Q. Should I delete my heat exchanger / torque converter cooler?
A. MPT does not recommend deleting the heat exchanger. In scenarios where there is limited air flow moving across the front of he vehicle, the heat exchanger ensures that the fluid coming out of the torque converter stays below 200°. If you keep fresh coolant in the engine, you greatly lessen the chances of antifreeze-to- transmission oil transfer. Heat exchanger failure is a very isolated occurrence.
Q. My transmission temperature is reading 220°. Is it overheating?
A. If your temperature reading is coming from ANY OBD-II style monitor (Edge monitor, Bully dog, Smarty), readings are typically 40° higher than the average pan temperature. If your reading is coming from a sending unit in the pan, 220° is on the brink of overheating. 99% of the time when we receive this particular inquiry, the operator is referencing an OBD-II style monitor.
Q. What kind of fluid should I use with a MPT transmission? Does brand matter?
A. We recommend Dexron/ Mercon fluid in our transmissions. As long as the fluid meets Dexron III specification it is safe to use. Do NOT use synthetic fluids that exceed Dexron III spec. Brand does not matter.
Q. What type of filter do I use when servicing my 47/48 transmission?
A. We prefer the early style felt filter found in RH model transmissions. Ask your parts provider to lookup a filter for a 1995 Ram 2500 Diesel. The filter will be tan/ yellow in color and will NOT have a plastic bottom.
Q. When I put my truck into gear first thing in the morning, it takes longer than usual to start moving, it feels like the transmissions is slipping.
A. If this condition is only exhibited after the vehicle has sat for a prolonged period of time (greater than 3 hours), it is normal. Over time, the fluid from the torque converter drains back into the transmission pan. The solution is to run the truck in neutral for 30-60 seconds to charge the converter before initial take off.
Q. How often do I service my transmission?
A. This varies depending on the application. We recommend servicing hot rod/ full manual transmissions more often than automatics. As a general rule of thumb, service every 15,000 miles for hot rod/ extreme applications and every 30,000 miles for daily driver/ conventional applications. Full manual transmissions also are constantly cycling the low/ reverse band, so it does not hurt to check that adjustment once a season.
Q. How do I adjust my bands on my transmission, what is the specification?
A. To adjust your automatic valve body equipped transmission, torque the front band to 72 inch pounds and back off 1-3/4 turns. The rear band adjustment adjustment is 72 inch pounds, back off 3 turns.
For full manual applications, we torque the front band to 72 inch pounds, back off 1-3/4 turns. For the rear band, torque to 72 inch pounds, back off 2 to 2 and 1/4 turns. We like to set the low/ reverse servo arm free play at 1/4" on manual valve body applications.
Q. What stall speed torque converter will work best for my application? Can I run a lower stall speed?
A. Our general guidelines go as follows:
We use a maximum of 2000 RPM stall speed on trucks equipped with an 87MM turbine manifold turbocharger.
If the manifold turbocharger turbine is greater than an 87MM, we recommend going with a (looser) 2200-2500 RPM stall speed.
Running a lower stall speed (1800) is appropriate for very lightly modified trucks that still run small/ stock turbochargers. A lower stall (tighter) converter will enhance shift feel, increase fuel economy and decrease transmission temperatures. On 2003-2007 trucks, 1800 RPM stall speed will cause a P1740 code. This code will trigger the check engine light. On 1998.5-02 VP44 equipped trucks with hot rod injection pumps/ big injectors, 1800 RPM stall speed can cause the engine to stall when initially going into gear.
MPT uses 2000 RPM by default. It is the perfect balance for shift feel, no check engine light and allows for substantial engine upgrades without having to restall the torque converter.