Its a gear splitter, gives you like an in-between gear (1st, 1st-over, 2nd, 2nd-over...) Mounts between the transmission and differential. It helps the rpms from falling so much when pulling. I'm not sure if US Gear makes them anymore....I know Gear Vendor does...you can pick one up for $3k IIRC. If you do a lot of heavy towing it would be handy to have. I don't know what kind of power output they are rated too though. I think I've seen some 500hp trucks with Gear Vendors unit in Diesel Power.
My rebuild with some upgrades was $2100.
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01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
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