I have a 2004 Winnebago Brave with a workhorse chassis and Allison Transmission. When I put transmission to park, it will not hold in forward position. It will hold in reverse, even when I apply the parking brake. I brought to a repair shop and they couldn't find any info on the part or how to fix it. It is very unsafe to drive as I need to jump out and chock the wheels every time I park. Please help if you have any advice. ( Harold, 08/30/2017 )