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  #1  
Old 10-18-2008, 04:46 PM
Ran when parked.
 
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Locked up differential?

I switched my 1984 300D over to winter tires this morning- all went smoothly until I was done and tried to back up and the car stopped. It was like putting it into "park." I put it in drive and it also locked up but not as abruptly. I jacked the rear end up, tried turning the wheels by hand and the same happens on both wheels.

I've ruled out the e-brake because the wheels do turn a little (maybe a quarter to half a turn) before locking up, I guess if it was the e-brake they wouldn't turn at all.

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Last edited by alfa 75; 10-18-2008 at 04:54 PM.
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  #2  
Old 10-18-2008, 04:49 PM
ForcedInduction
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Take a look at your axles and driveline for anything odd. Differentials don't just suddenly decide to lock up, especially when mounting tires.
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  #3  
Old 10-18-2008, 05:02 PM
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Changed tires and now they don't turn? Did you use the proper lug bolts?
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  #4  
Old 10-18-2008, 05:07 PM
Ran when parked.
 
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Nothing looks awry in the driveline but I do hear a small clunk from the wheel end of the passenger's side half shaft before it locks up.

Yes, lug bolts are the same ones that were on it before, those aren't the issue.
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  #5  
Old 10-18-2008, 05:10 PM
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Are your new tires mounted on steel wheels? The aluminum wheels use much longer lug bolts and will lock up the rear wheels if used with the wrong type of wheel.
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  #6  
Old 10-18-2008, 05:14 PM
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Ohhhh.. yes, they are steelies, that could be a problem. I'm going to swap them now and see.
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  #7  
Old 10-18-2008, 05:28 PM
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I screwed up my parking brake once when I had to put my spare on at the side of the road. I didn't realize that the bolts were too long and I tried to drive away and mangled the assembly.
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  #8  
Old 10-18-2008, 06:06 PM
Ran when parked.
 
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So the problem was the lugnuts, I used the lugnuts from the Bundts on the steelies.

Thanks a lot, this forum never ceases to amaze me (in a good way) and these cars never cease to amaze me either (not necessarily in a good way.) Anyone care to explain why lugnuts make a difference? I've never run into this problem with other cars.
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  #9  
Old 10-18-2008, 07:18 PM
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Alloy wheels are thicker in the portion where the lugs go. Thus you need shorter bolts for the steel rims.

You would run into this problem when changing between alloy and steel wheels on any car that uses lug bolts. Most cars use lug studs and nuts, so this isn't an issue.
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  #10  
Old 10-19-2008, 01:51 PM
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And the aluminum wheels are thicker because aluminum is not as strong per cubic inch as steel.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #11  
Old 10-19-2008, 02:00 PM
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So if you have bundt wheels and a steel spare you had better get some steel type lugs to keep in the trunk!

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1986 560SL - Wife's red speed machine
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