Crawl ratio

[mousee]

Don't go auto and be like all the non drivers out there. I am sure I will get a lot of hate mail for that, but that is my opinion. The sm465 is a stout tranny and will live behind just about anything you throw at it. If you wanted to click off a few more crawl points, go with the sm420. That would drop you down to 83.4-1. Pretty close to that mystical/magical 90-1. With the wide ratio trannies like the old muncies, you get a lot of options on gearing. The 420 has a 7 first, something like a 3.5-1 second and 1.7 third, lots of options. I have been running the 420 for a few years now with a final drive of 68.something and am always wishing I could go deeper, but keep my existing set of gears, thats why I am working on a crawl box/adapter...
If I was doing your rig to run, I would run the 420 with the 203/205 doubler and call it good, that would give you 126.5-1 and a whole crap load of options...

just my thaughts...