8 lug semi float 14 bolt disc brake swap with gmt800 rear brake setup

[Jerome3521]

Has anyone swapped in the rear disc brake setup from a gmt800 with an 8 lug 9.5” 14 bolt semi float? Please explain why it will or will not work, or what you had to do to make it work.

 

[GoToGuy]

Are you saying a whole axle, rotor across to rotor or just the brake parts? Some of the newer trucks the caliper mount is part of the axle tube.

 

[Jerome3521]

Are you saying a whole axle, rotor across to rotor or just the brake parts? Some of the newer trucks the caliper mount is part of the axle tube.

I’m asking if the brake parts from the backing plates out on a 1999-2006 8 lug 14bsf fit on a 1988-2000 8lug 14bsf.

 

[Schurkey]

Seems like a lot of time, money, effort, and enthusiasm for no real benefit.

 

[454cid]

I’m asking if the brake parts from the backing plates out on a 1999-2006 8 lug 14bsf fit on a 1988-2000 8lug 14bsf.

I would expect the spacing to be different and maybe the bolt pattern. I think it would be better to swap the whole axle, but you'll need to move mounts.

 

[stutaeng]

I would expect the spacing to be different and maybe the bolt pattern. I think it would be better to swap the whole axle, but you'll need to move mounts.

This.

I've got a 14 bolt 10.5 FF from a GMT 800 2500HD. I was going to swap into my project truck, but it never happened.

I also have a '00 K3500 and I've pondered on swapping on it. The newer axle Wheel Mounting Surface (WMS) is 1/2 wider. The spring pad perches have to be removed and rewelded as the frame widths are different. I haven't looked into the brake cable or hydraulic hoses... maybe I'll look it over the holiday.


Mine happen to be both 4.10/G80, so no regearing. But as @Schurkey implied, it's a lot of work, especially since my K3500 is not "broken!"

I would think the full float vs semi flat swap would be similar, so probably worthwhile to add that as option... me thinking there's more full float than semifloat axles out there in that generation of trucks.