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-   -   NV247 T-Case Fluid FYI and Lesson Learned... (https://www.jeepforum.com/forum/f310/nv247-t-case-fluid-fyi-lesson-learned-4430825/)

Daveykid 04-19-2021 03:04 PM

NV247 T-Case Fluid FYI and Lesson Learned...
 
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Just want to share with everyone a bit of a lesson learned on the T-Case fluid we all know should be used for the NV247. When I bought my 04 Jeep GC Overland, I noticed the typical slow speed tight turn grinding/rubbing (call it what you want) and knew at the very least the T-Case fluid should be flushed and filled. So, rather than doing it myself or having my own shop do it post purchase, I called up the place I bought it from and explained to them what was happening. They explained to me they flushed and filled it as part of their inspection service on Jeeps before they put it on the lot but they'd be happy to do it again for me. They told me to bring it by so I did, figuring I'd save myself a few bucks. They claim to be a Jeep "expert" sales and service facility with the three owners having over 20 years experience each at a Jeep dealer and on their lot is about 75% Jeeps. Ok, so far so good.

They did a second drain and fill and I pick the truck up a few days later and yes it's still doing the same thing so now I'm thinking perhaps it's the coupler itself that is shot. Just over 60K miles on the truck though so I'm having a hard time believing that...quite yet. I call them back up and asked them if they could tell me exactly which fluid they used for the T-Case because I said if I needed to add any I didn't want to mix fluids. (I didn't want to give them an excuse to come up with a BS response). He said they used Valvoline Synthetic T-Case Fluid #855459. Based on my research I can't find that there is any friction modifier in it and it seems to be used primarily for CVT transmissions. Aside from that, Valvoline themselves say it is compatible with ATF-4 fluid, which is what we are not supposed to use anymore. So irritating.

I get the car into my shop, we drain it, refill it with the Mopar NV247 T-Case Lubricant and lo and behold, the T-Case quiets down. I did a bunch of figure 8's in an empty lot to speed up the process but so far so good. Glad it solved the problem but mad at myself for trusting the other shop in the first place.

Don't cut corners. Ask questions when in doubt. Always use the right fluids. :grin2:

underscore 04-19-2021 04:35 PM

You definitely have to be on top of these things yourself, unfortunately. I had the local Jeep dealer try to give me the wrong power steering fluid for my WK. If you put the wrong stuff in, not only can you trash the whole steering system, but the hydraulic cooling fan as well. I had to drag the manual in and show them the part number to get the correct stuff.

blueseasons1 04-19-2021 04:44 PM

The Tcase fluid is ridiculously easy to change. Gravity does most of the work. Remove the lower plug and the fluid drains out. Put that plug back in and remove the top plug. Dump in 2 quarts of the right juice and your good to go for 30k miles. Its actually easier than an oil change.

Daveykid 04-19-2021 07:25 PM

Quote:

Originally Posted by blueseasons1 (Post 41253473)
The Tcase fluid is ridiculously easy to change. Gravity does most of the work. Remove the lower plug and the fluid drains out. Put that plug back in and remove the top plug. Dump in 2 quarts of the right juice and your good to go for 30k miles. Its actually easier than an oil change.

I agree it is but I have access to a lift at my race shop and it's an excuse to have a little bourbon after hours with the boys while one of the guys there (not drinking of course) does the job. :laugh2:

Aside from that though, always loosen the fill plug first in case it gets stuck or stripped. That way you will not have drained out the case yet and rendered your truck undriveable. Just my 2 cents!

WJ60 04-19-2021 08:58 PM

I had a shop change out the pinion seal in the front diff. As soon as I got it home I changed out the fluid because I wanted to know it was the right stuff.

mak_v8 04-20-2021 03:10 AM

Quote:

Originally Posted by Daveykid (Post 41253563)
Aside from that though, always loosen the fill plug first in case it gets stuck or stripped. That way you will not have drained out the case yet and rendered your truck undriveable. Just my 2 cents!

Quote!!!

HarryH3 04-20-2021 08:27 AM

Quote:

Originally Posted by blueseasons1 (Post 41253473)
The Tcase fluid is ridiculously easy to change. Gravity does most of the work. Remove the lower plug and the fluid drains out. Put that plug back in and remove the top plug.

Good advice, but two steps are backwards. :surprise: ALWAYS remove the fill plug first. Sometimes it is ridiculously over-tightened and/or corroded in place and just doesn't want to come out. If you discover this after draining the t-case then you're in a world of hurt. Make certain that you have the ability to do the refill before you remove the lower plug and drain out the lube.

Daveykid 04-20-2021 11:58 AM

Quote:

Originally Posted by HarryH3 (Post 41253781)
Good advice, but two steps are backwards. :surprise: ALWAYS remove the fill plug first. Sometimes it is ridiculously over-tightened and/or corroded in place and just doesn't want to come out. If you discover this after draining the t-case then you're in a world of hurt. Make certain that you have the ability to do the refill before you remove the lower plug and drain out the lube.

:grin2:

UKXJ 04-20-2021 12:39 PM

Probably the 1st really useful thing I learned from U-tube.

OP might be well advised to change the diff. oil now.

Daveykid 04-20-2021 08:20 PM

Quote:

Originally Posted by UKXJ (Post 41253989)
Probably the 1st really useful thing I learned from U-tube.

OP might be well advised to change the diff. oil now.

Yup! That's next week. And a complete trans flush and two new filters as well. About the only thing done right was an oil change and even at that I'm not sure what they used.

UKXJ 04-21-2021 11:58 AM

The Jeep specialist (didn't you say?) that doesn't understand that WJ's are at least different (many would say special) - scary!

I wouldn't worry too much about the engine oil, in the grand scheme of things it's not that important - but there are few mechanical components as particular about fluids as the Quadradrive drive line.

Daveykid 04-22-2021 08:33 AM

Quote:

Originally Posted by UKXJ (Post 41254675)
The Jeep specialist (didn't you say?) that doesn't understand that WJ's are at least different (many would say special) - scary!

I wouldn't worry too much about the engine oil, in the grand scheme of things it's not that important - but there are few mechanical components as particular about fluids as the Quadradrive drive line.

I basically took matters into my own hands and ordered all the fluids myself and I'll have my shop do it all. I should have never trusted the sales shop to any of this but like I said, lesson learned!


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