Forgot to update on my CB. It still wasn't working so I got some help from the guy I bought it from. After checking pretty much everything else, we figured out the internal speaker doesn't work. He gave me an old external speaker to use and now everything works fine.
Also, today I got most of my RPO codes figured out:
http://www.rpocodes.com/GM-RPO-codes/gmrpocodesAthroughF.html
AE7 - Seat, frt split driver pass easy entry
AJ1 - Window tinted, deep, all except w/s and drs
AM7 - Seat, rr, folding
AU0 - Lock control, remote entry - keyless entry (domestic)
AU3 - Lock control, side dr, elec
A20 - Window, rr quarter vent swing out
A31 - Window, power operated, all doors
B32 - Covering, frt floor mats aux
B33 - Covering, rr floor mats aux
B85 - Ornamentation, extra molding belt reveal
B96 - Molding whl opening
C6P - GVW rating, 8600 lbs/3900 kg
C60 - HVAC system, air conditioner frt man controls
D48 - Mirror o/s, rem cont, elec painted
E63 - Body equipment, fleetside, pubx
FE9 - Certification, emission, federal
GMC - Plant code Pontiac, MI, USA
GT5 - Axle rear, 4.10 ratio (dup with GT8)
G80 - Axle positraction, limited slip
JB7 - Brake, power, disc, drum 8400 L85
KNP - Cooling system trans, HD
K34 - Cruise control, automatic, electronic
K60 - Generator, 100 amp
L31 - Engine, gas, 8 cyl, 5.7l; truck
MT1 - Transmission, 4 spd, auto w/elect controls h.d. (hydra-matic 4l80-E)
NA4 - Emmisions system, GVW, above 8500 lb
NA5 - Emmision system, federal, tier 0
NP5 - Leather wrapped, steering wheel and shift knob
N33 - Steering column, tilt type
P06 - Trim discs, wheel
R9L -
R9R -
SLM - Stock order, processing code
UL0 - Radio am/fm stereo, cass. (europe compliant)
UQ3 - Speaker system, performance enhanced audio
VB3 - Bumper, rr, step, chrome, impact strip
VG3 - Bumper frt, impact strip
VK3 - License plate, frt mounting pkg
VR4 - Trailer hitch, weight distributing platform
VXS - Vehicle complete
V22 - Grill radiator, chrome
V73 - Vehicle statement, USA/Canada
XHH - Tire front, LT245/75R16/E BW R/PE ST TL ALS 120Q
X88 - Conversion name plate chevrolet
YD3 - Front axle, base equipment for scheduling,GVW plate
YD6 - Rear springs, base equipment
YE9 - Convenience package, comfort & decor level #3
YHH - Tire rear, LT245/75R16/E BW R/PE ST TL ALS 120Q
ZHH -
ZQ3 - Sales package, driver convenience II
ZY1 - Color combination, solid
Z82 - Trailer provisions, special equipment, H.O.
1SB - Option package 02
1SZ -
50U - Primary color, exterior blue white (91)
6XA -
7XA -
79D - Trim combination, cloth, ruby red (D) (93)
791 -