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Well I run this setup & 6.2 L TH 400 Np203 NP 205 t case my truck runs just fine with this setup your 4.56 gear set will act like you have an set of 3.07 the M1009 has 3.08 in it the tires are not much differnt in rev per mile. In stead 55 mph & rpm through the roof rpm 1800 or so APROX. I...

The NP203 is used for only an range box in between Th 400 NP 205 the gear set in range box is revers around to make an DR & OD system An good Tshop can do mods. or google it.

NP203 has to be in gear when starting out :driver:for hwy. this system is like have two speed rears.:beer:

Hi the 203 is gear set is reversed & it is now an over drive unit this is also used in quad plexing transmission in semis rigs I had 1 W900b KW & fliped the ladt two gears and wow la OD was in works an good transmission shop or old timer that builds them will be the man for the job. All it call...

Hi the 4l80e can be installed right to the T case the rear trans out put shaft eill half to be pulled out and install shaft that stick out 4.500 in out the rear of the trans where it bolts to the trans for the np205 to work the 4L80E is aprox 1.750 in longer than TH400 trans 32 splin out put...