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1990 GMC Rally Wagon 2500 Questions

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I just changed our heater fan and i get air but no heat just air
I actually have a 1984 GMC Rally STX, but I figure the vehicle and years are close enough. Where can I purchase a used/new pump seal for my Turbo 700R4 transmission?
I put the steering box back in the van, but now it turns sharper to the right than the left. Dose it take shims in between the frame and the steering box? I don't remember taking any off.
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