SROD transmission noise
The car is a 1982 Mustang GLX 5.0 with the 4 speed SROD transmission. Ever since I got the car it's made a wierd noise that i've never had checked out and it's bothering me.
If I put the trans in first gear and get going up to 3500 rpm or more and then push the clutch pedal in and let off the gas and just coast with the shifter still in first gear, I hear a wierd "whiring" noise. It's not the sound of a broken or chipped gear tooth, it sounds more like a bearing with sand in it. I have to be in a quiet place with the windows down to hear this, and if I pull the shifter into neutral or any other gear besides first, the noise is gone. If I leave the shifter in first and start easing off the clutch (engine breaking), as the clutch engages and the engine begins to slow the car down IN FIRST GEAR ONLY, the transmission makes a high-pitch whining sound, like a horribly worn rear end howl, except much higher in pitch. In order to hear the wierd noise I have to be in first gear with the clutch pedal pushed in and engine idling, coasting at least 20 mph in a quiet place (i.e. my neighborhood at 11pm). Besides that, the transmission works perfectly and no noise can be heard. It shifts through all gears properly and does not do anything funky or make any noises during normal acceleration and shifting. I'm thinking it's a bad bearing maybe and the wierd whining noise when down shifting into first from a decent speed could just be because the gear teeth are worn on the acceleration side in first gear but not the "engine breaking" side since it's hard to get the shifter to go into first above 5 or 10 mph and it's such a short gear that probably no one ever used first for engine breaking, so the teeth don't really have a wear pattern on the back side which causes the whining sound. However I have no experience with manual transmissions so it could be a horribly worn gear set, you tell me! If anyone has heard either of these noises before, please help!
The clutch and throwout bearing are new and the noise only occurs in first gear, so I know for a fact that it's inside the transmission. The engine is stock and the car has either 50,000 miles or 150,000. It could very possibly be only 50,000 judging by it passing emissions as good as only a brand new car should.
Thanks!
|
Linear Mode
