I understand that they would like to promote their own products, but I was kind of disappointed that three of the gear oils that I've used & thought were good products were at the bottom of their list. Mopar, Royal Purple, and Lucas.

 

Agreed. You will find most of these "bench" tests used for comparisons have little or no significance in real world applications. It is, what it is, marketing propaganda.

 

My '95 2500 2WD had Amsoil in the rear-end when I got it at 56,000 miles, and it also had a leak around the pinion shaft. I changed it out to regular old 75W140 and it hasn't leaked since then. I just change it every 24-30,000 miles. I've got a MagHytec extra-capacity cover on it. I've got 254,000 miles on it with no problems. Amsoil will cause some seals to leak. Some people who change to Amsoil report no leaks and some do.

 

Stea ler can tell you what came stock on your truck if given the last 8 digits of the vin. There may also still be a tag on the drive train parts.

 

Amsoil. might be hype, but from what I've seen I "buy" into it. I have Amsoil in every cavity of my truck, engine oil tested every 30,000kms/ 1000hrs, comes back fine for continued use. as for the gear oil I had a toyota with 80w90 in the tranny/TC and on a cold morning (-30C) with the TC in neutral and letting out the clutch would STALL the engine, because the oil was so thick,also almost inpossible to shift when cold. switched to 75-w-90 and rpms would drop about 100, and truck would shift as it would if it was a warm sunny day... been convinced ever since
my truck has 490,000kms on it. I put 200,000 on it in the past 3yrs, I switched it to Amsoil when I bought the truck...which reminds me I need to change the rear end oil

sorry if I'm biased, proud Amsoil user here

 

These rear ends are exposed to pretty intense torque inputs and heat as well, Amsoil for this guy here as well, it really isnt that expensive either.
I think I paid 13$ a quart for some Amsoil Severe gear, NAPA's synthetic gear oils start at 20$.

 

If you over service most things with any kind of lube it will either leak, overheat or cause catastrophic failure... Except maybe the NV5600.

 

what weight gear oil are you running in front & back on the dodge?

 

I also use Amsoil and I use 75-90 in the front and 75-140 in the rear, my truck is used almost entirely for towing but only up to 14,000lb.

 

some how missed this post,,,
I was running 75-90 front and back, but have some 75-110 sitting on the shelf when ever I get around to doing it

 

I'm running Mobil one in mine and have in all of my vehicle, no issues with any of them, engines or gearboxes.

 

do you guys use silicon for the gasket or do you get a new gasket all together?

 

I have used silicon sealant with no leaks.

 

Reason I was a bit disappointed to see the information in this article was because I just spent about $200 putting Royal Purple in my front and back end of my truck. Royal Purple didn't fare very well when put up against other gear oils.......it flat out failed a lot of the tests....funny thing is that mopar gear oil finished close to last in the test....

 

you can get RTV gasket maker in any auto store. Just be sure to get the black stuff.....