Here I am

PML or Mag-Hytek covers

Attention: TDR Forum Junkies
To the point: Click this link and check out the Front Page News story(ies) where we are tracking the introduction of the 2025 Ram HD trucks.

Thanks, TDR Staff

Quadzilla Commander

Ac/ Heater Blower Failure

Status
Not open for further replies.
I would like to add an aftermarket cover for both the diff and trans but I'm torn between the sand-cast finish of the PML which will shed heat better but doesn't have the capacity versus the Mag-Hytek covers which increase capacity by quite a bit but the heat rejection might be hindered by the powdercoated surface. the price difference doesn't bother me as much as getting the maximum heat reduction for these essential fluids. A significant part of this trucks existance will be pulling a 9K 5er.



Please pass on your thoughts.



Regards, John
 
Last time I bought the PML covers (front and rear) because they had both available, but they were came with a black powder finish. They are nice quality units, and install with the factory gaskets and stainless steel hex bolts. The only thing I did not like was how small the fill and drain holes are.



This time around I will be going with the Mag-Hytek, as they have more fluid capacity and now have a front cover available for the AAM axle. I think the Mag-Hytek look a lot better as well. I'm not too crazy about the 0-ring seal, but it seems to work just fine.



I never ran diff-temp gauges, so I cannot say if there was an improvement in temps.



Max heat reduction will probably be with the PML... Look at Nissan full-size and Ford diesel differentials. They're finned bare aluminum IIRC.
 
I chose the MagHytek covers for both the front and rear diffs because of the extra fluid capacity, nice dipstick - good place to take a sample for oil analysis, and also their appearance- -but the looks wern't as important as the function.



I cannot remember what the temp differences were stock vrs the Mags - but it was a decent amount. My neighbor decided on the PML's, we measured both his before and after temps. They did not cool as much as the Mags. We both changed to Amsoil Severe Gear 75w140 fluid. We both did a test run of temps before the change, did the same mileage to warm things up. Then we both repeate the same mileage to check the temps after the installs. We both have 3500 SRW CTD's, so you can't get much closer in comparisons as we did.



CD
 
To heck with all the technical BS, the Mag-Hytec just looks cooler. I can't really imagine that the temp differences between the two could be that significant; gotta be better than stock. Plus, when you call Mag-Hytec, that guy is really easy to talk to and he gives good information quickly. He/they get my nod.
 
From a engine perspective, excessive paint can act as an insulator, trapping excess heat in the block... I think that was the idea the OP had about the powder coating.



I think anything aluminum is going to shed heat better than the steel cover.



That said, I have an ORU rear cover...



steved
 
Thanks guys for the reponses.



CD - I think your comparison suggests that I might be a little too concerned about the powdercoating and that the added capacity and greater surface contact area may outway the better heat dissapation of the light sand cast surface.



My understanding is that dark colours absorb heat quicker - dark roofs seem to melt off snow and frost quicker than light coloured ones.



And the Mag-hytec's are purdy.



Again, thanks for the responses



regards, John
 
Yup, them Mag-Hytek covers sure are purdy!!!

I don't think I'd buy the PML's unless they were available powdercoated.
 
Making me look GOOD!

CD:



You and your neighbor are true CTD geeks. I'm going to show your post to my wife so she realizes I am not as bad as she suspects.
 
2 nights ago I wanted to check the rear diff level and I couldn't get the dipstick out of the Mag. A viseGrip easily chewed up about half the stub on top. I might never get around to checking it again.

If PML is smarter with their dipstick/drainplugs than Mag, get the PML. Nothing dumbererer than a 1" (or so) plug with a 1/8" allen head for removal. Removing the whole cover to bust the dipstick or drainplug loose kinda defeats the purpose.

And yes, I oil the seals before re-installing them. It's just a retarded design.
 
Thanks guys. I appreciate the comments. A bit of anti-sieze on the dipstick at initial install might not be bad idea then. Anyone noticed any clearance issues between the deeper Mag-Hytec diff cover and the spare tire?



Regards, John
 
I used anti-sieze on my dipstick threads when I put on my covers, also, you do not have to torque it in just snug it up, it will not back itself out.



Thanks WhiteSheep - 'CTD geek' works for me, no truer a spoken word. My neighbor was all about the paint,temp,etc stuff and I told him not to sweat the small stuff because it's actually a small area to be concerned about and that the increased fluid was more significant to the picture. Next thing you know he's off on the tangent that we could do the temp checks, etc so he could prove me wrong. I added a little 'wager' into the mix, fired him up even more to prove his point. So actually, the whole temp thing was an unintended experiment on my part, just a neighbor gone wild.



If you want to really take this paint stuff theory to the max, it IS true that too much paint can cause heat to not dissipate properly over the gradient surface BUT the semiconductor industry found that with heat sinks if they coated part of the surface/interior of the fins and left the ends uncoated, the fin area actually held the cooling air temps from the uncoated ends into the base plate area of the heat sink, without coating the fins the benefits of the heat sink concept was lost or minimal. Same applied to heat sinks used with turbine engines. The turbine engine people are the ones who were behind the development of materials that lead to ceramic coating that we use today. That's why heat sinks work more effectively when partially coated the way the are in most applications. Taking that a step further into the MagHytek covers and their coating design, it may be that besides making these covers pretty with the unpainte fin ends, that technique actually has a purpose/mindset behind it.



CD
 
2 nights ago I wanted to check the rear diff level and I couldn't get the dipstick out of the Mag. A viseGrip easily chewed up about half the stub on top. I might never get around to checking it again.



If PML is smarter with their dipstick/drainplugs than Mag, get the PML. Nothing dumbererer than a 1" (or so) plug with a 1/8" allen head for removal. Removing the whole cover to bust the dipstick or drainplug loose kinda defeats the purpose.



And yes, I oil the seals before re-installing them. It's just a retarded design.

No, it is a good design it uses the o-ring to seal. It does not need to be over tightened to seal. I have seen many goons over tighten all kinds of fastners that doesn't make it a poorly designed fastner :-laf



The dipstick only needs to be snug-not snug plus. Same thing on the trans drain,It uses an o-ring also.



Bob
 
Thanks guys. I appreciate the comments. A bit of anti-sieze on the dipstick at initial install might not be bad idea then. Anyone noticed any clearance issues between the deeper Mag-Hytec diff cover and the spare tire?



Regards, John

If you have an oversize spare or a heavy 2wd you may want to use some means to pull the spare towards the rear bumper to insure no contact,most just use a motorcycle hold down strap. Some go to the trouble of moving the winch slighty towards the rear.



Bob
 
I Have The Pml

Just put the PML Transmission cover on my 2008 Mega 4X4 with the 6-speed

auto. After running it for a couple of days, the temps were so low I thought I

had a bad sensor... . we checked it with a butane torch and infrared gun and the gauge (DiPricol) reading was within 5-10 degrees of each other... when we

took the torch away from the sensor it was necessary to act fast to get a

good reading because the PML dissipated the heat to fast... ... I've had the

Mag-Hy before on another truck and they work well also... the PML that I

got added 3 quarts to the transmission... so far the highest temp I've seen

was 130 degrees and that was pulling 8,000 lbs onfairly level ground with

the air temp around 80 degrees.
 
No, it is a good design it uses the o-ring to seal. It does not need to be over tightened to seal. I have seen many goons over tighten all kinds of fastners that doesn't make it a poorly designed fastner :-laf

The dipstick only needs to be snug-not snug plus. Same thing on the trans drain,It uses an o-ring also.

Bob
What makes it a poorly designed fastener is that the hole is 8 times the size of the allen wrench you need to open it. Even a little stickiness can cause major problems. I haven't tightened mine (dipstick) more than finger tight for years... and it's still stuck.

Regardles of how easy it is to put a little anti-seize on there, it shouldn't be neccessary. A good design would take care of that.
 
Status
Not open for further replies.
Back
Top