Calling all transmission experts NV3550 - JeepForum.com
 
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post #1 of 7 Old 09-29-2015, 07:55 AM Thread Starter
scottpollack
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1997 TJ Wrangler 
 
Join Date: Sep 2015
Location: Rochester
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Calling all transmission experts NV3550

Yes I have NV3550 noise, but its not your typical one.... Here are the details...

Ok, 5th in my AX-15 went south so I decided to buy a NV3550 with 60k miles on it to replace it with. Added a Hurst short throw shifter and threw away the stock xfer case linkage.

I used Redline MT for the transmission. I run 33x12.50s, drive it like I stole it so I went with the 90 instead of the MTL. Shifts great no chatter, vibrations nothing.

EXCEPT what sounds like a spinning bearing sound. Here's the specifics:
1) Only heard at above 15 mph
2) Wheel speed origin
3) Clutch in/clutch out, in gear/out of gear
4) 2 wheel drive or 4 hi
5) all fluids in tranny, xfer case, both diffs at proper levels
6) "tinkered" with 4x4 shifter to ensure there wasn't a linkage adjustment with new linkage
7) Ujoints (all 4) are all tight and solid, no slop
8) brand new clutch, pressure plate, throwout bearing
9) brand new pilot bearing

I have read across the forums that the NV3550 is known for a "marble in a paintcan" sound. This sounds literally like a bear race popped off and is running on a shaft somewhere. It doesn't seem to change speed when I go faster, but COULD be at that point the wind becomes a factor on hearing.

If I am coming down my neighborhood street you can hear it on the sidewalk so I wouldn't say its "quiet".

I did not change the input shaft bearing on the transmission....didn't think @ 60k miles it would really be necessary. Is it possible that is what it is, or do I have a dorked up ujoint or WHAT, or did I develop a failing wheel bearing

Please help!

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post #2 of 7 Old 09-29-2015, 09:39 AM
rondak46
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You have to use synchromesh, synchromax or compatible fluid. I use Royal purple.
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post #3 of 7 Old 09-29-2015, 09:52 AM
TheBoogieman
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Quote:
Originally Posted by rondak46 View Post
i use royal purple.
x 2.

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
GOT IT BACK 6/17. 03' Rubicon/Zone 4.25" combo lift with 4" lift coils up front/Zone hydro shocks/5.13 gears/35" Mickey Thompson MTZ P3 tires/Black Magic brakes. Jeep #17 & 19.
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post #4 of 7 Old 09-29-2015, 10:24 AM
J03_TJ
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Quote:
Originally Posted by rondak46
... I use royal purple.
x3
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post #5 of 7 Old 09-29-2015, 11:16 AM
2jhanna
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2002 TJ Wrangler 
 
Join Date: Jun 2007
Location: Denton County, TX
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RedLines MTL mets synchromesh specs, their MT90 does not.

I don't know enough to know whether your problem is fluid related or not, but if you have been using MT90, that doesn't meet the spec.

I am multi-talented, I can talk and piss you off at the same time.

jhanna
denton county, tx
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post #6 of 7 Old 09-29-2015, 05:26 PM
rays00tj
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When I purchased my TJ in 2000 I called Redline and asked what they recommended for the NV3550. I was told a 50/50 mix of MT90 and MTL. I ran that in the transmission for the first 10,000 miles with a nice shifting transmission so I don't think running MT90 is going to cause the problem he is experiencing. I would think the 1-2 shift might be stiff until the transmission warmed up. I am running Pennzoil Syncromesh currently because it was easy to get when I was on a wheeling trip. I have run Redline MTL for a few thousand miles without any problem. I always change the fluid when I submerge the transmission in deep water so I have used a few different fluids, all have worked fine.
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post #7 of 7 Old 09-29-2015, 05:54 PM
chris142
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x3
x4
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