DPD

Over the past 15 months I have just about completely rebuilt everything on my 2003 Dodge Ram 2500 and the one place which provided me with all the information I needed to solve problems, such as your 48RE failing mysteriously with no warning signs to direct you in fixing it, is the Cummins Forum website -- (39) 03-07 Powertrain | Cummins Diesel Forum There are some very good experienced highly skilled members there who know the 48RE inside and out and I am quite sure they will point you in the right direction. There are many good posts provided on the 48RE. And perhaps the owner of this website will provide excellent advice as well. I have learned a great deal of essential information here such as fixing my torque converter cycling problem using his info and links to other sources which provided exactly what I needed.

I have my 48RE built heavy duty at a local shop which specializes in 48REs which cost about $6K and is now capable of towing the truck's maximum weight and also can handle 1000 hp. However, my truck will never have more than 650 hp, if that. The 48RE when built correctly addressing all known weaknesses is an excellent transmission. I added a Full Send Diesel trans cooler unit which keeps the fluid temps in the 120-140 degree range.

Congrats, may you both have many years of harmony together as you rebuild life the way you prefer it to be. Stay Strong.

I recommend keeping the heat exchanger but replace the OEM unit with the one Full Send Diesel designed, which is an all-billet solid unit with two totally separate areas which cannot rupture and cause crossover contamination between the coolant and the trans fluid. These units also cooler far more efficiently due to being solid billet design. Combine this unit with their heavy duty high flow transmission cooler and your transmission will remain cool even in the most extreme conditions. My coolant temps with sensor in the deep pan never gets above 150 degree in the month of August in Florida.