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.