I think about 1 in 5 that I see are actually correct!

Yoiu have to know how to understand the BESTBAC codes on the records as well or you'll misinterpret the data, which they normally do. To understand the codes, you need a pretty good undestanding of the vehicles you are looking at. One example that comes to mind is on LJ XU-1, the code for the diff shows open centre 3.36. However all these cars had LSD. The reason it doesn't show up in the coding is the LSD is part of the XU1 special vehicle package, hence not an option - BETSBAC codes are all about mechanical options. Another is the front discs on HJ's. Discs come standard with V8, so the codes show drums for V8 HJ's.