I have a ZF 5DS-25 Type 2 for sale that is straight out of 6 GTD (my GT40). It has been flipped for GT40 use and comes complete with the GT40 top mounting plate and 6 bolt CV stub axles. The final drive ratio is 4.22.
The box works great with no issues at all and is in very good condition. These boxes are very rare and will only go up in value. it will drop straight into a GT40 or replica with no problem.