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Unread 07-13-2010, 10:24 AM   #1
Gymguyjeep
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Fluid Change for NV 3550

I changed the transfer case ATF+4 fluid in my transfer case for the first time this past weekend. The fluid looked exactly like the new fluid I put in. There were some very small filings of metal attached to the drain plug, but after 60,000+ miles, the fluid looked surprisingly clean. This has me wondering about changing the syncromesh fluid in the 5 speed tranny. I will need to remove a skid plate to get to the drain plug and wonder if the extra work is worth it. If I drain the fluid without needing it which seemed like the situation with the transfer case, it just looks like a waste of money.

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Unread 07-13-2010, 10:41 AM   #2
Sundowner
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I changed mine not long ago...took about nine minutes to do it, start to finish. I got a lot of powder off the magnet, and the fluid did need changing after 89,000 miles...just because it looks new doesn't mean that it acts new. If you've never changed it, you probably need to do so.

Since you've got a skidplate in the way, it might be worth making some access modifications while you've got it off. You could mark a location and take a hole saw to the plate and make yourself a port for reaching the tranny drain plug; since I'm not familiar with how your plate is set up, I can't say how easy that would be, or whether or not you're blocking access to your fill plug as well. I wouldn't let the old fluid sit in my transmission because of a skid plate, though, were it me...

I refilled with 2+ quarts of Penzoil Syncromesh...a bottle pump makes it wonderfully easy. The new fluid helped a bit to quiet the normal noises of the tranny, as well...might just have been because it was a shade low.
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Unread 07-13-2010, 10:46 AM   #3
HPJeep
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I'd change it but I'm anal about maintainence. I change all of my fluids every 25k miles to keep the mechanicals happy.
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Unread 07-13-2010, 12:09 PM   #4
BDS-Tech
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Quote:
Originally Posted by Sundowner View Post
I refilled with 2+ quarts of Penzoil Syncromesh...a bottle pump makes it wonderfully easy. The new fluid helped a bit to quiet the normal noises of the tranny, as well...might just have been because it was a shade low.
Out of curiosity, did the Penzoil run quiet in yours? I have a 3550 swapped into my '97, out of an 03 Rubicon, and when I first installed it, I ran the Penzoil, and it was really, really noisy. I replaced it with GM synchromesh (same as the Mopar stuff, $3 bucks cheaper a quart) and it quieted right down.
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Unread 07-13-2010, 12:33 PM   #5
newracer
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Preventative maintenance is never a waste of money. I put redline synthetic in my tranny, helped with the slight crunch going into 2nd.
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Unread 07-14-2010, 12:41 AM   #6
Red04X
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I use 30 wt oil as per this info
High Impact - NV3550 5spd

Makes sense since it's just gears in there and oil is better for gears then a ATF
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Unread 07-14-2010, 07:02 AM   #7
Gymguyjeep
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I guess that I will go ahead and change the fluid this weekend. I had already bought some Pensoil Syncromesh for the job a while back. I had always read that you needed to use a Mopar equivilent fluid. That is the first I have seen using regular 30W oil is recommended.
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Unread 07-14-2010, 01:49 PM   #8
sh13lds21
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i changed to royal purple manual transmission fluid and i noticed the tranny did quiet down a little. that was the first time i changed it so i dont know how any other oil works besides the factory stuff
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