adjustable transmission crossmember?

[Flanders 46]

So I've just put in a lovely set of Ron Morris adjustable engine mounts so that I can give myself a bit more clearance for my header install.  However, physics tells me that the transmission also needs to move with the engine, so I need to move the transmission mounts over just a touch as well.  I haven't gone out and checked, but is there much play in the stock transmission crossmember for this?  Or am I going to have to bore out the holes a bit?  351W with 4-spd toploader if it makes a difference.

[1969_Mach1 333]

Transmission adjustment, as best I recall, front to back yes, side to side no.

How is all this motor and trans movement going to affect the u-joint operating angles?

[aslanefe 333]

As far as I remember, the cross member is not adjustable but the mount and/or transmission has little adjustment.

[Flanders 46]

I need to move things over by 1/4" so I'm not too concerned about the u-joint operating angle (plus, honestly the car doesn't get driven hard or much).

thanks for the tips, I'll see if I can loosen everything up and see if it will move a bit.

[RPM 1,190]

Are you moving it over for good, or just while installing headers and such? My tranny mount has some clearance side to side. If you move the motor over a quarter inch, you should be able to move the trans 1/8" over, which imo would suffice. 

[Flanders 46]

thanks RPM-- this would be permanent.  And I agree, I think at the transmission it would only be 1/8".  Just gotta get out in my garage again and play around!