well here's what i got:

P0410-secondary air injection system
P0463-fuel level sensor high voltage
C225-left front sensor circuit open
C226-left front speed sensor missing
C0327-encoder circuit

im pretty sure i know what the deal is with the smog pump and fuel sensor/sending unit. but i dont know what the C225/226 and the C0327 are. i just had the front hubs replaced which have the abs sensor built in.
as for the encoder circuit, does that mean the encoder motor or the tccm? sometimes when the selector switch 2hi light is on and the service 4wd light is off, i can here the tccm do its thing and it takes it a little longer than normal to kick in (t-case). as for 4lo, it wont even go into gear. the t-case makes a clunking sound and slips into neutral. then i shut the truck off, count to five, turn it back on and it goes into 4hi. and sometimes the 2hi light is on and the service 4 hi light is on. even worse is when the selector switch led's arent lit and the service 4 wd light is on. if anyone has any ideas, the help would be much appreciated.

also, how hard is it to change the output axle seals (on the front differential)?

 

The C0225/C0226 are likely due to a cut speed sensor wire on the left front.

C0327 - Encoder Circuit

 

thanks.