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What did you
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????


The question, initially posted May 23, 2005, was:
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this weekend?"

After 51,906,997 views, 7378 replies over 185 pages, this thread in General Truck Talk is a happening! And it's not just weekends anymore.


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What did you get done on your Bolt today????


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Later Air Brake Knuckle Swap?
#1451551 Fri May 13 2022 02:14 PM
Joined: Mar 2022
Posts: 25
M
'Bolter
I'm curious if it would be an option to adapt later air brakes form a c60 or something similar to a 2 ton AD axle, similar to the p30 swap, but with bigger and better(air) brakes. Could one of the members with a later truck get measurements to see how feasible it would be? I think if you could swap the whole wheel end onto the older axle, you could upgrade to a newer bolt pattern (get rid of those widowmakers) and get better brakes. Kingpin to WMS, kingpin diameter, and axle thickness from a newer air brake truck would be great. i do understand there were several different front axles available, so getting measurements from as many of those as possible would be good as well. Thanks.

Re: Later Air Brake Knuckle Swap?
MrVaughan #1451558 Fri May 13 2022 04:34 PM
Joined: Jun 2011
Posts: 4,452
E
'Bolter
Disc brake to GM 2 ton axle with 10 on 7.25” axle is pretty common, would that work for you?

Or 10 on 8.75” bolt pattern redrilled to 10 on 7.25” with 22.5” wheels?

Ed

Attached Files

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Later Air Brake Knuckle Swap?
EdPruss #1451559 Fri May 13 2022 04:56 PM
Joined: Mar 2022
Posts: 25
M
'Bolter
my purpose would be to test the feasability of using brakes from a newer medium duty chevy, as you'd get the updated 10x8.75 lug pattern. i don't know about the rear end, but i think it would be possible to get custom bushings or kingpins to adapt them, if they are reasonably close enough.

Re: Later Air Brake Knuckle Swap?
MrVaughan #1451604 Sat May 14 2022 02:00 AM
Joined: Jun 2011
Posts: 4,452
E
'Bolter
I suspect that would work out if you took the whole axle, brakes, steering rods, etc. Same in the rear; start out by determine best wheel bolt pattern.

ED


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Later Air Brake Knuckle Swap?
MrVaughan #1451637 Sat May 14 2022 03:41 PM
Joined: Feb 2020
Posts: 21
A
'Bolter
Yes it's possible, a guy on 67-72chevytrucks forum did it with his c50 10x8.75" bolt pattern. GM made trucks with that bolt pattern and optional disc brakes front and rear from ~1982-1992.

So as long as the kingpin diameter of your axle is smaller than the kingpin diameter of the air brake knuckles, you can ream out the axle and make it work. Then it's figuring out steering linkages and brake hoses.

Last edited by AlexB; Sat May 14 2022 03:42 PM.
Re: Later Air Brake Knuckle Swap?
MrVaughan #1451657 Sat May 14 2022 07:36 PM
Joined: Jun 2011
Posts: 4,452
E
'Bolter
Reaming out axle ends to fit larger king pins, weakens the axle ends. As long as both trucks are about the same gross weight, if the air brake king pins are larger, one can bush up the smaller king pins with steel sleeves, or custom fabricated bushings, which are relatively inexpensive. That is assuming all the other parts play well together.

Ed

Attached Files

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

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