Ever since I bought the donor with the NV4500 transmission, I have been unsure as to whether the truck was originally a Getrag 5-speed or an A518 automatic. Since it did not have the heat exchanger on the side of the block ot a throttle positioning sensor on the injection pump, I hoped it was an original 5-speed. I knew the current 5-speed was a replacement because it was not a Getrag. My doubt came because the three screw/bolts on the AFC that hold the cover on and also hold the TPS bracket on auto trucks were missing. The reason I was concerned is that the transfer-case input shafts on the auto trucks were significantly smaller and weaker than those for the stick trucks. The automatic equipt trucks have a 23 spline input to the t-case, the 5-speeds came with the beefier 29 spline input.
While I was waiting for my clutch to come from Uncle UPS, I figured I would sepparate the tranny/t-case so I could mock up the tranny placement and figure out what kind of cross member issues I will have.
Gloryosky Batman! I count 29 splines. Thats money I don't need to spend. Both the input on the t-case and output on the tranny have the same 29 spline count!
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