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Old 04-30-2013, 09:48 AM   #1
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Nv3550 1st gear grind

I recently replaced my worn out ax15 with nv3550 i found for a smoking deal. Now I know why. As soon as I Nolte it up, I noticed the shift tower was cracked (great excuse for a b&m shifter!) and what I believe to be a worn out synchro in first gear. When cold and moving at any speed, first will constantly grind. I remember reading something about a kerosene flush with these transmissions, but can't find the thread. Is it possible that doing this and replacing my fluid with redline or royal purple will cure this issue? Or am I looking at a rebuild? The tranny was said to only have 30k on it, but who knows on Craigslist.
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Old 04-30-2013, 11:14 AM   #2
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The redline MTL will likely help some but if the synchro is gone then no fluid or flushing will help.

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Old 04-30-2013, 01:29 PM   #3
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Logan I just did the flush on both of my jeeps ax-15 and NV3550. The ax is going out ( syncro's ) so I did the flush hoping for a miracle, it helped but replacement is in the very near future. The NV 3550 was just shifting hard into 2nd the flush and new RP syncromesh cured it.

1998 4.0 5 speed, Superior super 35 rear, Superior super 30 front, Yukon air lockers x2. 3" Terra Flex suspension lift, 1.25" BL, 1" MML War 8K winch, Dick Cepeck Radial F-C 33/12.5/15.
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Old 04-30-2013, 02:37 PM   #4
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Alright I'll give the flush a try and hope it works. After the tranny warms up, it doesn't grind, so I feel that there is hope in flushing.
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Old 04-30-2013, 10:21 PM   #5
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I know this sounds stupip, but here goes. Ichanged trans fluid to to 15/40 synthetic last winter. It was durring a clutch replacement, from after wheeling in heavy muddy water. The silt in the heavy water not only took out the clutch, but also took out the engine fan clutch. I replaced the trans clutch and the fluid. I noticed that the engine fan ran all the time when driving. No big deal. When cold out i Had to wait to shift. Espesialy when in cold temp. I live in N Indiana also. I noticed that after temp rises the shifting was better. Last weekend I changed the viscouse fan clutch that was running all the time. I found thatEven when cold the trans shifted better and my fuel mileage really increased. I know the trans oil is probably wrong, but the fan clutch not running all the time did help a lot. Thats just my story.
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