Hello ,can someone help me with some info on 404 Gearboxes ,were there any changes in the gearbox [military trucks]during its time of manufacture[beginning to end ] ?is it the same a the 411 box ? Also is this called the F type ? my truck is a 1962 truck .I wanted to buy some spares for it ,for possible future need and just wanted make sure i get the right parts first up ,my truck is 3 hours away and cant check it for numbers etc on g/box thanks for any info