OK, i see your point......never really thought to much about the oil filters. I automatically figured that they could handle the miles without a problem....Presently i am using Mobil 1 oil filters, which i BELIEVE is capable of handling the oil and miles..If not, then i might try something else.

 

so if i dont have LSD then what fluid do i need?

royal purple gear oil 75/90?

 

No Mazola Corn oil....since you don't have LSD....then when your truck gets a little older you can switch to 75W-90 Gear Lube...

 

Just joking...Not really sure. Maybe one of the others will chime in...

 

75w-140 recommended for Chrysler 9.25 rear...

 

ok. ill pick up some 75/140 royal purple gear oil when i head back to work in like 10 minutes

 

I didn't read the entire thread, but there is a lot of apples to oranges compaisons here. The 2500 uses no friction modifier in the newer trucks as they use a totally different type of unit that does not use friction clutches. Friction modifier is supposed to be used on friction type units even if you use synthetic lube. The 4 oz vs the 5 oz spec on how much modifier has to do with which year and rear end manufacturer was used. The older Dodges used the Dana differentials and they called out a 5 oz. spec. I know because I had a '98 with the Dana. The newer trucks with the American Axle rear end uses 4 oz of friction modifier. Dealerships in my area get around $8 per 4 oz. bottle. The older trucks also did not spec out synthetic rear lube as they do now and the viscosity spec changed with that as well.