I'll be hooking my powerglide up, looking to add 3:73 gears too.

any ideas on approximate rpm's running at 65? or 70

oh may help, I believe the tranny is 1:90

Depends on your tire size too, but my 3.73's put me at about 3300rpms at 65.

Morning Johnny O! thanks, right now I'm running 225 60's x 14. Probably will stay with those but i do have a couple of 15x 10" chrome rallye's (just in case)