a big klunk

scampdude · 02-12-2008, 09:53 PM

my 1975 dart sport just started to make a big clunk noise when i put into reverse but no noise into drive its stock 318 904 setup the rear end sounds like its making noise and maybee the clunking noise and the rear cover looks leeky i just got it and havent time to check it out lately

440roadrunner · 02-13-2008, 09:13 AM

Most probable causes are a U joint going bad, or "trouble" in the rear end.

To inspect the U joints do NOT just trust wiggling them in place. Remove the driveline, and move the u joints by hand, feeling for roughness in the bearings. Sometimes these can get water inside, rust up, and "feel tight" when in reality the rollers are disintegrating inside.

If it's the rear, could be a number of things, and may not be all that important.

If the rear has had "hard use" you might have damaged something. Does the rear grown or hum or whine at speed? If not, it may be "normal play" from wear.

Try to see if there's bad play on the front drive yoke, and with the car in neutral, rotate the shaft back and forth to see what play is in the ring/pinion.

All "single" rear ends develop some play.

super commando · 02-13-2008, 04:48 PM

could be spider gears
could be u joint.
could be pinion flange runout, does it clunk upon acelleration and deceleration?
ujoint typically will give youy an unbalancing feeling at highway speeds.
or clunk forward and back but not always,
sounds like this diff may have been neglected. entire driveline for that matter.

scampdude · 02-13-2008, 07:08 PM

it only clunks when i shift into reverse not drive, no noise under accel or decel

02-12-2008, 09:53 PM	#1 (permalink)
scampdude Junior Member Join Date: Feb 2008 Posts: 13	a big klunk my 1975 dart sport just started to make a big clunk noise when i put into reverse but no noise into drive its stock 318 904 setup the rear end sounds like its making noise and maybee the clunking noise and the rear cover looks leeky i just got it and havent time to check it out lately

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02-13-2008, 09:13 AM	#2 (permalink)
440roadrunner Senior Member Join Date: Nov 2007 Posts: 272	Most probable causes are a U joint going bad, or "trouble" in the rear end. To inspect the U joints do NOT just trust wiggling them in place. Remove the driveline, and move the u joints by hand, feeling for roughness in the bearings. Sometimes these can get water inside, rust up, and "feel tight" when in reality the rollers are disintegrating inside. If it's the rear, could be a number of things, and may not be all that important. If the rear has had "hard use" you might have damaged something. Does the rear grown or hum or whine at speed? If not, it may be "normal play" from wear. Try to see if there's bad play on the front drive yoke, and with the car in neutral, rotate the shaft back and forth to see what play is in the ring/pinion. All "single" rear ends develop some play.

02-13-2008, 04:48 PM	#3 (permalink)
super commando Junior Member Join Date: Feb 2008 Posts: 2	could be spider gears could be u joint. could be pinion flange runout, does it clunk upon acelleration and deceleration? ujoint typically will give youy an unbalancing feeling at highway speeds. or clunk forward and back but not always, sounds like this diff may have been neglected. entire driveline for that matter.

02-13-2008, 07:08 PM	#4 (permalink)
scampdude Junior Member Join Date: Feb 2008 Posts: 13	it only clunks when i shift into reverse not drive, no noise under accel or decel