Ive got the build sheet for my 98 sport and theres a ,few codes on there that I need to know about as Im just curious firstly

NMCP Heavy Duty Engine Cooling does,this mean its got a better radiator and cooling fans?

NHBP Auxiliary Transmission Oil Cooler again does that mean I dont need to get an extra tranny oil cooler

now the ones that are puzzling me are

SDBP Heavy Duty Suspension
ZGGP Spring - Left Front
ZGUP Spring - Left Rear
ZVKP Spring - Right Front
ZVVP Spring - Right Rear

whats the codes for the seperate springs mean on the rear springs,any idea on the poundage on them ?

as I'm planning for my lift kit and want to know whats what before I,begin ripping the stock stuff off.

 

All are parts of the (optional) towing pkg. So it should of came with the factory hitch.

 

It came with the fixed hitch that the dealer supplied when it was acoording to the paperwork thatcamewith the XJ,as reciever hitches arent used that much over here in the UK.