Calling all transmission experts NV3550 -
LinkBack Thread Tools
post #1 of 7 Old 09-29-2015, 07:55 AM Thread Starter
Registered User
1997 TJ Wrangler 
Join Date: Sep 2015
Location: Rochester
Posts: 1
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!

scottpollack is offline  
Sponsored Links
post #2 of 7 Old 09-29-2015, 09:39 AM
Registered User
rondak46's Avatar
2000 TJ Wrangler 
Join Date: Feb 2009
Location: Albany, NY
Posts: 1,797
You have to use synchromesh, synchromax or compatible fluid. I use Royal purple.
rondak46 is offline  
post #3 of 7 Old 09-29-2015, 09:52 AM
Distubed Jeepaholic
TheBoogieman's Avatar
2003 TJ Wrangler 
Join Date: Aug 2006
Location: charlottesHELL
Posts: 40,660
Originally Posted by rondak46 View Post
i use royal purple.
x 2.

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.
TheBoogieman is offline  
post #4 of 7 Old 09-29-2015, 10:24 AM
Registered User
J03_TJ's Avatar
2003 TJ Wrangler 
Join Date: Jul 2009
Location: Reno
Posts: 4,087
Originally Posted by rondak46
... I use royal purple.
J03_TJ is offline  
post #5 of 7 Old 09-29-2015, 11:16 AM
Web Wheeler
2002 TJ Wrangler 
Join Date: Jun 2007
Location: Denton County, TX
Posts: 9,672
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.

denton county, tx
2jhanna is offline  
post #6 of 7 Old 09-29-2015, 05:26 PM
Registered User
2000 TJ Wrangler 
Join Date: Jul 2009
Location: San Diego
Posts: 62
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.
rays00tj is offline  
post #7 of 7 Old 09-29-2015, 05:54 PM
Registered User
2002 TJ Wrangler 
Join Date: Jul 2010
Location: Apple Valley,Ca
Posts: 3,265
Originally Posted by J03_TJ View Post
chris142 is offline  

noise , nv3550

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome