For those of use currently in need of a longer speedo cable for a T56 swap, here are the only known correct part numbers. I say that to say this, D and D Performance advertise's that they "specially made for us" have T56 speedo cable's, price, $70. Here are my known part numbers and length's.
87-93 5.0 T5 Factory Speedometer Cable 71inch
1992 Ford F150 5.0 Speedometer Cable 92inch
Part#'s Y869 $10.96 Rock Auto
03236 $12.71 Rock Auto
These are the known extra long speedo cable's. I bought one from advanced auto, PN# 03175. It is 71 inch. It is the same length as the factory fox cable.
87-93 5.0 T5 Factory Speedometer Cable 71inch
1992 Ford F150 5.0 Speedometer Cable 92inch
Part#'s Y869 $10.96 Rock Auto
03236 $12.71 Rock Auto
These are the known extra long speedo cable's. I bought one from advanced auto, PN# 03175. It is 71 inch. It is the same length as the factory fox cable.