Good question. Which axle do you have in rear? Does it have hubs
passing thru wheels or are they flush with drum? (10.5 FF or 9.5 SF)
Also if you make this change you will need to change wheel cylinders,
master cylinder and and it may mess with ABS calibration too. I am
curious, why do you want the unpgrade?
Actually your brakes are not that small. You might consider changing
wheel cylinder to one with about a 1/16 to 1/8 inch bigger bore to
apply more clamping power to brakes, The larger 3.5 inch drums (I have
them on my 2000 K3500 SRW) asfitted on the 10.5 FF axle not the 9.5 SF
you have and I am not sure that they will fit your axle. I have done
this wheel cylinder trick before and it can help a lot sometimes. My
guess is that as it sit very little braking power is being done by
rear axle now and shoe last a long time. On turning drums, I have
mixed opinions on that. Usually it is around 060 to 090 overized and
it is usually stamped into drum too. The reason I am not a fan of it
is that if you turn them because they are warped you wind up with
uneven metal thickness and a thinner drum which is more prone to warp
again. Basically when i do a brake job I will have the lip only turned
out of drum, not whole surface and if surface of dram is badly
grooved, I replace it.
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