. And 3/4 tons (from at least 1960-current) will have 8 lug wheels, 2 or 4wd (with a few light duty 2500 6 lug exceptions along the way).

 

Since most all disc brake conversion kits change to 5 lug (for wheel choices), you could look into some 5-6 lug adapters. Run your wheels with the convenience of a conversion kit and they don't break the bank.

oldschool327 Senior Enthusiast

oldschool327

Posted
Posted

Classic industries has the 6 lug rotors you are looking for. I did the same kit to my 68 step side. Cost about 500the for the entire co version

XRMAN Enthusiast

XRMAN

Posted
  • Author
Posted

Thanks oldschool327. I haven't look there yet. Still wonder if the 5-lug spindles would work to put 6-lug rotors on. I can get all the parts for $75.00. Don't know if the ball joints are the same.

XRMAN Enthusiast

XRMAN

Posted
  • Author
Posted

Thanks oldschool327. I haven't look there yet. Still wonder if the 5-lug spindles would work to put 6-lug rotors on. I can get all the parts for $75.00. Don't know if the ball joints are the same.

 

At salvage yard that is!

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,791
    Total Members
    8,960
    Most Online
    d.lowrey
    Newest Member
    d.lowrey
    Joined

  • Who's Online   3 Members, 0 Anonymous, 4,376 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      J&L OIL SEPARATOR CO

      By Grumpy Bear · Posted

      Just did an injector/HPFP replacement on Pepper at 192,400 miles; close enough to 200K, RIGHT? (If 200K is considered life end and to me it isn't). But hey, to each his own.    Have never run a catch can on this vehicle. Back side of every valve looked like a new valve spray painted semigloss black. Port walls looked 'neat' (all a normal result of passive EGR via VVT) Zero build up even in AFM cylinders. Just color. It uses no measurable oil and never has.    At 155,000 I put her on E-85 and a borescope of the cylinders at plug change showed very clean pistons and valve faces. The replaced injector tips looked new. (It was the pump piston seal that was leaking). Oh well, have six good backups.    Still gets 28 mpg on gas (highway average) and over 20 (highway) on alky. UOA's look good and runs as good now as it did when I bought it. Better in fact.    What improvement would a Catch Can provide this motor?     And given all this I expect that IF I installed one I'd see some water/gas/oil vapor accumulation. Byproducts of normal combustion.   Having said that, IF my motor used an appreciable amount of oil I'd consider it a useful 'crutch' until I had the situation corrected OR if bore polished, until I junked it or rebuilt it to stave off repeated plug fouling.    I'm not telling you what I THINK. But what its DONE.          
    • Grumpy Bear
      Starting a new thread regarding mounting my 2014 OEM wheels to my 2026

      By Grumpy Bear · Posted

      Love the look. I'm a SCSB lover myself.    Two items. 1.) A spacer changes scrub radius but this also changes when we use wheels of different offsets. A little isn't a big deal. 2.) Steel wheels, alloy wheels all have different thickness. Same effect on the stud and lug nut as a spacer. When hub centric the wheel isn't supported by the stud. It's supported by the hub. The stud just keeps it all together.  
    • JAI3
      2016 Sierra 5.3L L83 new injectors now runs rich.

      By JAI3 · Posted

      I had a evap sol go bad a couple weeks ago. . I replaced it.  While watching live data at the time I saw I had some cylinder 1 misfires. No MIL but on live data I could see ~50 at startup and about 70 more after an hour a drive all on cyl 1.  I also noticed that the LTFT were -5% to -15% always.  And that bank 2 is always -3% richer than bank 1. Even across all driving modes, city, highway, etc it’s always 3% richer than bank 1. So I start with the misfire. Swapped coil, plug, and plug wires from 1 to 3. No follow. I got an Injector reseal kit, pulled the D/s injector rail, swapped #1 and #3 injectors, resealed them, reinstalled and retested.  The misfire followed to 3. So I ordered and replaced all 8 injectors, spark plugs, and plug wires. Also replaced the 1 time use fuel pipes under the intake manifold.  Injectors that were in the truck since new were  Part # 12668390.  I replaced them with # 12742701 Got from RockAuto. Pretty certain they’re genuine and the correct ones. I called a friend at a parts store who told me “the 12742701 were the correct superseded part # for the originals I was replacing”. So started truck after replacing all that and it’s running -15 - -30 LTFTs. I reset the fuel trims with GDS2 and drove it for a 60 miles trip each way. There have been no changes in the LTFTs.  I checked if the HPFP was leaking into the crankcase. I removed the pvc and watched the trims. No difference.  I checked the alcohol content and it was at 10%  I’m out of ideas here. Truck seems to run great. Just always rich on the fuel trims.  Anyone with any help or ideas would be greatly appreciated.  I ran an injector balance test just for the heck of it and it came back this. I’m confused.  I have gds2 and some other diag tools if anyone knows of anything I should test next.
    • Coastie05
      Will not stay in Reverse

      By Coastie05 · Posted

      Definitely needs to go back to the dealer. 
    • Grumpy Bear
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Grumpy Bear · Posted

      No, but don't skimp on safe! 😉 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...