Hi all. My 2003 3500 with 318K shifts like a top except going into OD you have to wait until it hits at least 50mph and I like to lope along. The problem is I plow comercially with an 8. 5 ft Western plow and when its slick I am forced to stay in 1st 2nd most of the time because it won`t shift up till we hit open road dry pavement and wind on into 50 plus mph. Would installing a new Gov. solenoid myself be all that bad. Ive read many many posts about new ones installed but nothing about where its (solenoid)located ,accesability... . Its like all these posts are taking it in to a shop. We do alot of our own work to save the money during slow times as we are self employed. Any help much appreciated.