Kind of thinking out loud. '85 k20 Burb w/ 700r4. Am currently doing a 454 swap. This will be a tow vehicle and pack mule. I have read all I can read about the 700r4s and lack of abilities and strength, the 4l80e coversions and built 700r4s. With the cost of a 4l80e and then a controller you can be @ $4k quick. So, I was thinking, why not go to a TH400 with a US Gear Overdrive. Since it's a burb I have plenty of wheelbase, coverting to a 400 should be real easy, strength would be greatly increased, and would still have overdrive. Could do all this for $3k. This would also open my transfercase option up greatly. Thoughts?