When you get it up in the air look at the cross mount at the rear of the transmission. At the connection point where the cross mount attatches to the frame look to see if it originally rested on top of the frame or if it was bolted underneath the frame. Age should show an impression on where it was originally before it was worked on.

Things like that is what to look for or just take it to the Steelership and ask them to tell you what was done on the installation that would be the cause of the problem.

Hope This Helps!

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William
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1987 420 SEL - Like a fine wine only better with age