Gearbox Chatter

I'm no mechanic but if my car was making noise like that I'd stop driving it immediately. Someone can correct me but noise from the gearbox is never a good thing.

 

I am not a mechanic... but I can tell you, we sell a crap-ton of 360 gearbox syncros and gear sets.

I would advise you stop driving and have a professional look at it.

 

Could possibly be the drive shaft constant velocity joints rattling. This happened to my 360 and was resolved by inspecting and repacking the CV joints.

Good luck

 

The thing is , when we are driving noises seem to come from places that they are not coming from. I had a buzz coming from my 355 I thought it was from the rear of the car between the fire wall and the negine area, it was actually coming from under the dash board and was a simple screw vibratind. Best to take to a mechanic and let them have a listen.

 

Try switching back to the original gear oil you were using first, and see what that does.

 

Have to agree with the others that there's a high risk of more damage with more use when "bad noises" are coming from the gearbox, but I just wanted to pass on that I had the exact same experience in my TR -- tried the Redline 75W90NS, but the LS clutch chatter was terrible; added their friction modifier = no change; went to a different "with additive" gear oil (Royal Purple MAXGEAR) = no chatter. If your noise is only LSD chatter, I'd try a different gear oil before resorting to more significant measures (but only you can gauge/determine if the noise is only LSD chatter) -- JMO.

 

Sounds like diff, not gearbox. You're running a great oil and even added the FM so I'd say you've done the right things. What you are hearing is the differential chattering as it tries to compensate for differing wheel speeds/distance traveled. I wouldn't say you are in any imminent danger. I'd do another oil change and see if the LSD gets happy again. If not, you should have someone look at that differential.


Rick

 

good suggestion, one problem with the 360 F1 is that diff issues can cause the TCU to drop the box into neutral. Most 360's tend to get tail happy and contact a curb or two and depending upon the impact it'll cause trouble with the diff down the line.

I'd get the gearbox looked at by a shop to rule out any other potential issues.

 

Redline says 4% friction-modifier with NS, so keep increasing the dosage little at a time until you get to 4% and see if the chatter stops at some point.

 

You should have the side bearings checked on the ring and pinion spool. It will exhibit a chattering, grinding noise, only on tight turns, most pronounced and audible when you are going at a slow rate of speed, such as tight turns in a parking lot. Over the years, we have probably replace several dozen bearing assemblies on 360's, a common problem.
Gary Bobileff

 

I can only say that my symptom was a loud moaning/groaning when making a sharp turn from a stop.

I believe that that's true from a physical sense, but the noise I was suffering from was so annoying/embarrassing that it was just flat unacceptable IMO.

 

sell immediately......... buy 328

 

When i change the differential oil in my truck it takes 500 to 800 miles or so for the red line friction modifier to work. My differential bucks for a split second while at highway speeds when coming on and off the gas and it makes an awful grinding sound while turning at low speeds (like at drive thru). Somehow the modifier does it's magic eventually.

If this was happening in a 360 that i owned though I'd get it looked into instead of taking the chance of real damage.

 

NS gear oils have no friction modifier since race cars don't care about low speed chatter. The only thing they use friction modifier for is to fine tune lockup. I don't know why you're using NS, but since you've got it and the friction modifier already you might as well give it a shot. 4% is off the Redline site. Just increase in small increments up to 4%. If it's still there at that point, use a different fluid if you think the diff is fine. What were you using before this?

http://www.redlineoil.com/product.aspx?pid=41&pcid=4

Recommended Dosage:
Use 4% for prevention of limited slip chatter in broken-in units (typical one 4 oz. bottle) or 4 to 8% for the break-in of new differentials.

 

I would pull the filter screen in the diff. and check for debris first.

 

+1.

I would stop messing around with the redline and switch back to royal purple or the factory fill or whatever you used prior.......see if there is any difference.
You will either see the difference immediately ......or not.

 

Last spring I changed both inboard boots on my 355 and did not notice any play of any kind.....can't speak for the 360 though.
Hopefully someone else can advise on the 360.

 

I'd be inclined to add slowly. It may take a while to work it's way through the system and take effect and you could find yourself overshooting the mark.

 

Alex, I've only noticed this post of yours now. I'm not sure what way you've measured play but I'd be very surprised if there is supposed to be any play "side to side". You also mentioned that there's much less play on the other side and that is also a clear warning to me that something is not as it should be. I've had a wee look at the WSM and haven't managed to identify any acceptable level of tolerance.

I suspect that you need to have this examined by a professional at this stage.

Best of luck.