[leftybass209]

Here is the low down on overdrive automatics-

The 200r4, and the 700r4 family (4l60e and 4l80e) are great transmissions, but all of them have benefits and drawbacks to an installation.

The 2004r has a higher 1st gear ratio that makes it more manageable with a wider selection of gear ratio's. The 700r4 has a 3.06 1st gear. It makes it great with 3.42's and 3.73's, but 4.11's and lower really test your ability to control the traction and may be too low for daily use.

You can't expect a transmission shop to know the particulars about a specific installation in your vehicle. You know because you studied it, but if I asked you about the specifics of dropping a Chevy inline 6 mated to a 700r4 into a Studebaker, you may need to look some stuff up to make sure as well, especially when you charge and warranty your work to a stranger.