Where are you guys getting your synthetic gear oil for the diffs? Time to change mine again and I'm getting tired of paying $80 for 7qts of synthetic gear oil. Can't seem to find it locally by the gallon.

 

We buy Royal Purple here by the drum or, 5 gallon pail.
I am not sure on the exact cost per quart, but I will check, and get back to you.

 

Schaeffers has it in 5 gal. Craig

 

I've bought Royal Purple gear oil on line with good luck - saves a few $ for each quart, and I just buy the 12 quart case

 

I bought RP from XtremeDiesel.com when I changed it in Jan of 08', they had the best price. Next time I plan to run Amsoil Severe Gear, I just didn't have the time to get it last time.

 

Thanks for the info guys. I was in Checker yesterday and they had Valvoline Synthetic 75w-90 advertised on the shelf for $8.99/qt. Went to check-out and the oil rang up as $11.99/qt. After some wrangling they let me have it for $8.99. Already did the fluid change last night out in the garage.

Also, found out my local Amsoil dealer just switched to Redline. He's about $12/qt too so I may go that route next time.

One more item of interest, as I was logging the differential fluid change in my maintenance manual, a little slip of paper fell out, I believe it was a TSB I printed some time ago. It was labeled "Rev A" and stated that the gear oil should be full synthetic 75w-140 in the rear and dyno 75w-90 in the front. Both the owners and shop manuals say synthetic 75w-90 front and rear.

Oh well, already dun it.

 

Are you sure this TSB was for a Ram 2500/3500? The Ram 1500's require 75w140 in the rear axle. I haven't heard that our HD trucks use 140 weight.

Look closely at this TSB.........and notice the fluid for 2500/3500 trucks vs. Durangos and Ram 1500s...etc....

http://dodgeram.info/tsb/2004/03-001-04A.htm

..

 

SOhappy,

The TSB you're talking about was for the 1500's pickups with 8.5 and 9.5 axles and not the 2500 & 3500 with 10.5 and 11.05 axles. I don't know why you had to pay $12.00 a Qt for Amsoil gear oil being it retails for $12.75 that is unless you did not spend the $10.00 to join and to be able to buy at wholesale prices. FYI I can buy Amsoil from my dealer cheaper then I can buy Royal Purple retail at NAPA.