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  #1  
Old 10-31-2011, 02:56 PM
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2006 3.7L Differential Fluid Change... and more

I have read up on WK jeeps and searched through the forum. It does not seem too difficult to change the front and rear diff fluid. I am going to do this myself to save some $$ as a local shop wanted almost $300 out the door.

I am going to be doing this sometime this week and just wanted to see if there were any recommendations for me prior to starting???

I dont plan on pulling the rear diff cover off. I will just be pumping the old fluid out and replacing. (same with the front) I am going to use Royal Purple 75w140... unless someone has another recommendation. I dont need any additives for this do I? (call me dumb, but my confusion is that I dont know if I have ELSD or not). I dont think my 3.7 Laredo X has it but im not sure.

I would also like to change the t-case fluid. Is this as simple as the diff fluid? It looks like the only real difference is removal of the balancer prior to getting to the drain and fill plugs. Anything special involved with the fluid change? (again, call me dumb, but I think I have the Quadra-Track 1 transfer case- NV140) Just to clairify, I would use ATF+4 fluid correct?

I will also be replacing the PCV valve which seems very straight forward and not a big deal at all.




Sorry in advance for the stupid questions, but any help is appreciated.
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Old 10-31-2011, 08:18 PM
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Re: 2006 3.7L Differential Fluid Change... and more

You wont have to pump out the front diff. and transfer case, both of them have drain plugs. You will have to remove the skid plate for the front diff. though (really easy) I used Mobil-1 for my diffs like many people, but a lot of guys also like Royal Purple.

You will just use normal ATF 4 for your transfer case.

Drive the Jeep around for a bit to warm up the fluids so they drain better. ALWAYS remove fill plug before drain! Fill them slowly to let the fluids settle so you dont underfill and apply some teflon to the plugs when re-installing. The hardest part is getting tools into placed for the front diff and transfer case depending on your setup, but honestly its an easy project.

I would recommend calling the dealership and giving them your Vin and they can tell you if you need additives.

PCV is really easy, just be careful not to break it while removing it.

I believe there are some videos in the tips section as well, good luck!
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Old 11-01-2011, 08:48 AM
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Re: 2006 3.7L Differential Fluid Change... and more

Quote:
Originally Posted by JWeidner View Post
You wont have to pump out the front diff. and transfer case, both of them have drain plugs. You will have to remove the skid plate for the front diff. though (really easy) I used Mobil-1 for my diffs like many people, but a lot of guys also like Royal Purple.

You will just use normal ATF 4 for your transfer case.

Drive the Jeep around for a bit to warm up the fluids so they drain better. ALWAYS remove fill plug before drain! Fill them slowly to let the fluids settle so you dont underfill and apply some teflon to the plugs when re-installing. The hardest part is getting tools into placed for the front diff and transfer case depending on your setup, but honestly its an easy project.

I would recommend calling the dealership and giving them your Vin and they can tell you if you need additives.

PCV is really easy, just be careful not to break it while removing it.

I believe there are some videos in the tips section as well, good luck!
Thank you. I will be giving the dealer a call today to determine if I need additives or not. I really dont think I will since I dont have a towing package or adjustable 4wd. I just have the standard AWD all the time!

I was able to watch the HOW TO maintenance videos on the front and rear diff and the Transfer Case. This doesnt seem too difficult at all, and I am really looking forward to getting everything done.


For the PCV.... is it worth picking that part up from the dealer or can I go with a NAPA or CarQuest Part on that? I just dont know how important it is to go OEM on a part like that.

Again, thank you for the tips.
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Old 11-01-2011, 10:48 AM
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Re: 2006 3.7L Differential Fluid Change... and more

yeah the Laredo's didn't come with anything trick, you have the standard 3.07 front/rear open diffs so no additives are needed

The tcase takes regular old ATF+4 and definitely use the tips posted by JW, those are good tips and will help you in the process GL - let us know how goes!
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Old 11-01-2011, 01:34 PM
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Re: 2006 3.7L Differential Fluid Change... and more

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Originally Posted by soontobesrt View Post
yeah the Laredo's didn't come with anything trick, you have the standard 3.07 front/rear open diffs so no additives are needed

The tcase takes regular old ATF+4 and definitely use the tips posted by JW, those are good tips and will help you in the process GL - let us know how goes!
Just got back from the dealer. I picked up some ATF-4, PCV valve, and 8oz of friction additive (two bottles) for under 40 bucks. They looked up my VIN and said they recommend the friction additive. It was only 8 bucks for both bottles and I dont really think it will hurt anything to have it in there. I talked to the service manager and he said they put it in on all of the front and rear diffs they service.

Thanks for the help guys. I should be getting all of this done over the weekend!
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Old 11-01-2011, 01:39 PM
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Re: 2006 3.7L Differential Fluid Change... and more

If you do not have a limited slip differential it will not hurt to have the additive in there, it would just be a waste of money. Only quadra-drive systems have limited slip diffs as far as I know, the quadra trac's do not. I would be really concerned about using that dealers service dept. if they put it in all diffs, either they are incompetent or at the least pushing an extra sale.
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Old 11-01-2011, 01:44 PM
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Re: 2006 3.7L Differential Fluid Change... and more

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If you do not have a limited slip differential it will not hurt to have the additive in there, it would just be a waste of money. Only quadra-drive systems have limited slip diffs as far as I know, the quadra trac's do not. I would be really concerned about using that dealers service dept. if they put it in all diffs, either they are incompetent or at the least pushing an extra sale.

That was my thouht as well. I even asked him why he would put an unnecessary product into the vehicle. His reasoning was simply, "it gives added protection to the components in the diff, and its not a waste of money." I thought it was weird as well though.

For $8.00 I wasnt too worried about the added cost. I would NEVER bring my vehicle to them for service, but I figured they were competent enough to recommend the correct fluid. But, in the big scheme of things, if they charge $8.00 (with their actual cost being a fraction of that) to include it on each diff service they have, they are making decent money on just that upcharge.
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Old 11-01-2011, 02:00 PM
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Re: 2006 3.7L Differential Fluid Change... and more

After switching to Royal Purple in the diffs and transfer case, I gained about 2mpg on highway.
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Old 11-01-2011, 02:02 PM
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Re: 2006 3.7L Differential Fluid Change... and more

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Originally Posted by 06RC22 View Post
That was my thouht as well. I even asked him why he would put an unnecessary product into the vehicle. His reasoning was simply, "it gives added protection to the components in the diff, and its not a waste of money." I thought it was weird as well though.

For $8.00 I wasnt too worried about the added cost. I would NEVER bring my vehicle to them for service, but I figured they were competent enough to recommend the correct fluid. But, in the big scheme of things, if they charge $8.00 (with their actual cost being a fraction of that) to include it on each diff service they have, they are making decent money on just that upcharge.
I'm not entirely sure, I'm no chemical engineer by any means but I think you are absolutely right, I doubt the friction modifier would offer any extra protection to an open diff compared to the regular gear oil. But thats up to them if they want to shaft the customer.

Anyway, good luck with the work, let us know how it goes, I hope everything goes well!
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Old 11-01-2011, 02:04 PM
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Re: 2006 3.7L Differential Fluid Change... and more

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Originally Posted by misfit77 View Post
After switching to Royal Purple in the diffs and transfer case, I gained about 2mpg on highway.
Wow thats good I dont think my WJ gained that much if any, but all I did was the diffs. I was contemplating using their trans fluid an motor oil, but it never goes on sale so I have stuck with mobil or valvoline for now.
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Old 11-01-2011, 04:38 PM
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Re: 2006 3.7L Differential Fluid Change... and more

If you have any trouble loosening the plugs slap some PB blaster on there and they will come free. My transfer case was on there really good since it hadnt be removed in 70,000 in a salt area....im guessing yours might be the same
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Old 11-01-2011, 08:46 PM
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Re: 2006 3.7L Differential Fluid Change... and more

Thanks for the info guys.

I changed out the PCV valve tonight... EASY job. One question, should there be oil coming from the line that connects to the valve and inside the valve?? My understanding was that the PCV controlled emissions gasses in the crankcase. Maybe a stupid question, but thought I would ask.
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