Was your truck built on a cab and chassis style frame? If so, you would need the # TGMFK35C for suspension enhancement. An easy way to determine is to measure the outside to outside dimension of your truck frame. If that distance is 34 you have a cab and chassis truck. There are only Timbrens available for this configuration.
If you do not have a cab and chassis you would instead want the Air Lift kit part # AL57128 as it is the most similar to the product you mentioned. Or, the Timbren... view full answer...
The Derale 24" Frame Rail Fluid Cooler with -6 AN Inlets # D13225 is a great option. It does not require lines to the front of your truck to cool your transmission. There is not a longer option available, but you can run the Derale 17" Frame Rail Fluid Cooler with - 6 AN Inlets # D13221 as well if increased cooling is desired and you need to be under 45 inches.
You may also be interested in the Derale -6 AN Female Swivel x 3/8" Barb Hose Fitting # D98200, Derale High-Temperature Replacement... view full answer...