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Old 12-03-2012, 01:52 AM   #1
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Transmission fluid change

I recently changed my transmission fluid roughly 1500miles ago maybe less. I noticed some whining noise when I started up and got a little louder when running. Check on here and read possible cause was low fluid level in transmission. I unbolted fill bolt and it started leaking out like it should if its full. The fluid was black already is that normal for that few miles? And after I bolted back up I have not heard the whining noise yet . Any other possible explanations for noise?

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Old 12-03-2012, 08:06 AM   #2
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I'm not sure on the color being black already; maybe you didn't get all of it out, which would explain the too full.. did you drain/fill on level ground?

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Old 12-03-2012, 08:57 AM   #3
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I had water in it the first time so it was all coming out brownish. I let it sit for like 20 min to completely drain out And yea I filled on level ground.
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Old 12-04-2012, 07:42 AM   #4
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So only idea as to why it turned black so fast is that I possibly didn't get all of it out?
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Old 12-04-2012, 10:51 AM   #5
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If you just dropped the pan you didn't get all of the fluid out. Much of the fluid is in the torque converter and remains there even when you drop the pan.
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Old 12-04-2012, 11:04 AM   #6
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Just bite the bullet and get a T-Tech. Don't skimp on your transmission. It will cost you.
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Old 12-04-2012, 11:59 AM   #7
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Exactly what gear lube did you fill your transmission with? Redline MTL and Royal Purple Synchromax are two good choices for your NV3550 5-speed.
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Old 12-04-2012, 02:13 PM   #8
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So several fluid changes are required to get it all out then? And I took it to the shop when I had my clutch put in. Was told they flushed my trans too however when I got it home and unbolted it. It came rushing out like it was over filled with chocolate milk looking fluid so pretty sure they lied, didn't request that service but wasn't charged either... And I used Lucas 75w-90 all that I was able to get ahold of on short notice since I needed jeep back and running to get to work and school after I sunk it.
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Old 12-04-2012, 02:35 PM   #9
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Lucas 75W-90 was an ok short-term choice but its sulphur-based GL5 formulation makes a bad long-term manual transmission lubricant since its formulatio is harsh on the brass gear synchronizers.

What model year TJ do you have since the right transmission gear lubes vary by model of transmission.
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Old 12-04-2012, 02:51 PM   #10
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I have a 2000 sport TJ. I followed advice and instructions when i performed the fluid change from a thread i read on here however, i don't recall it mentioning changing the filter? for the trans. I just read about that when searching for threads with torque converter in it. The harshness of the gear lube is possible reason why i was hearing a whining noise? it stopped or is quite enough i don't notice it after i unbolted fill bolt the other day to check level. I used Lucas on my diffs as well suggest changing that as well? i can unbolt the fill bolt later and take a picture of the fluid if that will shed any light on what might be problem.
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Old 12-04-2012, 03:46 PM   #11
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Only automatic transmissions have a filter & torque converter. Your manual transmission has neither of those. No need to change the Lucas out of the axles, they are fine with the type of GL5 gear lube you used in them.
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Old 12-04-2012, 04:00 PM   #12
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ok, thanks for clarifying that. i will search around and find some Redline MTL and empty out the Lucas
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Old 12-04-2012, 04:03 PM   #13
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Royal Purple Synchromax will be much easier to find, most auto parts stores seem to carry it. Redline MTL is pretty much mail-order only.
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Old 12-04-2012, 07:22 PM   #14
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ok thanks for the help, ill go and look for it when i get the chance to.
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Old 12-05-2012, 11:09 AM   #15
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Sorry, didn't pick up on the fact that we are talking about a manual trans.

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