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AU3 ute diff backlash 

 

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 Post subject: AU3 ute diff backlash
Posted: Mon Aug 04, 2008 11:19 am 
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Hey guys, i got an AU3 ute. And I'm noticing some backlash (i think it's excessive) through the drivetrain. I'm told its the diff and pretty normal in this car.

Has anyone else encountered this prob? Thought i'd ask before i try to fix it...
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Posted: Mon Aug 04, 2008 2:01 pm 
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What exactly is it doing? I had issues with stuff like that and found part of it was due to the one piece alloy tail shaft as well as the diff

 

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Posted: Mon Aug 04, 2008 2:40 pm 
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what exactly is the ute if a auIII pursuit ute then i'd check the centre bearing as the pursuits had a 2 piece tailshaft. Other than that i was told it seems all au - bf falcons come with backlash in diff from factory. There aren't many with no backlash at all.

 

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Posted: Tue Aug 05, 2008 1:25 pm 
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It's a XLS with 4.0L and 5 speed. You can feel it when you change direction (reverse to 1st or vice versa), when you start moving it gives a little clunk. Feels excessive to me, but I've only owned 2 ef sedans and a sigma before this car.
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Posted: Tue Aug 05, 2008 2:07 pm 
Getting Side Ways
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Ride: fg xr6t manual, xe 351 ute

Location: penrith, sydney
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not sure if this is correct (if someone wants to clarify) but in 1st gear constantly jerk the throttle if you hear a clunking sound then its a fair bet your uni's are gone. Having said this BA's and AU's are very similar and mine has about a second or two before it engages reverse (auto) and a clunk is heard. I had it checked out and was told it wasn't anything to worry about as it pretty normal in AU's and BA's. Pretty much ws told to drive it until the diff gives up as its not worth the money you spend repairing it

 

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Current cars
1983 XE Ute - xf front, worked 351, straight gas
2010 Fg xr6t manual - stock

ex cars
80 series cruiser, ba xt, ea s-pac (xr6 test model), ke laser.

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Posted: Tue Aug 19, 2008 1:17 pm 
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I checked the drive shaft and it was fine. I also checked the diff oil, it was low, thin and of a brown colour. After i cleaned the crap out of the housing and the diff centre i replaced the oil with a heavy duty LSD oil and problem solved! No more clunking and the Limo is tight as!!! SWEET!
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Posted: Tue Aug 19, 2008 3:36 pm 
Getting Side Ways
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Age: 32

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Ride: fg xr6t manual, xe 351 ute

Location: penrith, sydney
NSW, Australia

good to hear it all worked out

 

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Current cars
1983 XE Ute - xf front, worked 351, straight gas
2010 Fg xr6t manual - stock

ex cars
80 series cruiser, ba xt, ea s-pac (xr6 test model), ke laser.

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