What to do, My new 88 crewcab dually c30 toy 1st time on my own

[Xcaliburpcs]

Well I found out it was not a diesel it was a 454, and some rpo codes still missing some
A01 : WINDOW, TINTED, ALL SHADED, W/S
A52 : SEAT, FRT BENCH
C60 : HVAC SYSTEM, AIR CONDITIONER FRT MAN CONTROLS
C7A : GVW RATING, 10000 LBS
DF2 : MIRROR O/S, CAMPER TYPE, SST
D1X : GEAR, SPEEDO DRIVEN
E2E :
E6C : COUNTRY GAMBIA
E63 : BODY EQUIPMENT, FLEETSIDE, PUBX
E8A : COVER, RR COMPT TONNEAU, RR COMPT - DELETE
F58 : STASILIZER SHAFT FR, HD
F61 : STABILIZER SHAFT,RR
GT5 : AXLE REAR, 4.10 RATIO
G60 : SPRING REAR, AUXILIARY
JAN : Plant Code Janesville, WI, USA
JB8 : 8RAKE, POWER, DISC, DRUM 10000 LBS
KC4 : COOLING SYSTEM, ENG OIL
K19 : REACTOR SYSTEM, AIR INJECTION
K22 : GENERATOR, 94 AMP
L19 : ENGINE, GAS, 8 CYL, 7.4L, 1TBI, VB
MX1 : MERCHANDISED, TRANS, AUTO PROVISIONS
M40 : TRANSMISSION, AUTO 3 SPD, TORQUE CONV VAR 1
NA5 : EMISSION SYSTEM, FEDERAL, TIER O
NL2 : FUEL TANK, AUXILIARY
P10 : CARRIER SPARE WHEEL
R05 : WHEEL DUAL RR
SLL : SLL SALES PROCESSING SOLD ORDERS
UA1 : BATTERY, HEAVY DUTY
UN9 : RADIO, SUPPRESSION EQUIPMENT
UP7 : RADIO PROVISIONS, FOR MONO INSTRUMENTATION
UY1 : WIRING PROVISIONS , CAMPER
U01 : LAMP, FIVE, ROOF MARKER, TRUCK
U63 : RADIO, AM, MTR
U73 : ANTENNA, FIXED, RADIO
V02 : RADIATOR, HEAVY DUTY, WITH TRANS OIL COOLER
V43 : BUMPER RR, STEP, PAINTED
V73 : ANTENNA, FIXED
XPF :
Y07 : RING GEAR, 9.50 IN., DANA (S.P.O )
YPF : TIRE REAR 7.50-16LT/D BL D/NY TT HWY
ZN3 :
ZPF :TIRE SPARE 7.50-16LT/D BL D/NY TT HWY
ZY1 : COLOR COMBINATION, SOLID
Z8I : CAMPER PROVISIONS, SPECIAL
23I : INTERIOR TRIM, LT BLUE (91)
23W : TRIM COMBINATION, VINYL, BLUE (M)
29U : PRIMARY COLOR, EXTERIOR, DK BLUE (91)

LOOK Rear AXLE 4.10 Dana. now what dana would it be ? dana 80?