2001 F350 7.3 Powerstroke Best Auxiliary Transmission Cooler D13105 vs D13504
Updated 03/17/2026 | Published 03/10/2026
Products Featured in This Question
Question:
D13105 or D13504, which will offer more cooling, stacked plate or larger face area ? It would be used with the factory cooler, so either would work, but might as well get the best one. Temps are not terrible anyway. 2001 F350 7,3 PSD 4x4 towing 12K 5th wheel
asked by: Bill
Expert Reply:
Hi Bill, if you are looking for the most cooling between those two, I would go with the Derale part # D13504. Even though the part # D13105 has a larger face area, the D13504 is a plate and fin style cooler, and that design is generally more efficient at pulling heat out of the fluid than a tube and fin cooler of similar size. So if your goal is to keep temps steadier on long grades while towing your 12K fifth wheel, the D13504 is the better choice.
Since you are keeping the factory cooler in place, the typical best practice is to plumb it in series so the fluid goes from the transmission to the factory cooler first, then through the aftermarket Derale cooler, then back to the transmission. That way you get stable temps year round and the Derale cooler works as the final heat drop after the factory cooler has already done its part.
What trips are you planning this season with the fifth wheel, and are you running a trans temp gauge on that 7.3 yet?
Steviec
3/13/2026
Bill I've had an excellent experience with the D13504. I tow my 31 ft. Crossroads with a 2017 Chevy Suburban with the 5.3 ltr. engine. It has never gotten above 190/195 degrees.
Heather A.
3/17/2026
Ralph
3/13/2026
Installation was easy and placed in front of AC condenser. My 2009 Tahoe did not have a factory installed transmission cooler and often ran between 185 and 200 degrees. Now it runs about about 140 degrees in summer but runs too cool in the winter baily getting over 130 degrees in stop and go traffic and 110 degrees at highway speeds. I am actually thinking about replacing the cooler with a smaller one. It did go up to about 160 when towing a 3500lb boat.
Product Page this Question was Asked From
Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class IV - Efficient
- Transmission Coolers
- Plate-Fin Cooler
- Full-Size Truck
- SUV
- Standard Mount
- 11W x 12T x 7/8D Inch
- With 11/32 Inch Hose Barb Inlets
- Derale
more information >
Featured Help Information
Instructions
Continue Researching
- Shop: Transmission Cooler
- Shop: Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class IV - Efficient
- Shop: Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class III - Efficient
- Shop: Derale Radiator Adapter Fittings for Ford and Lincoln
- Shop: Derale 19-Row Stacked-Plate Transmission Cooler Kit, -6 AN Inlets - Class V
- Shop: Trailer Wiring
- Q&A: Measuring Temperature of Transmission Fluid After Installing Aftermarket Cooler on 2011 Silverado
- Video: Feature Review Derale Radiator Adapter Fittings for Ford and Lincoln
- Video: Ultimate Overview of the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets
- Video: An In-Depth Look at the Derale 19-Row Stacked-Plate Transmission Cooler Kit, -6 AN Inlets
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: Derale 25-Row, High-Performance, Stacked-Plate Cooler with -6 AN Fittings - Class V
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Search Results: trailer hitch
- Video: How to Choose a Trailer Brake Controller
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Trailer Hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Video: Fifth Wheel Towing Made Simple with Daniel
- Search Results: trailer wiring
- Search Results: trailer tires and wheels
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Shop: Suspension Enhancement
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Brake Controller
on Transmission Coolers
Bill
3/12/2026
Temp gauge/sender is screwed into the test port on trans, so reading may be questionable. Still, as I remember high peak was 190, so not terrible. Upgrading/adding addition cooler, even if not really needed, is a minor expense, compared to cost, time, and inconvenience of losing a trans on the road or even replacing it at home. Also thinking of adding a finer filter as long as I am breaking into the loop. Thoughts ?