Converting oven recipe to slow cooker
Roughly speaking, the low setting on a crock pot is 200 degrees Farenheit, and the high setting is 300 degrees. 

Crock pot time vs oven time:


4-6 hrs on low = 15-30 min oven
6-8 hrs on low = 35-45 min oven
8-18 hrs on low = 1-3 hrs in oven


In addition to the liquid notes above, you may want to make these changes as well:


reduce the amount of whole/leaf herbs by half
add ground spices during the last 30 min of cook time
you may prefer to brown meat before cooking in the crock pot; it's a flavor &amp; fat issue
add rice or noodles in the last two hours of low cook time