What do I need to get the back case of my chain case off??

[Labrador-Ronin]

Hello all, I have the gears, front of the case, chain, tensioner and the driven pulley off, the spedo aswell.
I CANNOT get the back of the case off, what am I missing?
C clips are off the shafts and it still won't pop free.
It's on a 2004 SX Viper, forgot to add that, reason I'm going through this, I think the track is ratcheting, there's thump thump thump noise, no debris in the tunnel, I'm betting bearings and drivers are worn out

 

[s10mike]

Did you remove the brake caliper? If so, I sometimes use a prybar and a bit of muscle to pop the back half off

 

[MURDER YAMAHA]

Parking brake, and brake caliper

 

[Whammy]

Did you check the belt out?? Doesn't take much to do that...……. (chain tensioner)