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2012 Ford SVT Raptor Forum (Reply Only)
Deiveshaft/rear end clunk
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<blockquote data-quote="X_TACOMA_GUY" data-source="post: 181988" data-attributes="member: 4979"><p>The clunk is most likely in the rear axle. There has to be a certain amount of backlash in the ring and pinion gears. Backlash is a specified amount of "slop" between the gears as they mesh. If your truck is parked at a slight rearward incline, the ring and pinion are holding the weight of the truck on one side of the gears teeth. Same goes when going in reverse. The shift to drive puts the load on the other side of the gear teeth. This sudden change of load direction actually causes the gears teeth to bang into each other, causing a clunking noise.</p><p></p><p>Try this: </p><p>Set your parking brake, and put the truck into neutral. Then crawl under the rear of the truck, and grab hold of the driveshaft. You should be able to turn the driveshaft by hand back and fourth a little bit.</p><p> Its because of the backlash in the ring and pinion that you can do this. If there were no backlash, the gears would eat themselves when the differential gets warm, and parts begin to expand.</p><p></p><p>I hope you guys find this helpful.</p></blockquote><p></p>
[QUOTE="X_TACOMA_GUY, post: 181988, member: 4979"] The clunk is most likely in the rear axle. There has to be a certain amount of backlash in the ring and pinion gears. Backlash is a specified amount of "slop" between the gears as they mesh. If your truck is parked at a slight rearward incline, the ring and pinion are holding the weight of the truck on one side of the gears teeth. Same goes when going in reverse. The shift to drive puts the load on the other side of the gear teeth. This sudden change of load direction actually causes the gears teeth to bang into each other, causing a clunking noise. Try this: Set your parking brake, and put the truck into neutral. Then crawl under the rear of the truck, and grab hold of the driveshaft. You should be able to turn the driveshaft by hand back and fourth a little bit. Its because of the backlash in the ring and pinion that you can do this. If there were no backlash, the gears would eat themselves when the differential gets warm, and parts begin to expand. I hope you guys find this helpful. [/QUOTE]
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2012 Ford SVT Raptor Forum (Reply Only)
Deiveshaft/rear end clunk
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