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Want to see what you guys think on this subject. Couple of things, one is why do we need to run atf+4 and not something like even 10-30 motor oil or some similar weight hydraulic fluid. And two I'm in process of messing with my leaky tcase from rear output seal. I changed it for the 3rd time now, but this time I changed tail bushing too, it got deformed up on install at the oil drain grove, at least driveshaft feels tight now. It did have a drip after first trip but now it's seems ok. Some residual fluid from lubing it on install maybe.IMG_20201003_123524.jpg.05b643c6d575c1c5b2e8c8b6896ca6db.jpg

So I just want to flush tcase for some reason.

Question is what do you think would happen if anything :think: if I mix matched different trans fluids for let's say 10miles just to flush it out and go back to atf+4. I'm thinking it should be just fine as tcase is not a transmission and doesn't really need all the additives to run right. Plus I have this fluid on the shelf that I'll never use and figured it would be an honor for it to go out this way. Older models called for atf+3 and dextron3 and I heard of some that tried hydraulic oil before. 

Sure I can just drain what I have in there and put new stuff in and call it a day or go get some cheap atf+4 and flush with that but what fun would that be. This is what I got sitting around some of it for last 15 years or so. No rush take your time :cheers:IMG_20201005_191236.jpg.c85715af7d63d2927c48cd1280f1210d.jpg

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I say use it up and flush that sucker. You will need to drive in 4x4 or jack up all 4 and let it run in 4x4 for a few minutes. If you don't the chain wont turn and slosh the fluid around. Just driving around in 4x2 won't stir it up. I used ATF+4 for years but now use Motorcraft 5w/30 synthetic blend, same as my Ford Escape engine oil.

 

 

 

 

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14 minutes ago, NIsaacs said:

You will need to drive in 4x4 or jack up all 4 and let it run in 4x4 for a few minutes.

I got that cable posi lock on the front I can put tcase in 4x4 and leave the cable out, it should do it I would think. The cad won't be engaged, but front shaft will spin. Thanks for the confidence :thumb1: I figured this whole atf4 is warranty thing, not that it doesn't work, just feel that in something like tcase it should be simple.

If I remember right you also use 15w40 in your nv5600?

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3 minutes ago, NIsaacs said:

Yes, I use 15w/40 in my NV5600,

How many miles have you put on it so far with 15w40, you obviously like it or you wouldn't be doing it. Any particular brand of oil, high on tbn :rolleyes:

Nevermind on oil brand, it's right there on the 5 gallon pail :doh:

I'm going to bed now been a long day

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