Frequently Asked Questions

Frequently Asked Questions.

Should I delete my heat exchanger / torque converter cooler?

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.

What kind of fluid should I use with a MPT Transmission? Does brand matter?

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.

How often do I service my transmission?

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.

What type of filter do I use when servicing my 47/48 transmission?

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.

How do I adjust my bands on my transmission, what is the specification?

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. We like to set the low/ reverse servo arm free play at 1/4″ on manual valve body applications.

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.

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.

What stall speed torque converter will work best for my application? Can I run a lower stall speed?

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 reinstall the torque converter.

Testimonials

    
 
 
         
   Josh Campbell 
 
 
 
 Trustindex verifies that the original source of the review is Google. I purchased a stage 3 47re from muldoons needless to say I’m very impressed with the shifts and lockup! These guys know their way around dodge transmissions, truly the best in the business!
  
 
        
   Thomas Snow 
 
 
 
 Trustindex verifies that the original source of the review is Google. 68RFE stage 1… By far one of the best experiences iv had at a shop. From scheduling and explaining what I need and getting it done fast. What made it even better, I showed up to pick up my truck “ from Virginia” and John was supposed to leave early. I uploaded my tune and it was incorrect… he stuck around 3-4 hours until I revived my new tune to make sure I could get it done right and head home. Definitely earned a life long customer and I will recommend this place to anyone!
  
 
        
   Mike Smiley 
 
 
 
 Trustindex verifies that the original source of the review is Google. Muldoons Diesel Performance is a legitimate company, they were great to deal with and I am very satisfied with the outcome. I highly recommend John and his team to anyone looking for a built transmission.
  
 
        
   Michael Fanelli 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had an issue. 2wd slip yoke bushing manufacturing defect or mix-up.  After I sent them a measurement, they came to my house with new parts, crawled under my truck, and rectified the issue.  Mistakes happen.  John dropped everything and got me taken care of.  These guys really take pride in their work, and it shows.
  
 
        
   Tammy Allen 
 
 
 
 Trustindex verifies that the original source of the review is Google. John was patient and amazing to work with. Very knowledgeable and helpful. A++++ customer service.
  
 
        
   Eric Bost 
 
 
 
 Trustindex verifies that the original source of the review is Google. Another 5 star review for Muldoon’s! They were great to work with, I scheduled with them a few weeks ahead of time so that I could limp my truck up from NC with no overdrive / losing my torque converter, and they had a new Towmax installed in 1.5 days! Big thanks to everyone at Muldoons, the transmission is doing great so far and I have been asking a lot of it!
  
 
        
   Isaac Mcneal 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great people, amazing customer service and quality workmanship. What more could you ask for!
  
 
        
   brandon wells 
 
 
 
 Trustindex verifies that the original source of the review is Google. Quality parts. And the guy who packed my stuff was not afraid to used packing paper. Stuff was packed tighter in that box than a nuns rear. Slightly disappointed I didn't get any stickers though 😂
  
 
        
   Darren Furlong 
 
 
 
 Trustindex verifies that the original source of the review is Google. So way back in 2019 I decided to upgrade the 68rfe. I called Muldoons diesel made the apt and drove all night to be there first thing in the am. So now 5 years later still going strong   Highly recommend John and crew for 68rfe trans rebuilds!   Have not had any issues would go back again. Actually thinking of reaching out to see if there are any updates and just do a refresh on the trans.

instagram videos

Team bonding, Office Space style 😎🖨️

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Team bonding, Office Space style 😎🖨️

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Not all gifts are great, but the gift of a Muldoon’s transmission is!

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Not all gifts are great, but the gift of a Muldoon’s transmission is!

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Never too busy for TikTok time!

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Never too busy for TikTok time!

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Your day can’t be ruined in you ruin theirs first!

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Your day can’t be ruined in you ruin theirs first!

#muldoonsperformancetransmissions #diesel #transmission #cummins #ram

Low reverse bushing height is one of those tiny details that can make a huge difference.

Set it right. Don’t guess.

#muldoonsperformancetransmissions #68rfe #DieselPerformance #BuiltRight #diesel

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