I am not sure if the T-150 and T-176 have similar shifter covers but if they do, the shift rods have grooves in them with a ball bearing and spring in the shift cover. When you shift into a gear, the poppet spring pushes the ball into the groove and holds it into place.
I don't think I have a picture of my shift cover disassembled but I will post a picture of the inside for comparison.
It would be worth a try to rebuild (disassemble and clean) the shift cover.
1978 Cherokee, 360/T400/QT...5.3/4L60E/NP241C in the works...
Last edited by 243; 05-01-2010 at 08:21 PM..