Stuart---Others have given you more likely causes of this intermittant cracking
sound, so no need to repeat them. I will offer some less likely possible
causes, only because they're easy to check.
1) Torque up your wheel lugs. If there is no change in the sound after a drive,
switch the wheels, front to back. Grease the front bearings while here, if it
looks like they need it.
2) Take the halfshafts apart and grease their splines.
3) With the rear wheels off the ground, try shaking them from top to bottom.
(Loose hub)?
4) Grease those U-joints that have fittings in them. One at a time, between
test drives. If there's improvement, that's the 'joint that was unhappy and may
soon fail.
Dick
-----Original Message-----
From: Stuart Thompson
Sent: Friday, August 22, 2008 6:52 AM
To: 6 Pack list
Subject: [6pack] Intermittent Cracking Sound
Fellow Listers:
I have been getting an intermittent cracking sound coming from the
rear end of my '74 TR6. The differential was rebuilt a few years ago
when I replaced the U-joints.
When the differential was out I discovered a cracked mounting
bracket (forward right) that was welded back but not reinforced.
Visual inspection shows the welded bracket appears to be
holding together.
What would be the most likely cause of a cracking sound? It does
it sometimes when just backing out of the garage or even turning the
corner at 15 mph.
It does not do it all the time. Last weekend I drove it approx 50 miles
and it only made that sound once or twice.
I am hesitant to venture too far from home until I know what's wrong
or about to give out.
I suppose it could be any number of things. My other 74 TR6 with
higher mileage never made this sound.
Regards,
Stuart
http://www.triumphowners.com/1069
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