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Rear Axle Gear Ratio

 
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Rear Axle Gear Ratio - 1/11/2011 23:39:55  1 votes
Ben

 

Posts: 194
Score: 66
Joined: 4/6/2011
Status: offline
The easiest way to find out which rear end gear ratio your van has is to look at the RPO sticker. The RPO codes will tell you all of your vans specific options including your rear end gear ratio.

RPO AXLE CODE LIST

GU2 2:73

GU4 3:08

GU5 3:23

GU6 3:42

GT4 3:73

GT5 4:10

GQ1 Open Differential Rear Axle

G80 GOV-LOC Rear Axle




The RPO code on the sticker only shows you which rear axle was installed at the factory. If you are not the original owner of your van and don't know for sure if the axle has been replaced or not the only way to be sure what your rear axle ratio is will be to look at the factory code stamped on the axle itself.

To find out which gear ratio your rear axle has look at the spot where the rear brake cable runs right across the axel, you might need to clean off the axle to see the letters and numbers clearly.

The code is usually located on the front of the tube on the passengers side of the van.

The first 3 letters of the code stamp are the ones that matter, compare them to the list below to determine you gear ratio.

FAA: 7.5", 2.56 open (1985-1986 Astro)
FAF: 7.5", 2.73 open (1988 Astro)
FAG: 7.5", 3.08 open (1988-1989 Astro)
FAH: 7.5", 3.42 open (1988-1989 Astro)
FAJ: 7.5", 2.73 posi (1988 Astro)
FAK: 7.5", 3.08 posi (1988-1989 Astro)
FAL: 7.5", 3.42 posi (1988-1989 Astro)
FAM: 7.5", 3.73 open (1988-1989 Astro)
FAN: 7.5", 3.73 posi (1988-1989 Astro)
FAP: 7.5", 4.10 open (1988-1989 Astro)
FAR: 7.5", 4.10 posi (1988-1989 Astro)
FAS: 7.5", 3.23 open (1988-1989 Astro)
FAT: 7.5", 3.23 posi (1988-1989 Astro)
FBA: 7.5", 2.56 posi (1985-1986 Astro)
FCA: 7.5", 2.73 open (1985-1987 Astro)
FCB: 7.5", 2.73 posi (1985-1986 Astro)
FFA: 7.5", 3.08 open (1985-1987 Astro)
FFB: 7.5", 3.08 posi (1985-1986 Astro)
FMA: 7.5", 3.42 open (1985-1987 Astro)
FMB: 7.5", 3.42 posi (1985-1986 Astro)
FRA: 7.5", 3.73 open (1985-1987 Astro)
FRB: 7.5", 3.73 posi (1985-1986 Astro)
FSA: 7.5", 4.11 open (1985-1986 Astro)
FSD: 7.5", 4.11 posi (1985-1986 Astro)

GWH: 7.5", 4.10 open (1985-1987 Astro)
GWJ: 7.5", 4.10 posi (1985-1986 Astro)

HZA: 7.5", 2.73 posi (1987 Astro)
HZB: 7.5", 3.08 posi (1987 Astro)
HZC: 7.5", 3.42 posi (1987 Astro)
HZF: 7.5", 3.73 posi (1986 Astro)
HZG: 7.5", 4.11 posi (1986-1987 Astro)

KJM: 7.5", 2.73 open (1987 Astro)
KJN: 7.5", 3.08 open (1987 Astro)
KJP: 7.5", 3.42 open (1987 Astro)
KJR: 7.5", 2.73 posi (1987 Astro)
KJS: 7.5", 3.08 posi (1987 Astro)
KJT: 7.5", 3.42 posi (1987 Astro)
KJU: 7.5", 3.73 open (1987 Astro)
KJW: 7.5", 3.73 posi (1987 Astro)
KJX: 7.5", 4.10 open (1987 Astro)
KJY: 7.5", 4.10 posi (1987 Astro)
KRK: 7.5", 2.73 open (1987 Astro)
KRL: 7.5", 3.08 open (1987 Astro)
KRM: 7.5", 3.42 open (1987 Astro)
KRN: 7.5", 2.73 posi (1987 Astro)
KRP: 7.5", 3.08 posi (1987 Astro)
KRR: 7.5", 3.42 posi (1987 Astro)
KRS: 7.5", 3.73 open (1987 Astro)
KRT: 7.5", 3.73 posi (1987 Astro)
KRU: 7.5", 4.10 open (1987 Astro)
KRW: 7.5", 4.10 posi (1987 Astro)

PZK: 7.625", 4.10 open (1990 Astro)
PZL: 7.625", 4.10 posi (1990 Astro)

RHB: 7.625", 3.23 open (1990 Astro)
RHC: 7.625", 3.23 posi (1990 Astro)
RHD: 7.625", 3.42 open (1990 Astro)
RHF: 7.625", 3.42 posi (1990 Astro)
RHG: 7.625", 3.73 open (1990 Astro)
RHH: 7.625", 3.73 posi (1990 Astro)
RHL: 7.625", 3.23 open (1990 Astro)
RHM: 7.625", 3.42 open (1990 Astro)
RHN: 7.625", 3.73 open (1990 Astro)
RHP: 7.625", 3.23 posi (1990 Astro)
RHR: 7.625", 3.42 posi (1990 Astro)
RHS: 7.625", 3.73 posi (1990 Astro)
RHT: 7.625", 4.10 open (1990 Astro)
RHU: 7.625", 4.10 posi (1990 Astro)

SGF: 7.625", 3.23 open (1991 Astro)
SGG: 7.625", 3.23 posi (1991 Astro)
SGH: 7.625", 3.42 open (1991 Astro)
SGJ: 7.625", 3.42 posi (1991 Astro)
SGK: 7.625", 3.73 open (1991 Astro)
SGL: 7.625", 3.73 posi (1991 Astro)
SGM: 7.625", 4.10 open (1991 Astro)
SGN: 7.625", 4.10 posi (1991 Astro)
SGS: 7.625", 3.23 open (1991 Astro)
SGT: 7.625", 3.23 posi (1991 Astro)
SGU: 7.625", 3.42 open (1991 Astro)
SGW: 7.625", 3.42 posi (1991 Astro)
SGX: 7.625", 3.73 open (1991 Astro)
SGY: 7.625", 3.73 posi (1991 Astro)
SHD: 7.625", 3.23 open (1990 Astro)
SHF: 7.625", 3.23 posi (1990 Astro)
SHG: 7.625", 3.42 open (1990 Astro)
SHH: 7.625", 3.42 posi (1990 Astro)
SHJ: 7.625", 3.73 open (1990 Astro)
SHK: 7.625", 3.73 posi (1990 Astro)
SHL: 7.625", 4.10 open (1990 Astro)
SHM: 7.625", 4.10 posi (1990 Astro)
SHR: 7.625", 3.23 open (1990 Astro)
SHS: 7.625", 3.23 posi (1990 Astro)
SHT: 7.625", 3.42 open (1990 Astro)
SHU: 7.625", 3.42 posi (1990 Astro)
SHW: 7.625", 3.73 open (1990 Astro)
SHX: 7.625", 3.73 posi (1990 Astro)
SHY: 7.625", 4.10 open (1990 Astro)
SHZ: 7.625", 4.10 posi (1990 Astro)

TZD: 7.625", 3.23 open (late 1995 Astro)
TZF: 7.625", 3.23 posi (late 1995 Astro)
TZG: 7.625", 3.42 open (early 1995 Astro)
TZH: 7.625", 3.42 posi (late 1995 Astro)
TZJ: 7.625", 3.73 open (late 1995 Astro)
TZK: 7.625", 3.73 posi (late 1995 Astro)

USN: 7.625", 3.23 posi (1993-early 1995 Astro)

UTM: 7.625", 3.23 posi (1991-1992 Astro)
UTN: 7.625", 3.42 posi (1993-early 1995 Astro)
UTP: 7.625", 3.42 posi (1991 Astro)
UTR: 7.625", 3.73 open ('91-early '95 Astro)
UTS: 7.625", 3.73 posi ('91-early '95 Astro)
UTT: 7.625", 3.23 open (1991-1992 Astro)
UTU: 7.625", 3.23 posi (1991-1992 Astro)
UTW: 7.625", 3.42 open (1991-1992 Astro)
UTX: 7.625", 3.42 posi (1991-1992 Astro)
UTY: 7.625", open (1991-1992 Astro)
UTZ: 7.625", 3.73 posi (1991-1992 Astro)

VAC: 7.625", 3.23 open (1996-1997 Astro)
VBC: 7.625", 3.23 posi (1996-1997 Astro)
VCC: 7.625", 3.42 open (1996-1997 Astro)
VDC: 7.625", 3.42 posi (1996-1997 Astro)
VFC: 7.625", 3.73 open (1996-1997 Astro)
VGC: 7.625", 3.73 posi (1996-1997 Astro)
VKA: 7.625", 3.42 posi (1995 Astro-Export)
VKC: 7.625", 3.42 posi (1996-1997 Astro-Export)
VLA: 7.625", 3.73 posi (1995 Astro-Export)
VLC: 7.625", 3.73 posi (1996-1997 Astro-Export)
Post #: 1
RE: Rear Axle Gear Ratio - 2/11/2011 0:01:59   
Astroshepawd


Posts: 1214
Score: 16
Joined: 25/10/2006
From: South Island (no not NZ)
Status: offline
Before everybody shouts "What or where is my RPO or Service Parts Identification Label" A great deal of vans imported from Japan have had the labels removed, probably during the conversion process?
Early vans had the label in the central glove box, later vans in either or of the front door jam's or under the hood? If you had one it would be noticeable and have 'Service Parts Identification' written along the top along with 'Do not Remove' .
The label lists all the parts and options fitted to the van when it left the factory in code form.
Do not worry about missing labels there are other ways of retrieving this info from the vehicle VIN #.

(in reply to Ben)
Post #: 2
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