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Old 12-13-2016, 08:30 PM
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Mixing differential, transmission, and transfer case fluids

Is it ok to mix residual amounts of one fluid type with another using the same bottle pump between gear oil, MTL, and ATF? or should I clean with Dawn between fluids?

Redline 75w90, MTL, and C+ATF are the fluids.

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Old 12-13-2016, 10:24 PM   #2
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Well, I wouldnt want the pump to be full of fluid, but a little residual wont hurt anything.

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Old 12-14-2016, 08:15 AM   #3
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I would recommend a pump for each type of fluid. Then when your done, clean them, label them, and throw them in a big ziplock bag for next time.
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Old 12-14-2016, 08:19 AM   #4
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Is it ok to mix residual amounts of one fluid type with another using the same bottle pump between gear oil, MTL, and ATF? or should I clean with Dawn between fluids?

Redline 75w90, MTL, and C+ATF are the fluids.
If you don't have a pump for each fluid, then the next best thing would be to pump fresh fluid through it into a waste container to flush it out and then use it. It doesn't take much to do it if you start with a pump that's close to being empty.
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Old 12-14-2016, 09:17 PM   #5
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Just did the transmission and transfer case. Drain the pump good, then pump a few times with the new fluid of choice, you'll be good to go.
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Old 12-15-2016, 12:15 PM   #6
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If you don't have a pump for each fluid, then the next best thing would be to pump fresh fluid through it into a waste container to flush it out and then use it. It doesn't take much to do it if you start with a pump that's close to being empty.
Thats what I do. First 2 pumps goes into the waste jug. Never know if a bug crawled up into the tube
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Old 12-15-2016, 01:14 PM   #7
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Just do it in the proper order, first ATF, then MTL and last diff.
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Old 12-17-2016, 09:28 AM
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Just do it in the proper order, first ATF, then MTL and last diff.
Can you clarify this Terry? I didn't know there was an order to follow when replacing fluids.
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Old 12-17-2016, 12:10 PM   #9
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What I meant is that a tiny bit of ATF won't here the tranny, a tiny bit of MTL won't hurt the diff. On the other hand diff oil in the transfer case is probably not a good idea. Most of the hand pumps out there will self drain in just a few minutes so by doing it in this order whatever residue is left won't hurt a thing. At least this is my thinking and how I did it.
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Old 12-17-2016, 02:51 PM
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Ahh gotcha, because GL-5 differential is bad for bronze bushings in the t-case. Thanks man, wouldn't have crossed my mind until too late.
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Old 12-19-2016, 02:41 PM   #11
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would just like to take a second and state; if you have a manual transmission (NSG370) and you have never checked the fluid.. RIGHT NOW would be a great time. Mine was grossly underfilled from the factory/vendor and the dealership didn't care to check upon arrival. Less than a quart drained out... like half a quart.. two quarts it takes.
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Old 12-20-2016, 09:12 PM
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would just like to take a second and state; if you have a manual transmission (NSG370) and you have never checked the fluid.. RIGHT NOW would be a great time. Mine was grossly underfilled from the factory/vendor and the dealership didn't care to check upon arrival. Less than a quart drained out... like half a quart.. two quarts it takes.
My front diff was under filled - only half a quart dribbled out, so I'll see what's in store for me when I do the transmission and transfer case this Friday. If it wasn't for all the posts on this forum about over/under filled fluids I probably would've never looked.

If you want something done right do it yourself.

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