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Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1157771
Thu Mar 31 2016 11:20 AM
Thu Mar 31 2016 11:20 AM
D
danzimbric  Offline
Wrench Fetcher
Joined: Sep 2015
Posts: 54
Shallotte, NC
Having invested several days digging through piles of truck tires and rims at the salvage yards looking for 20 inch 8 bolt stud piloted Budd wheels for my '56 C6500 I can tell you that the 5/10 bolt 19.5 rims are still available.
dan

Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1157820
Thu Mar 31 2016 07:04 PM
Thu Mar 31 2016 07:04 PM
M
Mike B  Offline
Shop Shark
Joined: Mar 2004
Posts: 3,707
Hughesville, MD
Dan,

What did the 8 stud Budd 20's originally come on?

Mike B smile

Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1181133
Sun Sep 04 2016 04:29 PM
Sun Sep 04 2016 04:29 PM
T
Tango  Offline
Shop Shark
Joined: Mar 2011
Posts: 735
Texas
Yep...lots of 19.5 rims out there. Mine are from a 1998 Chevy 3500 4x2 Dana 80 HD Duallie w/wide track. But they also came on some '94 to '02 Dodge 3/4 & one-ton trucks as well as '88 and later Ford F-350 & 450 Super Duty rigs.

While I much prefer the look and height of the original 20" wheels, I needed the gearing of a newer axle plus tubeless tires so I went with the Dana rear axle. It has a lug pattern that matches the original ('46 1.5 ton in my case). I did have to make 1/4" spacers for the fronts since the center pilot hole on the newer rims are that much larger but it was no big deal.


1946 1.5-Ton Chevy Shorty Bus
In the Stovebolt Gallery
More pix on Flickr

All my best --- Tango
Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1182903
Fri Sep 16 2016 04:18 PM
Fri Sep 16 2016 04:18 PM
4
40_chevy  Offline
Wrench Fetcher
Joined: Mar 2004
Posts: 53
Victoria, BC, Canada
I'm hoping to do something about the brakes on my '52 GMC 9700 (Canadian built 3 ton) I see the GMC 400 series 3 ton with Clark F466 front axle was mentioned for width at the front of the topic, but didn't see much about it after (also not sure if this would be the same axle as mine or if the Canadian trucks ran something different) Are there big differences from the 2 ton to 3 ton axles?


1940 Chev, model 14-24
1952 GMC, model 9783
1953 Chev, model 1143
Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1182961
Sat Sep 17 2016 04:32 AM
Sat Sep 17 2016 04:32 AM
G
Grigg  Offline OP
.
Joined: May 2005
Posts: 8,957
Lexington, VA
The springs are mounted parallel on a 400 series GMC and they taper in narrower on the 2 ton and smaller AD trucks.
To know if this spindle swap might work on your axle find or measure kingpin diameter and thickness of axle end where the kingpin passes through.


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1190791
Sun Nov 13 2016 10:21 PM
Sun Nov 13 2016 10:21 PM
M
MelodyM  Offline
New Guy
Joined: Nov 2016
Posts: 6
Washington State
Okay... but if its the rear hold down springs that need to be replaced... Napa... OReileys... no one carries nor can they get them... how do i get the springs then??

Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1253613
Sat Feb 03 2018 08:37 AM
Sat Feb 03 2018 08:37 AM
4
40_chevy  Offline
Wrench Fetcher
Joined: Mar 2004
Posts: 53
Victoria, BC, Canada
I've been reading this post over and over. I think I get it for the most part, though it probably would be easier with picture links that worked (Grigg - I did find the ones in your signature, All pictures / Disk brake upgrade...) This would all be likely easier if I could find one of these golden P-30 axles to at least see, I finally saw what a 3500HD front axle looks like on a '94 today (Not so many of those here either). Still no luck with acquiring either, but I imagine in time I will find one.

Things I'm not quite sure of (More for Grigg, as most of the questions are on pics from his album):
I see the (I'm assuming) 2 X P-30 axles, but both with different DRW style rotor / hubs, but by the end of the album it looks like you've gone with an SRW style rotor? Also, it looks like 8 on 6.5 pattern? I see mentioned earlier there is lots of talk of the 5 /10 bolt pattern used. Are the P-30 spindles different between the 8 on 6.5" and the 5 /10 bolt patterns, or once you find an 8 on 6.5", you're committed to that pattern due to caliper mount? (rotors are different od?) If yes to using the SRW rotor, are you using a DRW rim on it?

I did confirm both my kingpin size, and the axle thickness are the same (Ie P-30 is possible fit) on my Canadian 3 ton (but I still don't really know what my axle is), and yes, the springs are parallel on mine. Nobody remembers changing anything axle wise (front or rear) on my truck, and that's going back to the early 70's. (It has an odd bolt pattern, not the usual pattern other Canadian 9700 3 tons have, Mine is 5 lug on 8", with a 6" hub bore, 20" rims both front and rear axles) Long story short, it would be nice to see what the stock 2 ton drag link / tie rod setup is, to confirm if mine is the same, different or more importantly whether or not it could work. My steering arm appears to thread into the spindle and is held on by jam nut below the axle. It goes aft and connects to the tie rod (behind the axle), and comes up above the axle, link connects to it, parallels the leaf springs and heads aft to the steering box...

Thanks,

Matt

Last edited by 40_chevy; Sat Feb 03 2018 06:29 PM. Reason: correction, had a brainfart

1940 Chev, model 14-24
1952 GMC, model 9783
1953 Chev, model 1143
Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1253617
Sat Feb 03 2018 12:33 PM
Sat Feb 03 2018 12:33 PM
G
Grigg  Offline OP
.
Joined: May 2005
Posts: 8,957
Lexington, VA
The 8 lug and the 5/10 lug axles are essentially same except for rotors/hub (diameter) and matching caliper bracket.

Your unusual hub centered wheels are “Motor Wheels” Not that uncommon on a GMC like yours, and some other makes of trucks too.

You say parallel front springs, which makes your truck about like an American GMC 400 series, even bigger than the 1-1/2 and 2 ton fenders right?
The steering arm attachment you describe sounds like what Spicer does, perhaps a Spicer axle/ though it doesn’t really matter who made it, it is what you have.
If your axle has same thickness at the end where the kingpin fits very likely you can swap these spindles with appropriate bushings.
However... a 3 ton truck might be a little big for P-30 front axle components, weight wise. Also, the 5/10 lug pattern on 7.25 wheel options are 19.5” (look real small) 20” (tube type) or 22.5” (hard to find, and only 38” with 9R22.5).

Check your kingpin diameter, it may be larger and allow larger spindle swap, bigger than P-30 and different better bolt pattern choices. Look in my photo album for 53 GMC which gets larger Spicer spindles and brakes with 6 lug Budd wheels.

My pictures do show 8 lug and 5/10 lug and single and dual wheels. Different stuff going on, the 8 lug and single wheel (with smaller diameter rotor) is for 3/4 and 1 ton, except troubles with overall axle width.
The 5/10 lug is best for 1.5 and 2 ton.


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1253648
Sat Feb 03 2018 06:21 PM
Sat Feb 03 2018 06:21 PM
4
40_chevy  Offline
Wrench Fetcher
Joined: Mar 2004
Posts: 53
Victoria, BC, Canada
Sounds right from from I've seen, Re the 400 series. Attached a few photos of what my fenders, and linkage looks like. (probably much better than my description) There is a small portion of the kingpin sticking out the top of my spindle, It measures 1.105" so a little bit smaller but I suspect it's the same 1.109" kingpin. For size ref in the pics those front tires are 7.50/20 (and not that it matters but my rears are 8.25/20) I edited the last post, had a brain fart when I noted the bolt pattern, so I gave you the wrong info there. Should have read (large pattern) 5 lug.

Matt

Attached Files
gmcfender1.jpg (277 downloads)
gmcfender2.jpg (279 downloads)
gmcaftlookingfwd.jpg (279 downloads)
gmcfwdlookingaft.jpg (280 downloads)
Last edited by 40_chevy; Sat Feb 03 2018 06:37 PM. Reason: additional info

1940 Chev, model 14-24
1952 GMC, model 9783
1953 Chev, model 1143
Re: Disc brakes for 3/4, 1, 1.5, and 2 ton trucks [Re: Grigg] #1263934
Sat Apr 28 2018 02:35 AM
Sat Apr 28 2018 02:35 AM
M
Mike1950AD2ton  Offline
Moderated
Joined: Apr 2018
Posts: 1
Alberta
Hi. I have started a restoration project on a 1950 Chevy 2 ton truck. I have a P30 van to swap the rear axle over and hopefully swap on the front spindles as per this thread. I was just wondering if anyone has finished doing the swap and how it drove after, caster alignment ect with the p30 spindles. Thanks.

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Moderated by  69Cuda, Grigg 

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