Diff cover question
JK Enthusiast
Joined: Feb 2007
Posts: 229
Likes: 0
From: H-Town, PA
Actually, DO NOT fill your new aftermarket diff cover up to the bottom of the fill hole especially if it's located higher than the factory location. By doing this, you will have over filled your diff and the gear oil will be sitting in-line with the axle vent tube. And, once you start driving around, you will find that your gear oil will start pumping out of this tube and make a stinking mess of your passenger side rear fender well.
What you need to do is just fill your diff to the required amount as stated by the FSM which is about 2 quarts. For detailed instructions as to what to do, click on the link below to see my write-up. Granted, this was done on a TJ but it really is all the same stuff
Dana 30 Differential Cover Installation Write-Up
Dana 44 Differential Cover Installation Write-Up
What you need to do is just fill your diff to the required amount as stated by the FSM which is about 2 quarts. For detailed instructions as to what to do, click on the link below to see my write-up. Granted, this was done on a TJ but it really is all the same stuff
Dana 30 Differential Cover Installation Write-Up
Dana 44 Differential Cover Installation Write-Up
And Yes i am one of the idiots that found this out the hard way. Now i blow oil everywhere i go... Need to find time to drain a little bit out.
JK Enthusiast
Joined: Feb 2007
Posts: 207
Likes: 0
From: Aurora, CO
Actually, DO NOT fill your new aftermarket diff cover up to the bottom of the fill hole especially if it's located higher than the factory location. By doing this, you will have over filled your diff and the gear oil will be sitting in-line with the axle vent tube. And, once you start driving around, you will find that your gear oil will start pumping out of this tube and make a stinking mess of your passenger side rear fender well.
What you need to do is just fill your diff to the required amount as stated by the FSM which is about 2 quarts. For detailed instructions as to what to do, click on the link below to see my write-up. Granted, this was done on a TJ but it really is all the same stuff
Dana 30 Differential Cover Installation Write-Up
Dana 44 Differential Cover Installation Write-Up
What you need to do is just fill your diff to the required amount as stated by the FSM which is about 2 quarts. For detailed instructions as to what to do, click on the link below to see my write-up. Granted, this was done on a TJ but it really is all the same stuff
Dana 30 Differential Cover Installation Write-Up
Dana 44 Differential Cover Installation Write-Up
Last edited by onsafari; May 1, 2007 at 12:18 PM.
JK Enthusiast
Joined: Feb 2007
Posts: 229
Likes: 0
From: H-Town, PA
Hmmm never had a problem with gear oil coming out of my breathers before. Either with my TJ or the JK stock or lifted. I will say it is a must to overfill you diff once you lift it and rotate the pinion angle up. That's why the hole is higher than that of a factory cover.
JK Enthusiast
Joined: Feb 2007
Posts: 207
Likes: 0
From: Aurora, CO
No...rotating a pinion only occurs when you lift the vehicle. It helps to get the driveshaft back in line with the differentials and helps cure any driveline vibrations.
Last edited by onsafari; May 1, 2007 at 12:19 PM.
JK Enthusiast
Joined: Apr 2007
Posts: 478
Likes: 0
From: Weare, NH
Hey Eddie,
I have a RockCrusher D44 diff cover that I picked up when I had the TJ. Never installed it, and it's sitting in my garage whispering..no..calling..no..SCREAMING my name now. Correct me if I'm wrong, but the bolt pattern for the JK D-44 is the same, right? This should bolt right up.
I have a RockCrusher D44 diff cover that I picked up when I had the TJ. Never installed it, and it's sitting in my garage whispering..no..calling..no..SCREAMING my name now. Correct me if I'm wrong, but the bolt pattern for the JK D-44 is the same, right? This should bolt right up.
JK Jedi Master
Joined: Oct 2006
Posts: 15,133
Likes: 0
From: O HI 4 Lo
Hey Eddie,
I have a RockCrusher D44 diff cover that I picked up when I had the TJ. Never installed it, and it's sitting in my garage whispering..no..calling..no..SCREAMING my name now. Correct me if I'm wrong, but the bolt pattern for the JK D-44 is the same, right? This should bolt right up.
I have a RockCrusher D44 diff cover that I picked up when I had the TJ. Never installed it, and it's sitting in my garage whispering..no..calling..no..SCREAMING my name now. Correct me if I'm wrong, but the bolt pattern for the JK D-44 is the same, right? This should bolt right up.
JK-Forum Founder
Joined: Jul 2006
Posts: 36,534
Likes: 16
From: Laguna Niguel, CA
JK Enthusiast
Joined: Apr 2007
Posts: 478
Likes: 0
From: Weare, NH
Ok, just got off the phone with Grant from Rock Crusher.
Like answered above, it will bolt right up. And it will require more fluid than a standard cover. His rule of thum is to take your index finger and poke it all the way into the hole, and point down. The fluid should JUST touch your finger tip. Also he stated that you will need 1/2litre (500ml) more of fluid than stock. Bloke is an Aussie, hell of a guy too!
Like answered above, it will bolt right up. And it will require more fluid than a standard cover. His rule of thum is to take your index finger and poke it all the way into the hole, and point down. The fluid should JUST touch your finger tip. Also he stated that you will need 1/2litre (500ml) more of fluid than stock. Bloke is an Aussie, hell of a guy too!
JK-Forum Founder
Joined: Jul 2006
Posts: 36,534
Likes: 16
From: Laguna Niguel, CA
EDIT: Never mind, SCF just answered my question
And Yes i am one of the idiots that found this out the hard way. Now i blow oil everywhere i go... Need to find time to drain a little bit out.
