F.A.Q.

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 more efficient stall speed is appropriate for very lightly modified trucks that still run small/ stock turbochargers. A lower stall (tighter, more efficient) converter will enhance shift feel, increase fuel economy and decrease transmission temperatures. With 2003-2007 model year trucks, a more efficient stall speed can cause a P1740 code. This code will trigger the check engine light to come on. The vehicle's computer interprets the more efficient torque converter as a dragging lockup clutch, and will trigger the OD/TCC solenoid code. This is nothing to worry about, and unfortunately one of the small cons to running a more efficient torue converter. On 1998.5-2002 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 and allows for substantial engine upgrades without having to restall the torque converter. 

Use our Find Your Transmission tool or browse by transmission type to narrow down the correct products for your truck. Review the application and fitment information on each product page before ordering.

For a personalized recommendation, contact MPT.

MPT transmission build levels are designed around how the truck is used and how much power it makes. Lower build levels are intended for stock or lightly modified daily-driven and towing applications, while higher stages use upgraded components and calibration for increased horsepower, aggressive driving, competition use, and harder launches.

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. 

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.

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.

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.  For your 68RFE transmission, use MOPAR OEM filters only.

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 2-3/4 to 3 turns turns. We like to set the low/ reverse servo arm free play at 1/4" on manual valve body applications. 

Yes. A 68RFE requires a relearn after installation or any tuning reflash. Keep throttle below 50%, avoid towing, Tow/Haul, and exhaust brake, and complete at least 500 miles of stop-and-go driving over a minimum of 3 days with overnight hot-to-cold cycles.

Yes. MPT 47RH, 47RE, and 48RE transmissions require a break-in service at 1,000 miles. MPT 68RFE transmissions require a break-in service at 5,000 miles.

Yes. Before installation, MPT requires the transmission cooler and lines to be professionally hot-flushed. If they cannot be properly flushed, the cooler lines must be replaced.

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 engine in neutral for 30-60 seconds to charge the converter before initial take off. 

Complete the core return form to process your return. Drain all fluid, securely package the core, and make sure it matches the product purchased. Cores should be returned within 2 weeks of receiving the product; late returns are subject to a $25-per-day reduction. MPT inspects each core for completeness, damage, corrosion, and reusable components before issuing any refund. Core refunds are issued back to the original method of payment. Deductions may apply for damage, missing parts, heavy debris, or an unacceptable core.

Core inspections are typically completed within about two weeks of receipt. Once approved, the core credit is refunded to the original method of payment. Processing time may vary if the core is incomplete, damaged, or requires additional evaluation.

Our typical lead time is 2–3 weeks, but it may vary depending on product availability and current workload. Shipping time is additional and depends on the delivery location and carrier.

Yes. All MPT transmission warranties are non-transferable, begin on the invoice date, and cover transmission workmanship and materials when the transmission is installed by MPT or another professional shop. When installed by another professional shop, the warranty registration form must be completed within 30 days for warranty eligibility.

47RH/47RE/48RE Superstock, Towmaxx, Stage 1, and Stage 2: two-year, unlimited-mileage warranty

47RH/47RE/48RE Stage 3, Stage 3.5, and Stage 4: one-year, unlimited-mileage warranty

68RFE Stage 1 and Stage 2: two-year, unlimited-mileage warranty

68RFE Stage 3 and Stage 4: one-year, unlimited-mileage warranty

Exclusions and MPT’s rights apply. See our complete Warranty Information for all terms and conditions.

To maintain warranty eligibility, your transmission must be professionally installed, the cooler and lines must be hot-flushed or replaced, required pressure and tuning checks must be completed, and all service intervals must be performed by a transmission shop with detailed records. Ship-out and local-pickup transmissions also require the applicable warranty registration documents to be submitted within 30 days. Do not tamper with the transmission, and follow all MPT tuning, tire-size, gearing, fluid, filter, and core-return requirements.