Rear End Fluid. What Type?

[nevinst]

Had my truck for a while now and need to (would like to) replace the lube in the rear end. I am showing evidence of leakage on right side seal and some on front seal. Nothing that causes spots in the driveway or anything, just oil on the outside. Should I bother fixing these first?



I remember reading several posts about people's preference to particular types of lube. Also some mention about DC's recommendations for a different variety other than what was original. Can't find any on-going posts so would like info/opinions.



Thanks

 

[craftybigdog]

I like amsoil

I run amsoil in both pumpkins. I run it in my quad, John Deere Z-trak, I guess everything and I love it its great, hasnt let me down yet!!!!!!!!!!

 

[Mactruck]

I run the Amsoil series 2000 75w90. I run this because I don't tow much. They claim better mileage because of the thinner weight of the oil. I run it inside a Mag-Hytec so I can hold more fluid. If you tow alot You should use the Factory recommended spec of 75W140. This is thicker and can handle the stressful high temps caused by towing.



I'll tell you one thing. I changed my rear end fluid at 10,000 miles before a long distance trip to Colorado. The fluid that came out looked awful . I was glad I changed it. I then put the 75W90 in and have run it for 12,000 miles since. It is still a good clearish color with very little sign of wear. I think the Mag-Hytec cover helps alot because of the magnetic dipstick. Every few thousand miles I check the fluid and clean the metal shavings off the dipstick(which are inevitable, no matter which lube you use)



For the front differential (based on posts I've read here) A fluid change probably isn't needed till at least 30,000 miles. The reason is unless your driving in 4 wheel drive all the time, the fluid isn't getting the wear that the rear is getting. In posts i've read people changing the front at 30,000 miles and the fluid is still clean.

I'll be changing it soon anyway because of the introduction of the Dana 60 front diff cover. Oo.



This isn't meant as a plug for Amsoil. I'm not a dealer for the product. Just a satisfied customer. At bare minimum, use a good quality Synthetic oil.

 

[LSMITH]

I use Mobil 1 75W-90 and am perfectly happy with it. Unless towing heavy and often I would use the 75-90 weights. Be aware that the leaks could get worse and you could end up losing a $30-50 charge of oil if you take it in to get fixed after you change it. I prefer to fix a leak at the very first sign. Be sure to get the rear diff full to avoid seal and bearing problems. Hope this helps.

 

[BigMike]

I've got the Mag-Hytec with Amzoil 75-140. Just had it done this week, so don't have any experience yet. Seemed to be the general recommendation on numerous previous posts that this was the way to go if you intend to tow.

 

[RJOL]

I'm going to use Royal Purple Synthetic oil:



http://www.royalpurple.com/mgearr/mgearr.shtml



Just looks like a real good product... .

 

[bspence]

I recently changed mine at 50k and used Richmond Gear's GL-6 synthetic gear oil (75w-140). The GL-6 rating is the highest I could find. I got it from SummitRacing.com.



Blane

 

[RustyJC]

I tow right at my truck's GVWR (10,380 lbs actual vs 10,500) and GCVWR (21,180 lbs actual vs 21,500) pulling our 5ver (see signature). I'm using Royal Purple synthetic 85W-140 and am very pleased with the performance. I didn't have to add any Mopar friction modifier - the Royal Purple has friction modifier built into the formulation, and I've had no LSD chatter whatsoever since changing from the stock hypoid gear lube to the Royal Purple.



Rusty

 

[BigDaddy]

AMSOILed Powertrain

When it was time to change the powertrain fluids I had three things in mind:

Proven compatibility/reliability

One stop source

Most bang for the buck



AMSOIL met this criteria and then some.



AMSOIL Series 2000 75W-90 Gear Lube in the front and rear (sig. links)



You can get great prices on AMSOIL through the Group Purchase Site. When you get there just click on the AMSOIL Logo.