Tranny value????

[mindhive]

I'm hoping someone here will help me out. I'm inquiring as to what a 3 spd OD tranny out of a 68 GMC 3/4 ton 2wd with a I-6 is worth. It says M20 on the tailshaft housing after the OD adapter plate. I have someone who is interested in buying it and I have no idea what it is worth. I just want some comments as to what is fair for both buyer and seller assuming it needs some reconditioning. I know the tranny works but am unsure of the OD the electric solenoid clicks when power is applied to it so it may be good.

Thanks for your help.