As in "chirp chirp chirp"?

If so, you are in the right place, but also suspect a dry drive shaft bearing and or dead tranny mount.

Just for kicks, check any engine shocks you have, too -- they can chirp when the engine mounts go flat.

Peter

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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!