Transmission Oil Cooler Ice Box Inside this universal 5.5 gallon ice box is a Derale 25 row bar and plate transmission cooler. This box is designed to keep things cool while on the transbrake. Lets face it, some guys will try to burn you down at the tree, a good defense against this is a solid cooler for the trans. Dimensions are 14.25" Length 12" Width (the side with fittings) 8.25" Tall.