Build a hypothetical 3500HD.

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GMC Burbalade

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These 05 450/550 axles.
Are these the same distance for the radius arm to mount as the 250/350 axles, frame side?
As far as I'm aware front suspension geometry is the same 250-550, with axle tubes and shafts being longer on the 450/550 wide track axles. (more distance between coil/link mounts and inner Cs)
 

Spareparts

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Beat up and to much money but a good start. Been listed for a few months.
 

skylark

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Beat up and to much money but a good start. Been listed for a few months.
I'm actually planning on picking up one in California on New Years weekend. It has a running 6.5 but the tranny is failing. We agreed on $1000.
 

454cid

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You going to run the 6.5L? Apologies if you've already covered this.... the thread is 10 pages long now.

I think I'd run it, but it would be a local usage toy for me, until it pooped out. Then I'd swap in a 454, 8.1, or maybe an early Duramax.
 

Supercharged111

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You going to run the 6.5L? Apologies if you've already covered this.... the thread is 10 pages long now.

I think I'd run it, but it would be a local usage toy for me, until it pooped out. Then I'd swap in a 454, 8.1, or maybe an early Duramax.

Early is the worst one.
 

skylark

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You going to run the 6.5L? Apologies if you've already covered this.... the thread is 10 pages long now.

I think I'd run it, but it would be a local usage toy for me, until it pooped out. Then I'd swap in a 454, 8.1, or maybe an early Duramax.
I have a 6.5 Opitmizer with all of the reliability goodies and some upgrades. That will be the initial stage. The first stage will be to extend the frame for the crew cab and swap everything from Pearl, our 2000 K3500 dually into the 3500hd chassis. It will stay 2wd at that time.

The next stage will be most likely F550 axles and converting to 4wd on leaf springs. If it looks like it will be too tall then the air bag suspension will happen at this stage.

It will run like that for awhile while we collect parts to do a 5.9 Cummins/Allison swap. That should be the final stage.

Here is Pearl.
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