Rear slip yoke

[Jesse 67 c-10]

Well I have my 327 and 5 speed in and running but I'm working on the driveshaft right now. I didn't want to pay $120 for a new slip yoke and there are no 5 speeds in Saskatchewan to rob a yoke from. My tranny has a 32 spline output shaft. I managed to find a 32 spline yoke off something in a yard that fits the splines but the outside diameter is too big to fit in the tranny. I know some one with a lathe and I'm going to get it turned down to fit, what I'm wondering about is if the yoke has to be a certain size, I know on a th350 the yoke slides over the splines and into a bushing to support the output shaft, if the yoke is to small it won't ride on the bushing and I'm sure that would toast the tranny. Does anyone know if a 5 speed would also have this bushing, or is the shaft supported by some other means? I don't want to turn down my yoke too small. Hopefully someone knows what I'm talking about!
Thanks
Jesse

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Near Saskatoon, Saskatchewan, Canada. 67 c-10, Long fleet, Newly swapped front disks, 5 lug rear end, 327 v-8 with Vortech heads, edlbrock performer rpm air gap manifold, 1406 carb and comp XE 256 cam. Backed by a getrag 5 speed and 1 piece driveshaft. Finnally running, almost driving! www.geocities.com/chevy67jesse