gear noise?

[USMC1966]

My gears make noise when I decelerate. It doesn't do it if I put it in neutral. Could my pinion angle be off? I have a narrowed 9" with 3.50 gears

 

[6Stang7]

So when you decelerate you hear gear whine? If you put it in neutral and you don't hear the noise, then I would say that it is from the transmission and not the diff. What kind of tranny do you have?

-Shaun

 

[Max Power]

I would disagree. The reason you here whine at coast in gear vs out of gear is because you are using the drivetrain for braking. Putting it in nuetral removes that force and it wont make noise anymore.

I would check diff fluid first. Not sure how yuour pinion angle would change, so I don't thibnk it is that. Probably it's the adjustment to the gears themselves. That would require dissassembly and setting up the rear to factory specs.

 

[USMC1966]

I checked the fluid, it's full. I guess I'll take it out, and put in a open for now I just moved here so I don't have a clue where to get my gears adjusted. Any one know where to take them near Jacksonville, NC?

 

[glennv]

Guy, I hope you have better luck than I have with my gear problems. I'll say a prayer for you tonight. I had a shop regear my 2002 Jeep Wrangler to 4.56. The rear did the same thing your's does now. Whine on the coast. I had the rear rebuilt again and it still does it. My Driveline is perfect and the wear pattern is dead on. You may want to check the pinion preload if they were set up recently. naturally mine is fine and I'm just screwed. It doesn't whine bad but I'm a nut when it comes to my cars. It's only got 17k on it so I can't see living with the noise for any long amount of time. I guess I'll eventually try new gears again but another brand. Both sets were Precision. I'll do Spicer next time around. Sucks doing things three times. Good luck.

 

[USMC1966]

Yeah it bugs the crap out of me! It never did it before then I broke my engine and the car sat for a couple of weeks then on a boat to move from Hawaii to NC . I just got my house so I'm back in the garage again. Thanks for the info.

 

[mhjo]

Mine used to whine all the time, and had pinion and ring changed and adjusted by different specialists three times without any improvement. I was fed up, and had used lots of money without result.

One day I had enough. I took the Haynes manual and studied the whole rear axle setup, and bought a lot of different shims (10).

I drained the fluid into a pan, and opened the rear from underneath. I then tried a smaller shim, reassembled the axle, and took the car for a test drive. This I did 12 times (it took 8 h) and took notes. Finally I found a shim that made the rear 98% silent both on acceleration and deacceleration. Finally.

This method is not "by the book", but "by ear". But hell, it worked for me...

 

[glennv]

Mine used to whine all the time, and had pinion and ring changed and adjusted by different specialists three times without any improvement. I was fed up, and had used lots of money without result.

One day I had enough. I took the Haynes manual and studied the whole rear axle setup, and bought a lot of different shims (10).

I drained the fluid into a pan, and opened the rear from underneath. I then tried a smaller shim, reassembled the axle, and took the car for a test drive. This I did 12 times (it took 8 h) and took notes. Finally I found a shim that made the rear 98% silent both on acceleration and deacceleration. Finally.

This method is not "by the book", but "by ear". But hell, it worked for me...

Yeah, this all gets old real fast. Gears are more of an art than a science. The guy who set mine got the install dead on but I still got a little whine, but I have 4.56 so some of the whine I'm sure is just because of the low low ration. I love having work done three times.