Does any of my AF peeps know how many volumes of CDC’s the Vehicle Maintenance career field (2T3X1) have?

I believe it is 8 volumes for “general”, don’t know about the shreds

3 tests but it depends on the specific AFSC, -351, -351A (Fire Truck and Refueling), or -351C (MHE). All 3 complete 3 volumes each in CDC set 2T351N and 2T351O sets, testing after completion of each. There is a 3rd set but that's specific to the AFSC. A-shreds did have a volume recently added but not yet noted in the CFETP.
Check out e-pubs, search 2T3X1, and look at page 13. It has a breakout chart of the required CDC sets.
Hope this helps.

http://static.e-publishing.af.mil/production/1/af_a4/publication/cfetp2t3x1c1/cfetp2t3x1c1.pdf