I have a drive shaft for a 904 in a 85 swb truck
I have a driveshaft for a 727 in a swb truck
I have a drive shaft with splined slip yoke for a 727 short shaft bolt on yoke.
I have run them all.
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if the truck came with a 318/904..use the shift lever/TV lever from the 904 on the 727 for shifter linkage hook up. you may need to tweek the 904 TV linkage or find a 4-v 727 truck 1 piece TV linkage.
the auto trans lines will fit from the 904 to 727.
all you need to do is shorten the 904 swb drive shaft to fit the longer 727.
the 727 will need a bigger 727/a8333/a833OG slip yoke. slide yoke in till it bottoms out on tailshaft,measure from center of u-joint cap to center of u-joint cap then subtract 1" for a perfect fit.
the measurements can vary slightly when searching for a bolt in shaft, or if the truck has had cassis mods such as lowering/axle flips...they tend to shorten the shaft even more.
check the size of flex plate from the 904 TC to the 727 TC before you get it bolted to the engine. they are the same for all engines, TC bolt spacing/size dictates which flex plate to use.
best to mock the flex/TC together and mark with paint for ease of install later bolting it up.
good luck
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