Replace both, from the cat on back.

You will be astonished at how quiet it is then!

The reason it fell off is that the insides are rusted away on both mufflers.

Do check, though -- the factory one is welded on, replacements are clamp-on, and if rear muffler is rotten BUT the pipe is OK, you can cut what remains of the pipe off the front muffler outlet and just install a new rear.

Don't bother to try to weld it, it's rusted away inside, and you would just be chasing holes....

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!