AMSOIL's Synthetic Manual Synchromesh Transmission Fluid (MTF). It is recommended for the NV5600. Not knowing what truck you have I checked the 2005 DODGE RAM 2500 with the NV5600 and it requires 9. 5 pints (5 quarts) to fill. It also has a 50,000 to 150,000 Mile drain interval depending on how you drive.
Performance Features:
• Reduces friction, heat and wear
• Superior high temperature stability
• Resists heat, oxidation, acid buildup and varnish
• Improves cold weather shifting
"APPLICATIONS: Recommended for automotive and light truck applications that require synchromesh transmission fluid. Applications include manual transmissions and transaxles such as New Venture NV T350, NV 1500, NV 2550, NV 3500, NV 3550, NV 5600" <--- right from the AMSOIL WEB PAGE. I hope this helps. -Jason