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Skippy

az supporter
Joined: Sat Apr 14, 2012 9:57 am Posts: 531 Location: Gold Coast
Vehicle: 2011 Jimny
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 Posted: Thu Dec 19, 2013 10:28 pm |
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I've had a clunk for as long as i can remember, when i drop the clutch and even sometimes when i let it out slowly and accelerate. sounds mid to rear of the car.
Any idea's? thought it may be something to do with the transfer case (reduction gears), rear driveshaft, rear diff and just thought of the front driveshaft, front shaft sits very very close to a tubular chassis cross member.
Last edited by Skippy on Thu Dec 19, 2013 11:49 pm, edited 1 time in total.
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rockcrawlerdude
Joined: Thu Apr 05, 2012 7:30 pm Posts: 298
Vehicle: 1985 LWB sierra
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 Posted: Thu Dec 19, 2013 11:05 pm |
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I got a sound like that in my rear diff, sounds like an auto locker when taking off.
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alien
Joined: Wed Mar 24, 2010 10:30 pm Posts: 16343 Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.
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 Posted: Fri Dec 20, 2013 8:00 am |
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it could be anything down the line... cracked transfer mount, worn uni joint, worn diff center, twisted axle/s...
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Skippy

az supporter
Joined: Sat Apr 14, 2012 9:57 am Posts: 531 Location: Gold Coast
Vehicle: 2011 Jimny
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 Posted: Fri Dec 20, 2013 9:36 am |
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Great.... Cars only done 45000km's. I know it's not the the transfer mounts because I had that all apart a couple of weeks ago. I'm putting it down to play in the rear driveshaft, when you try to twist it by hand it moves a little.
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droverdave
Joined: Wed Dec 19, 2012 7:43 am Posts: 685
Vehicle: 85 ' Drover
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 Posted: Fri Dec 20, 2013 10:37 am |
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If that is the case it should make that noise if you pump the accelerator while driving. ie getting on and off the power in quickish succession.
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foolishme83
Joined: Wed Oct 16, 2013 1:09 pm Posts: 45
Vehicle: 1985 SJ51T
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 Posted: Fri Dec 20, 2013 5:29 pm |
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Check all your unis. I had the same issue and it turned out to be some worn uni's. Also the slip joint on the tail shaft can wear. I would actually take the prop shaft out and inspect the uni's.
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Skippy

az supporter
Joined: Sat Apr 14, 2012 9:57 am Posts: 531 Location: Gold Coast
Vehicle: 2011 Jimny
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 Posted: Fri Dec 20, 2013 7:32 pm |
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droverdave wrote: If that is the case it should make that noise if you pump the accelerator while driving. ie getting on and off the power in quickish succession. Yea does this at slower speeds, well its noticeably then, cant hear it when going say 60km + foolishme83 wrote: Check all your unis. I had the same issue and it turned out to be some worn uni's. Also the slip joint on the tail shaft can wear. I would actually take the prop shaft out and inspect the uni's. From just visually looking at the rear shaft there isn't anything noticeable, i was concerned that with lifting the car your recommended to use a spacer in the front shaft and not the rear 
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Daves4wd

az supporter
Joined: Fri Aug 26, 2011 3:17 pm Posts: 1286 Location: Melbourne
Vehicle: Swb Sierra twin lock 32s 6.5s
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 Posted: Sat Dec 21, 2013 8:08 am |
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Mine did this turned out to be a munted uni....
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alien
Joined: Wed Mar 24, 2010 10:30 pm Posts: 16343 Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.
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 Posted: Sun Dec 22, 2013 6:16 pm |
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the last time i had a clunk like this it was twisted rear axles (they were the original ones from 1992 so they did well to last till 2012 with my abuse!) - the twisted splines were creating more play than normal which was noticeable when grabbing and turning the driveshaft with the car parked in gear. I was lucky to get mine out when i did too, as they were twisted by about the amount of 1 spline or so and had hairline cracks forming, so it wouldn't have been far off breaking completely.
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SierraDan

az supporter
Joined: Fri Feb 04, 2011 10:55 pm Posts: 9347 Location: Newcastle
Vehicle: G13BB Jimny
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 Posted: Mon Dec 23, 2013 12:12 pm |
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I've had opposite results from twisted splines ^ They end up being tighter than normal.
_________________ mlm
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alien
Joined: Wed Mar 24, 2010 10:30 pm Posts: 16343 Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.
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 Posted: Mon Dec 23, 2013 12:46 pm |
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huh, weird - maybe its loose to a certain point then starts binding up again as it twists more? (or vice versa)
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SierraDan

az supporter
Joined: Fri Feb 04, 2011 10:55 pm Posts: 9347 Location: Newcastle
Vehicle: G13BB Jimny
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 Posted: Mon Dec 23, 2013 7:11 pm |
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Riiight.
_________________ mlm
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Abouwer123
Joined: Sat Nov 02, 2013 7:04 pm Posts: 33
Vehicle: 92 Sierra hardtop
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 Posted: Thu Dec 26, 2013 2:05 pm |
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Mine did the whole cluck thing when releaseasing the clutch, turns out my leaf packs were loose haha :p
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