71 Duster 360 (new project)

What issues would I encounter if I tried to install with the engine/trans already in the car?

Frustration...anger...alot of cussing...bleeding fingers and knuckles...

I myself would never try to put one of these things on a trans that is already in the car...If you dropped the trans cross member and lower the back of the trans..on a 904 you might get it to slide on......then you have the issue with the long bolts with allen heads on them...