Help me choose a tranny

[sumran]

I would like to tap into the knowledge on the forum to help me select the best tranny for my project. I have read other threads, but the info I am looking for is scattered across several threads. My project thread is here:

http://67-72chevytrucks.com/vboard/s...d.php?t=446737

It currently has a TH350 and a 250 inline 6. I have secured a 305 motor for the project, which will get a modest build before install. No major horsepower or racing is intended. Just a nice street truck / cruiser. I believe the truck that is supplying the motor also has a TH350, but I have not checked. I was initially planning to have a 4-speed, but have abandoned that idea.

I am considering a swap to a 700R4 to add the overdrive, as I will be using the truck for interstate driving fairly often. I am not sure of the installation pitfalls of this conversion.

Additionally, I would like get some input on the good and bad of both trannys and pointers on what should done to them before install.

Thanks in advance for your input.