What would be the best to put in the diffs? The severe gear 75w-110 or the 75w-90? All I ever pull is my bassboat and want the best for mileage. Also how much do I need to order for both diffs? Thanks

 

75-90 is all you need.

 

I would suggest REDLINE over amsoil.


I have used a lot of Redline throughout the years, loved it and had much success with it. Haven't used amsoil in anything but a motor, but will NEVER buy anything from the company again!!!

 

I am going to try the 115 in the rear to see if I can keep paint on my diff cover!

 

Why the Amsoil diss anyways???????

 

Ive got redline 140 in the rearend of my truck and have still lost the paint off of it. Maybe the 115 amsoil will work for ya though.

7qrts should do the job, a little less then for the front and a little less then for the rear, if I remember correctly

 

I also changed my paint...to Powder! It better hold. I hate orange pumpkins under my lift!

 

You guys are experiencing flaking/peeling of your diff already with 04 & 05 trucks?

My 03 looks great and it should be looking like crap due to all the salt/sand up here in the winter months. You all must tow heavy loads in hot weather then huh?

 

It must be the 575 hp going to the ground!

 

Could have something to do with runnin dual 34x12s too or single 37x13s, and towin on top of that.

 

I'm running the AMSOIL 75w-110 in both front and rear diffs, they say that its best for fuel economy and extreme duty. At the time that I change fluid I also put on Mag-Hytec covers front and rear, and it took all but a 1/4 of a quart out of a case. 11.75 quarts total.

I am running Amsoil in tranny and transfer case and have good luck, since I have change to amsoil I noticed that my tranny temps run cooler on average!

I personally recommend Amsoil, I have used it for years in my race sleds and I have never had a motor failure. Before we ran Amsoil we constantly had exhaust valve problems (sticking) and lost a crank to bearing seizure.