I read here often, and have for many years, but never have posted.
I have an '85 pickup that began life as an automatic; I installed a Marlin built R151F this weekend, and find it won't shift into 5th or reverse. It has been almost 10 years since I had the tranny built; it has sat in its' packing for that long as projects came and went, but yesterday I pulled the old failing automatic out and swapped in the Manual.
My presumption is that Marlin built it correctly, so my question is what are the possibilities? All the clutch components are new. The tranny shifts very smoothly from first through 4th gear, but won't go into 5th or reverse. I tried driving it a while to get it warm and loosen things a little. My presumption is that something is stuck inside the tranny, possibly from sitting, but it has been sealed in side a few bags in a box in a climate-controlled environment.
Have any of you had this issue, or do any of you know what is the matter?
Thanks in advance>