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Jan 21st, 2020
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Joined: Jun 2011
Posts: 4,977
'Bolter
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If they are larger, just make some adapters.
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.
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Joined: Dec 2008
Posts: 408
'Bolter
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I have this very combination on my bus. Dana 80 rear axle with disc brakes and 4.64 gears out of an early 2000 wrecker and I put 1985 P30 spindles on the front with the same 5 lug bolt pattern with disc brakes. And then added adapters and run Alcoa 22.5" wheels.
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Joined: Jun 2011
Posts: 4,977
'Bolter
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What bolt pattern on those 22.5’s?
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.
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Joined: Dec 2008
Posts: 408
'Bolter
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They are the modern semi truck bolt pattern. I believe they are 10x285mm.
Last edited by fclaridge; Wed May 10 2023 06:02 AM.
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Joined: Nov 2022
Posts: 63
OP
'Bolter
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Just a little update.
I have the Dana 80 rear from the 1994 Chevy 3500HD truck installed. I have the spindles/front disc brakes from the 3500 HD installed. I had to source rear steer arms (which I think is the most difficult part of this swap). Ironically, the original COE tie rod and tie rod ends fit the late model steering arms. I did have to machine the original front axle slightly as the king pin ends were slightly too tall and I mean slightly, with no shim. I am "planning" to use a reverse rotation steering box from a 1978 Dodge W100-200 which mounts to the SIDE of the frame in a cradle. The pitman arm is also sourced from the same vehicle to fit that box. I have not mounted the steering box yet because I want the full weight of the body and bed on the truck first so I can keep the drag link relatively level. I will have to fabricate the drag link. I am going to run 1" steel adapters to adapt to 22.5" Alcoa wheels. Duals would be too wide in back, but I found a super single wheel with a nice offset and like new Michelin tires, so that what I will be running on the back. I had also found a set of 22.5" RV wheels which are narrower than Semi wheels. I felt this was important on the front. I would have rather run the Alcoa RV duals in the back but it looks like they will be too wide. I am waiting on an adapter to test fit before the other 3 are machined.
SO that's where I currently stand. The 9R22.5 tires are slightly taller than the originals and the tires on the super singles are also slightly taller at 40" from stock, but I think the truck will look better than trying to run 19.5" wheels which are 6" shorter than originals. We'll see what shakes out in all of this.
Marty
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