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Re: See my other post
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Posted by CMyles [Email] (#1126) [Profile/Gallery] (more from CMyles) on Thu, 3 Aug 2006 12:44:51 Share Post by Email
In Reply to: Re: See my other post, Todd [Profile/Gallery] , Thu, 3 Aug 2006 11:21:51
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Todd,
Absolutely man. Anytime the spatial or angular relationship between the ring and pinion gears in the final drive change you'll get noise. The whole process of shimming a new final drive set-up is mostly to limit noise. When the pinion shaft can move radially (think "flap") due to loose bearings then that gear to gear relationship changes. When accelerating (drive) the torque from the engine flaps the pinion shaft one way against the resistance of the road wheels and while coasting (coast) the torque from the tires on the pavement flaps it the other way (engine braking). That's why you get different final drive noise depending on drive or coast. The gears are kissing differently. Either way it generally means that your pinion bearings are shot and the long pinion shaft is "flapping". Other possibilities are bad differential side bearings and pretty much any other bearing in the transaxle. The cluster shaft rolls in a caged needle bearing at each end and when one or both crap out then the cluster shaft can flap and cause noise that changes depending on how it's loaded (drive versus coast). Because of the years and mileage on most of these units now I tend to replace every bearing in them when I do rebuild. Years ago we could usually get by with just doing the pinion bearings but I wouldn't advise that in 2006. Upper chainwheel bearings are (were) rarely replaced on rebuilding but I've seen some really bad ones lately and they had to be making noise. Slack primary chains can rub on the inside of the case, again differently on load than coast. Be sure that this isn't a wheel bearing, brake or something simple like that before you pull the unit out. The good news is that new bearings in a noisy transaxle will usually quiet it right down, that is, the gears don't seem to suffer noticably if the unit is fixed right away. Cheers.

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