Thank you. Here is what I got -- I could not see the differential code in the photo you posted -- it is D53 then:
DL: Dodge Polara (Low)
41: 4 Door Sedan
N: 383-4BBL 8 CYL
1: 1971
D: Belvidere, IL, USA
239356: Sequence number
E63: 383 cid 4 barrel V8
D32: Heavy Duty Automatic Transmission
EW1: White Exterior Color
L1B2: Trim - Low, Cloth & Vinyl, Blue
GB2: Light Blue Poly Int. Door Frames
312: Build Date: March 12
J04633: Order number
(note the J-VON)
EW1: White Top Color
U: USA Specifications
B42: Front Disc Brakes w/H.D. 11in RR Drum
B51: Power Brakes
C85: Seat Spring - H.D. Front & Rear
C93: Carpet
D53: 3:23:1 Rear Axle Ratio
G11: Tinted Glass (all)
G33: LH Remote Racing Mirror
G41: Day/Night Inside Rear-View Mirror
H11: Heater
H31: Rear Window Defogger
F15:
65 Amp Alternator
F33:
Left-Hand 6" spotlight
F38:
Roof Light reinforcement
F81: Manual remote decklid release
J11: Glove Box Lock
J15: Cigar Lighter
J31: Dual Horns
M21: Roof drip rail moldings
M26: Wheel Lip Moldings
N41: Dual Exhaust
N81: Fast Idle Control
S16: Suspension H.D. Police
V5B: Body Side Stripes, Light Blue
Y14: Sold Car
Y39: Special Order