VIN help

[superwade57]

i have a 78 thats pretty much junk. except the axles are supposed to be dana 60 and corporate 14 with 5.xx:1 gears... this is what im told. it is impossible to get under the truck to verify numbers, i would have to dig the truck out from its grave as its very very overgrown into place as its been in its place for 20 years.

is there a way to know what the gears are based on vin or spid if its not specified? heres the info i have

VIN CKR248J149958

SPID
MODEL: CK20903
A28 SLIDING REAR WINDOW
E63 FLEETSIDE BED
G80 LOCKING DIF.
K76 61 AMP DELCOTRON GE
MX1 AUTO TRANS
NL2 AUX FUEL TANK
UO1 ROOF MARKER LIGHTS
VO2 TRANS OIL COOLER
XUE 9.50X16.5 TUBELESS
Z53 GAGES VOLTMETER
71W XRR1 RED CUSTOM VINYL
A01 SOFTRAY GLASS
DG4 EXT. B/EYE MIR (7.5"
F60 H.D. FRONT SPRINGS & HEAVY DUTY POWER BRAKES
LF4 400 4B ENG
NA2 STANDARD EMISSION
UA1 4000 WATT HD DELCO F
U63 AM PUSHBUTTON RADIO
U76 TOWING DEVICE
YUE 9.5X16.5 TUBELESS
Z62 SCOTTSDALE EQUIP
9V1 COLOR COMBINATION BL

I GOT THE BASIC VIN DECODE- 78 CHEVY 3/4TON 400CID MADE IN JANESVILLE. SEEMS LIKE A PRETTY WELL ORDERED TRUCK I JUST WISH I KNEW OR COULD VERIFY THAT THE GEARS ARE THE 5.13 THAT IM TOLD
THANKS A TON!