shmkr, You can use the center pumpkin from a 55-58 truck. It will bolt right on to your 46 axel housing taking the place of your torque tube. You will have to weld on new spring perches and find a drive shaft that fits and you are good to go.
Most of the 55-58 pumpkins will have 3.90 gears which work pretty well with a T5. The nice thing about this switch is that you can use your 46 axels and you get to keep your original emergency brake steup.
If you are still using your 46 bell housing you will need an adaptor plate for the T5 and make some other modifications to the cross member. There is some real good information on this switch in the Tech Tips. Be sure to check them out. If you have more questions be sure to post them here.
Good luck
George
