03CTDCO - as long as it's certified Gl-5 I believe, you are good. Some folks report chattering/noises using the Amsoil 75w90, and I've been one of them. I switched to Mobil 1 75w90 synthetic and have no more noise issues.

 

Lightman

Thanks
Is a new gasket needed when pulling off the old cover
and replacing it with a new PML cover ?

 

For you guys that did the PML swap already, did the stock gasket fit
and was it needed if your careful and try to salvage the old one ?
Trying to figure out if I need to order a new one.
Does DC allow a form a gasket like Permatex ?

Thanks

 

I used my stock gasket and it fits perfectly on the PML cover. It's rubber and reusable.

MikeyB

 

MikeyB
Thanks for the help.
Is the gear lube sold in qts ?
10pints = (the breakdown per units)
5qts, or 1.25 gal, or 4.73 litres, or 160 oz
5 qts is a huge amount of fluid. Didnt realize
the rear end was that big !!...yikes

Thanks

 

Yes, the gear lube is sold in qts. With the stock cover the refill is about 3.8 qts. Adding the PML cover brings it up to about 5 qts.

MikeyB

 

MikeyB
Thanks, I picked up 5 qts of Mobil synthetic GL-5 75-90W today during lunch.

 

Yes
Yes
No
No

The following is right out of my Dodge Repair Manual.

DESCRIPTION - AXLE
NOTE: DaimlerChrysler recommends using MoparT
lubricants or lubricants of equal quality.
FRONT AXLE
² C205F - Mopart Gear Lubricant 75W-90
² 9 1/4 AA - Mopart Synthetic Gear Lubricant
75W-90
REAR AXLE
² 9 1/4 - Mopart Synthetic Gear Lubricant 75W-140
² 10 1/2 AA - Mopart Synthetic Gear Lubricant
75W-90
² 11 1/2 AA - Mopart Synthetic Gear Lubricant
75W-90
NOTE: Trac-LokT differentials require Limited Slip
Additive in the lubricant. Trac-Rite™ differentials
DO NOT require Limited Slip Additive.

 

So is the Mopart Synthetic Gear Lubricant 75W-90
GL-5 like the Mobil 1
I have a std 3.73 LS rearend, so is it a trac rite or trac lock ?

 

03CTDCO,

You shouldn't need a new gasket, the OEM one is usually a viton material and you can reuse it easily, if not just use high temp silicone and it will do the job for you anyway. Remember you won't be taking it off agiin as it has a drain to service the diff anyway.

Call us if you have any questions, and on all the 2003+ trucks check the glove box for the axle ID info before you call to order. We have seen a number of trucks with axles they weren't "supposed" to have and it saves reshipping the correct/incorrect cover to you. Plus you don't have an empty diff waiting around for a correct cover this way!

Mark @ DPPI

 

I haven't seen anyone mention Red Line fluid for the differential. A local store carries Red Line 75W-90. Do you all think this would be ok to use? I'm a 2WD and not a limited slip.

 

03CTDCO

I'm not sure who manufactures the Mopar Gear Oil however, I will say Mobile 1 Syn. is great. I use to use it, had absolutely no problems in the past on any of my vehicles. I don't want to start an oil war here so I'll just say I believe all synthetics are fantastic.

I can't say for sure which diferential you have since I have the 2004.5, which has the TracRite in it........I would say your 03 is the same. Below is the link to the AAM site if you want to learn a bit more on the difs......perhaps give them a call and they will tell you exactly which one you have.


http://www.aam.com/technology/tech_prod_dl_diff.html

 

I'm sure the product will work well and is probably fantastic. Only downside is if you had a warranty issue, it's not officially GL5 certified like the mobil 1. I wouldn't hesitate to run it though.

 

Thanks for the suggestion Lightman. I think I'll just use some Mobil 1 and have all the bases covered: synthetic and GL5 certified.

 

hi, I am interested in a replacement diff cover with a drain in it such as those mentioned here. I would like to upgrade both front and rear diffs.

question for you guys, I upgraded to 315 tires and my 315 spare barely clears the factory diff cover, these extra capacity diff covers, will they allow me to continue with my 315 spare?

thank you in advance