If you had the skills to mate the o/d and the fully synchronized tranny that would be awesome, but I never had that much trouble driving around without synchronized first. However I had 4.11's, so I left in second most of the time. The 3.55's may change that. 3-on-the-tree with o/d is/was GM's best tranny setup.

I have the schematics somewhere for the o/d wiring harness if you need them.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."