1977 GMC Jimmy drivetrain issues

1977 GMC JIMMY
5.7L • V8 • 4WD • MANUAL
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IAMH8ED
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A buddy of mine did a tranny swap... then after about a year of driving it crapped out. So he replaced it with the original tranny that came with it and its acting exactly as the blown tranny did... the first tranny worked fine but he wanted to use a different transfer case. To explain how its acting, the engine starts and runs fine. When we put the truck in gear and attempt to drive, it will drive only on flat surfaces. The instance we try driving up a small incline it stops moving forward, but the engine doesn't stall out. What could be causing this problem??
Jan 20, 2015 at 4:54 PM
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IAMH8ED
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I didn't check over my work when writing this. Its an automatic 350 transmission, not manual, with an np205 transfer case
Jan 20, 2015 at 4:57 PM
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CADIEMAN
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THE TORQUE CONVERTER COULD CAUSE ALL THIS NO PRESSURE.
Jan 20, 2015 at 5:08 PM
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