assuming the 465 has a 10 spline output:
you will need a RARE 465-203 adaptor (factory '74 or one of the fabricated replacements ORD, NWF, etc) and a 10 spline FEMALE input gear for your 203 (also hard to come by, NWF used to have them, but not listed anymore) This will allow you to tear down your current case, change the input gear, and bolt it to the back of your 465, keeping same driveshafts. Adaptor $150-300, input gear $?
assuming you have a 32 spline output:
you will need a 465-208 output housing (factory 85? and later), a 32 spline input gear for the 203 (ORD, NWF, used case from a th400) and you will need to tear down your current case, change the input gear, re-drill the face to match adaptor. Will NOT allow you to keep current driveshafts. Adaptor $50-150, Input $135 (new), Driveshafts $200-400
Using a np205:
need adaptor (commonly available: junkyard/classifieds $20-50) need 205 case (commonly available: junkyard/classifieds $50-200), need to modify driveshafts $200-400
if it was me, i would look for a deal on a 205. you can probably get a case and adaptor for under 100 easy, then find a decent driveline shop and pay about 200-ish to have your rear shaft lenghened and your front shaft shortened
