Dana67Dart said

If you pull the rear drum and measure the distance horizontally from shoe outside to shoe outside what distance do you get?

Now measure the I'd of the drum. Are they almost the same?

Where I'm going is adjustment might be your issue.

Also does your master cyl have residual pressure valve.

Are the front brakes hooked to the rearmost port, and the rear brakes to the front most port of the MC?

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SGBARRACUDA said

I've got to ask, why Toyota backing plates and drums? This opens up a lot of questions. Are the pins long enough, the ones in the wheel cylinder? Shoes adjusted up where they should be

PO got a narrowed dana 60-Chevy 6 lug..I'm guessing the original ends cut off...1980 toyota has a 6 lug drum 10×2..ect..but with smaller wheel cylinders I gather
Narrow and respline axles..

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