Wedge a small block of wood between the drive plate and the housing where it bolts to the torque converter. This will stop the motor from turning.

Now get a long (6-8 foot) pipe to extend that cheater bar.

I had to put an 8 foot antenna mast over a 3/4" breaker bar with a block of wood between the piston and frame of my Harley to break loose the bolt on the compensation sprocket. I had someone sit on the back of the bike because it was lifting off the ground. That bolt was spec'ed at 325 ft-lbs.

Good luck.

__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)