I had a subscription to alldata and found it useful. It had a lot of good information about specifications and mechanical tolerances on the car. I have let it expire, but I think I will resubscribe to it.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record