Question on swapping to a 00-07 GM 14 bolt on my 66 GMC

[wcstory]

I have an opportunity to pick up a GM 14 bolt full floater with disc brakes and 4:10 gears for my 1966 GMC one ton. The friend of a friend has 3-4 SRW differentials pulled from GM 2500HDs ranging between 2000-2007.

I'm about to swap out the front drum brakes and suspension for modern disc brake suspension from a 1989 R3500. Staying with 8 lug one ton gear.

My thinking is the 14 bolt would give me more available parts and a parking brake. I would just have to buy a different portioning valve.

MY questions are:
- Can I use my dual rear wheels over the disc brakes?
- What other hidden surprises am I missing?

[Clyde65]

I think those differentials are much wider that your stock one, like 5-6” wider, have you measured?

[wcstory]

I'm working away from home so I haven't measured either yet.

I was thinking about changing to a SRW because of the hassle of registration and insurance in Massachusetts. I have to register and insure as a commercial vehicle.....

but, I really like the DRW look and with the narrow rear axle the duallys fit nicely under my stepside bed.

[350TacoZilla]

Wow yeah you have the narrow rear, the new axle is going to be wider than what you have. I keep thinking early narrow DRW was around 63.5" WMS and the newer SRW would be near 69"

[wcstory]

Found this reference