I have a 1997 gmc yukon when the truck gets warmed up then transmission slamms into gear when u take off and only does it in the first shift. After that the rest of the gears shift ok. When u come to a stop it shifts fine in then when u taker it slamms into the first while in motion. When u turn the truck off it dont into gear unitill u get the truck warmed up. Does that sound exspensive to fix.