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Old 01-11-2007, 05:28 AM   #1 (permalink)
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Changing differential fluid

I'm going to change my diff fluid in the front and rear this weekend. I was curious if most people just drain and refill? Or do you clean it out with something like some brake cleaner, and then blow out with air, and then refill.

Also what fluid should I be using?

Thanks
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Old 01-11-2007, 10:01 AM   #2 (permalink)
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i would like to know as well i have a 4.10 rear ( does that make it a LSD ? )
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Old 01-11-2007, 10:33 AM   #3 (permalink)
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I believe if you tow you should use 75w140. If you don't you can go 80w90 I believe.
Front will use 75w140 for sure.
You can have a LSD on any gear set. In your glove box, there should be a sticker stating if you have LSD.
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Old 01-11-2007, 10:42 AM   #4 (permalink)
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i just did my rear not all that long ago and i used AMSOIL 80-90 full synthetic..that gear oil is ok for a LS diff...i drained , cleaned with brake-parts cleaned blew out with air gun and refilled.....i bought a 1gal container and there is about 1inch left in the bottom of the container....my rear is the dana 70.....i believe the dana 80 hold more oil...
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Old 01-11-2007, 02:53 PM   #5 (permalink)
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I usually drain mine, and clean it out good with brake cleaner (at least 1 big can). There is a magnet in the bottom of the rear diff, clean that off good with a lint free cloth. Clean the cover off and paint the outside as well. Use blue or grey RTV to seal it back up.

Rear takes around 5 quarts to fill and make sure you use a bottle of limited slip additive from the dealer. 80W90, 75W140 - your choice - Synthetic in the rear is the best way to go.

Last edited by Dr. Evil; 01-11-2007 at 02:56 PM.
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Old 01-11-2007, 03:28 PM   #6 (permalink)
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Like posted, drain and clean. Lint free rags are a must in here. Clean the inside first, so while you clean the cover the inside can dry while you clean the cover.

Some say 75W-140, but I think not. If using a quality Synthetic, you will have no issues towing with 75W90 unless you are towing WAY too heavy. Amsoil comes LSD compliant, but you MAY have to add a small amount of additive. Only way to tell is to fill it and make a series of very tight figure 8 turns and listen and feel for rear end chatter.
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Old 01-11-2007, 05:22 PM   #7 (permalink)
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I dont think I have a limited slip. How can I tell for sure? I can spin on of the rear tires pretty easy. And when up on a lift, I can spin one and the other will spin the oposite direction. This means its an open diff correct? Should I still stick with full sythetic? So can I get away with a 75w90 on both the front and back? I dont do any towing, but I might this summer. It wont be alot of weight though.
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Old 01-11-2007, 05:25 PM   #8 (permalink)
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Sounds like you have an open diff, and you will be plenty fine on 75W-90 Amsoil. As for the other gear lubes available, I really can't comment on the protection they afford.
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Old 01-11-2007, 11:08 PM   #9 (permalink)
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Originally Posted by SMOKNISB View Post
I'm going to change my diff fluid in the front and rear this weekend. I was curious if most people just drain and refill? Or do you clean it out with something like some brake cleaner, and then blow out with air, and then refill.

Also what fluid should I be using?

Thanks
First off go out for a good drive. Get the diffs nice and hot. The take it home. Get a bucket that can hold at least 2 gallons for the rear diff. Pop the cover off and let it drain. Go have a snack or lunch. Then wipe out the inside of the dif with a rag to get the last bit out. Clean everything up. Grab some silcone and run a bead on the cover and bolt it up. Fill the diff with lube.

I just done a thread here about changing gear lube early and often. I found that with the cold weather, snow, rain etc... You need to change it often. My front axle had a good quantity of water in the lube.




This what happen if you dont change fluid often enough... I'm changed my schedule to 20K miles to reduce the chance of getting water in the fluid again...

I've been using Dino 80W-90 gear lube for 95K miles and no problems. It cost me only $40 buck for 5 gallon bucket... Really good deal! :thumbsup
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Old 01-13-2007, 12:03 AM   #10 (permalink)
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75W-90 for your application, synthetic and don't even mess with Dino oil.

Use a paper cover gasket WITH a light bead of silicone to hold it in place. Don't just use sylicone, it will usually seep.
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Old 01-13-2007, 12:20 AM   #11 (permalink)
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75W-90 for your application, synthetic and don't even mess with Dino oil.
I can buy a 5 gallon bucket of gear lube for 40 bucks and change the gear lube often to help keep the water out. Which Synthetics are too expensive to dump early and often... I sure I can't get synthetics that cheap...

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Use a paper cover gasket WITH a light bead of silicone to hold it in place. Don't just use sylicone, it will usually seep.
I've got 95K miles and NEVER had a leak with just a bead of silcone sealing the diff cover.
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Old 01-13-2007, 12:21 AM   #12 (permalink)
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First off go out for a good drive. Get the diffs nice and hot. The take it home. Get a bucket that can hold at least 2 gallons for the rear diff. Pop the cover off and let it drain. Go have a snack or lunch. Then wipe out the inside of the dif with a rag to get the last bit out. Clean everything up. Grab some silcone and run a bead on the cover and bolt it up. Fill the diff with lube.

I just done a thread here about changing gear lube early and often. I found that with the cold weather, snow, rain etc... You need to change it often. My front axle had a good quantity of water in the lube.

This what happen if you dont change fluid often enough... I'm changed my schedule to 20K miles to reduce the chance of getting water in the fluid again...
You make a great point, and I agree completely. You need to regulary service the diffs. I still hold my ground, however, that the quality synthetic oils still offer more wear protection and better performance (mileage/heat).
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