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High Flow transmission coolers
Allison transmission cooling

Designed for rugged heavy duty use
Use with transmission, engine and hydraulic oils.
Working pressures up to 300 psi.
High flow Allison transmission cooler applications


Flow ratings listed for normal transmission cooler psi.
BTU ratings at 2500 FPM air flow @ 100 ITD temp.
Most truck fans (17" dia.) move over 2000 FPM!
Allison A540 to 750 series transmissions
GM Duramax, Allison transmission cooling
1000 & 2000 series require 6 to 8 GPM flow rate.

Check your cooler line size first.
Measure available mounting space.
Use Fan Coolers for remote installations

Includes Cooler & mounting kits only!

Cooler Installation Information and Guide



Allison - High flow coolers
Automatic Transmission Parts


Click here for important info on our Transmission Rebuild Kits
Use these 3/4" fitting coolers with 5/8", 3/4" & 7/8" O.D. lines.
High flow coolers - 3/4 fittings Image Price    
DB-1231 High flow cooler - 3/4" fitting, 24.0 x 7.2 x 1.5 Overall size
Flow range 2 - 12 GPM
Heat rejection range 12,000 - 20,000 BTU/Hr at 2500 FPM air flow
Includes (2) DB-515-B mounting kits
$ 139.79  
DB-1268 High flow cooler - 3/4" fitting, 18.0 x 13.0 x 1.5 Overall size
Flow range 4 - 20 GPM
Heat rejection range 21,000 - 26,000 BTU/Hr at 2500 FPM air flow
Includes (2) DB-515-B mounting kits
$ 187.25  
DB-1260 High flow cooler - 3/4" fitting, 24.0 x 13.0 x 1.5 Overall size
Flow range 4 - 20 GPM
Heat rejection range 28,000 - 38,000 BTU/Hr at 2500 FPM air flow
Includes (2) DB-515-B mounting kits
$ 200.56  
DB-1290 High flow cooler - 3/4" fitting, 24.0 x 19.0 x 1.5 Overall size
Flow range 5 - 20 GPM
Heat rejection range 38,000 - 52,000 BTU/Hr at 2500 FPM air flow
Includes (3) DB-515-B mounting kits
$ 250.4  
DB-1299 High flow cooler - 3/4" fitting, 24.0 x 22.4 x 1.5 Overall size
On Special!
Flow range 2 - 12 GPM
Heat rejection range 39,000 - 56,000 BTU/Hr at 2500 FPM air flow
2 pass type cooler, lines are on opposite sides.
Includes (3) DB-515-B mounting kits
$ 283.4  
FK-A1000 Fitting Kit- adapts 5/8 ORB line fitting to 3/4 JIC
Adapter kits for some GM Duramax Trucks that use 5/8" Snap-in cooler line.
Converts the factory 5/8" ORB line fitting to a 3/4" JIC fitting.
Remove cooler line fitting from Radiator or small cooler.
Install MALE ORB (A) - JIC fitting in radiator after checking for same thread type!.
Install Female ORB fitting (B) and Male JIC fitting on cooler line.
Now you can install your TOC hose with JIC fittings to the cooler.
1 fitting each 50JN-12-12, 10JO-12-10, 50NO-12-10
$ 28.28  
DB-515-B Mounting kit for High Flow Tube cooler (1 kit = 2 mounts)
Order as many needed!
2 rubber mounts, 2 brackets & 2 bolts.
Isolates cooler from vibration and offers a secure mount. Special elastomer block installs in header holes (side tubes) and expands when tightened, for a secure hold.
$ 8.54  
Use these 1" fitting coolers with 3/4", 7/8", 1" & 1 1/8" O.D. lines.
High flow coolers 1 fittings Image Price    
DB-1271 High flow cooler - 1" fittings, 30 x 26.75 x 1.5 Overall size
Flow Range (GPM) 4 - 14
Heat Rejection Range (BTU/Hr): 44,500 - 67,500
2 pass type cooler, lines are on opposite sides.
Fitting Size: 1 FPT
Includes (4) DB-515-B mounting kits
$ 371.58  
DB-1292 High flow cooler - 1" fitting, 24.0 x 25.4 x 1.5 Overall size
Flow range 5 - 30 GPM
Heat rejection range 52,000 - 71,000 BTU/Hr at 2500 FPM air flow
Includes (4) DB-515-B mounting kits
$ 334.27  
DB-2305 High flow cooler - 1" fitting, 24.0 x 31.4 x 1.5 Overall size
Flow range 12 - 30 GPM
Heat rejection range 61,000 - 85,000 BTU/Hr at 2500 FPM air flow
Includes (4) DB-515-B mounting kits
$ 407.39  
DB-515-B Mounting kit for High Flow Tube cooler (1 kit = 2 mounts)
Order as many needed!
2 rubber mounts, 2 brackets & 2 bolts.
Isolates cooler from vibration and offers a secure mount. Special elastomer block installs in header holes (side tubes) and expands when tightened, for a secure hold.
$ 8.54  
Fan mounted coolers are great when you can not mount a cooler in front of your engine fans air flow.
Fan coolers assure continued cooling even in Stop & Go traffic.
High flow coolers with Fans Image Price    
DB-343DC-12 High flow - Fan cooler 3/4" fitting, 18 x 12.75 x 6.75 overall size
Flow range 4 - 20 GPM
Heat rejection range 15,100 - 19,700 BTU/Hr
12 volt fan
Hoses, couplers & thermostat sold separately.
$ 582.24  
DB-345DC-12 High flow - Fan cooler 3/4" fitting, 24 x 19 x 6.7 5 overall size
Flow range 5 - 21 GPM
Heat rejection range 22,900 - 31,100 BTU/Hr
12 volt fan

Hoses, couplers & thermostat sold separately.
$ 597.74  
DB-341DC-12 High flow - Fan cooler 1" fitting, 24 x 19 x 6.75 overall size
Flow range 5 - 30 GPM
Heat rejection range 22,700 - 33,000 BTU/Hr
12 volt fan

Hoses, couplers & thermostat sold separately.
$ 582.24  
DB-TCF180 In-line fan thermostat - activates at 180 +-
Screws in to a "T fitting" (customer supplied) in the Inlet side of the Fan Cooler.
1/2" pipe thread on unit.
For DB High flow fan coolers only!
$ 77.72  
Water cooled - Transmission Oil Cooler assembly.
This is totally different from all the other transmission coolers that use Air to cool the fluid.
Water from the radiator flows around the sealed inner transmission cooler.
This is a great low cost choice when you have an original external "water cooled" transmission cooler that is leaking.
This is a aftermarket cooler designed to replace many original type external water coolers.
Designed to REPLACE existing water cooled coolers, NOT intended to be installed as a retro fit!
Heat exchanger - water cooled Image Price    
TDI-13680 Heat exchanger - Transmission Oil Cooler assy. - Water cooled
Transmission oil cooler ports are 3/4" npt
Water cooling ports are 2.25"
Heat duty ~up to 360,000 BTU/hr at 10 to 20 GPM flow rate
Aftermarket replacement oil to water heat exchanger for many motor homes & large trucks.
Overall length = 22.70" +-
Cooler body width = 3.36" +- (excludes brackets)
Overall height = 5.3" +-
Mount bracket bolt holes = 9.75" +- / 5 3/4" +-
Click here for Product flyers from mfg. (pdf file)
$ 624.75  
TDC-19854 Allison 4000 Series Converter Operation Cooler

Transmission oil cooler ports are 1" npt
Water cooling ports are 2.25"
MINIMUM HEAT TRANSFER = 4000 BTU/MIN AT 100F ITD (300-200F), 18 GPM ATF, 80 GPM 50/50 EG/W
MAXIMUM OIL PRESSURE DROP = 40 PSID AT 18 GPM, ATF @ 200F
MAXIMUM COOLANT PRESSURE DROP = 5 PSID AT 80 GPM, 50/50 @ 200F
OIL SIDE = 300 PSIG
COOLANT SIDE = 20 PSIG
MASS (REF) = 34 LBS DRY, 43 LBS WET
VOLUME (REF) = 0.39 GAL OIL SIDE, 0.69 GAL COOLANT SIDE
$ 1359.75  

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New Mail & Ship to Address: Makco Transmission Parts - 755 Grand Blvd, Ste. B105-261 Miramar Beach, FL 32550
Phone 256-767-2840 - 1-877-916-2526 Fax 844-272-9944