Hey everyone I have a problem I got this truck from my uncle its been sitting in his barn for 12 years got it running it idles a little rough but that's not the issue the issue is I can but the truck in drive and it drives OK in drive but as soon as I put it in reverse and let off the brake it dies the trans has been rebuilt before but along time ago I need to know if anyone has any ideas on what it could be and how to fix it