jdn112011
Well-Known Member
- Oct 18, 2015
- 1,253
- 344
- Truck Year
- 2015
I was borderline between severe service and regular maintenance so I opted to do the fluid change on my 3.55 limited slip at about 29k and 1 year old.
Ram differentials do have drain plugs which is very helpful! Located to the passenger side behind the casting for the fill and cover. But it requires a rather odd bit. A 9/16 hex, and or a 14mm Allen wrench. The latter of which I was able to find locally at the Fleet Supply store for $4 opposed to purchasing a $30+ oversized hex socket set which I really did not need.
Anyways from there on the drain is rather simple, be sure that you are level, and pull the plastic plug first to vent the drain.
I drove around a bit being as 75-140 is a bit thick and warming promotes an easier drain. But the factory fill gear oil is very foamy. As shown.
After replacing the drain plug. Refilling, full synthetic 75w140 gear oil. Many have limited slip additive already. I like and use Mobil 1 so I Used that. Quantities are not very clear for fill but it takes a little under 3qts. Dealer parts guy told me almost 35$ a quart for fluid and 3.5 capacity.
I did use the mopar friction modifier which I mixed into the last quart. You can fill directly from a gear oil bottle though you will not get quite the whole thing without lowering or removing the spare tire, I just transferred remaining fluids into the next container to utilize as much a possible.
Capacity again is just under 3qts
Spray it down with brake cleaner afterwords and good to go.
Ram differentials do have drain plugs which is very helpful! Located to the passenger side behind the casting for the fill and cover. But it requires a rather odd bit. A 9/16 hex, and or a 14mm Allen wrench. The latter of which I was able to find locally at the Fleet Supply store for $4 opposed to purchasing a $30+ oversized hex socket set which I really did not need.
Anyways from there on the drain is rather simple, be sure that you are level, and pull the plastic plug first to vent the drain.
I drove around a bit being as 75-140 is a bit thick and warming promotes an easier drain. But the factory fill gear oil is very foamy. As shown.
After replacing the drain plug. Refilling, full synthetic 75w140 gear oil. Many have limited slip additive already. I like and use Mobil 1 so I Used that. Quantities are not very clear for fill but it takes a little under 3qts. Dealer parts guy told me almost 35$ a quart for fluid and 3.5 capacity.
I did use the mopar friction modifier which I mixed into the last quart. You can fill directly from a gear oil bottle though you will not get quite the whole thing without lowering or removing the spare tire, I just transferred remaining fluids into the next container to utilize as much a possible.
Capacity again is just under 3qts
Spray it down with brake cleaner afterwords and good to go.
Last edited by a moderator:
