Hats off to PML Transmission & Rear End Covers

[DwayneKelch]

Les,



Nice shop... appreciate your picture more than the two I posted. Thanks.



I had the Mag-Hytec rear differential cover on my 2001 Dodge/Cummins (6-speed) and experienced a few problems with it; drain plug got stuck (torqued to their specs too) and the cover leaked. Not really a big deal, just a hassle. For what I tow, the 8-quart capacity wasn't necessary either. I read about the problems with Mag-Hytec covers for the AAM and knew that wouldn't be my choice this time around.



Once I discovered the PML covers and scrutinized their quality, the decision to buy them was easy. Their rear cover doesn't add much more capacity over stock, but it will work well for me. Too as evidenced in the photos, I opted, at the advice of DPP (thanks, by the way) for the as-cast aluminum. I really like the PML covers Oo.





Dwayne

 

[JGrosso]

Thanks for the info on the PML diff covers for the 11. 5" AAM axle.

I just ordered one, since it is time to do the axle fluid change anyhow, and my stock cover looks like it has gotten pretty hot while towing (the paint on the center of the cover is gone. )

 

[Mark Craig]

LesStallings,



Ok call and make sure I am here as I need to talk with you about that barn too, looks like what I am planning for later this spring and want your input!!



Mark @ DPPI

 

[Diesel Manor]

Hi John3976,



You mentioned:

I like the Mag-Hytec but was leary of them deleting the top and bottom bolt holes on the cover. I figure AAM put them there for a reason, I also like the stock gasket better then the O-Ring gasket used by Mag Hy-Tec.

I'd like to take the opportunity to just mention why MH does this. They removed the top and bottom bolts to accomodate for the drain plug (btm) and sending unit hole (top). Actually, you can mount the Mag-Hytec cover with every other bolt and still seal and have more strength added to the housing than the PML cover just by the wall thickness and weight of the casting. As for the O-ring seal. It is far superior to any gasket. I've had my MH diff cover on for 3 years now. Removed and reinstalled the cover 2x with the same O-ring seal. No leaks what so ever. The O-ring does not crush. Another nice feature it that there's no gasket or RTV to remove later. If you do need a new O-ring for some reason, I believe they will send you a new one for free. Al least this is what they did for a couple of our customers in the past.



As for powdercoating acting as an insulator. We're going to be conducting a test this Spring to see to what degree, pardon the pun, this holds true. Keep in mind, the MH covers/pans are larger than the PML. More mass, more material for air to come in contact with to cool the cover/pan. Powdercoating can insulate, but I doubt it is does to the extent that some may think. This test will be avaiable on our site once it's complete. All data and criteria will be avaiable in the report for those who wish to duplicate the test.

 

[john3976]

Hi John3976,



You mentioned:



I'd like to take the opportunity to just mention why MH does this. They removed the top and bottom bolts to accomodate for the drain plug (btm) and sending unit hole (top). Actually, you can mount the Mag-Hytec cover with every other bolt and still seal and have more strength added to the housing than the PML cover just by the wall thickness and weight of the casting. As for the O-ring seal. It is far superior to any gasket. I've had my MH diff cover on for 3 years now. Removed and reinstalled the cover 2x with the same O-ring seal. No leaks what so ever. The O-ring does not crush. Another nice feature it that there's no gasket or RTV to remove later. If you do need a new O-ring for some reason, I believe they will send you a new one for free. Al least this is what they did for a couple of our customers in the past.



As for powdercoating acting as an insulator. We're going to be conducting a test this Spring to see to what degree, pardon the pun, this holds true. Keep in mind, the MH covers/pans are larger than the PML. More mass, more material for air to come in contact with to cool the cover/pan. Powdercoating can insulate, but I doubt it is does to the extent that some may think. This test will be avaiable on our site once it's complete. All data and criteria will be avaiable in the report for those who wish to duplicate the test.

A couple of questions on the M/H cover, you said the temp sending unit goes into the top of the cover? Is this temp sending unit different then the transmission temp sending units? I guess I am wondering how the oil gets to it other then splashing on it from the ring gear.



Even if powder coated would the fins not pull the heat away as that is the purpose of the fins on the pan. The PML cover is quite think as well and I doubt that the M/H offers any added stiffness then the PML cover adds. I am not sure if you have handled a PML cover but they are very stoutly built. I think both are good products by the way.



I keep hearing that you now sell the transmission lines with the sender port in it but when I go to your web site I can only find a sending unit block not the entire replacement line. Am I looking in the right place, I ordered one from another vendor before I read that you now sell them, your price is lower, and I have not received the line from the other vendor yet. If the other vendor cannot get me the product I will cancel that order and get a refund and would buy from you if you sell the entire replacement line.

 

[RSByrd]

I have both PML front and rear diff covers as well as the transmission pan, purchased from Mark at DPP. Quality product and quality service.