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HOMESERVICE MANUALSCHEVROLET1993SPORTVAN G30, VAN PASSENGER, 7.4 NREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 47 (DRIVE AXLE RATIO IDENTIFICATION)IDENTIFICATIONDANA BUILT AXLES

1993 Chevrolet Sportvan G30, Van Passenger, 7.4 N

DANA Built Axles

1993 Chevrolet Sportvan G30, Van Passenger, 7.4 NSECTION DANA Built Axles

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 1994 Oldsmobile Bravada, 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, and 1994 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Identification code is stamped on rear surface of right axle tube. In addition, the 3-digit axle code appears on tape strip attached to outboard end of axle tube.

NOTE: Drive axles are balanced with pinion flange (acts as a harmonic member to reduce driveline vibration). If ring and pinion gear set, pinion flange assembly or pinion bearings need replacement, replace entire axle assembly using appropriate system-balanced service axle assembly.

ASTRO & SAFARI REAR AXLE RATIO IDENTIFICATION

Application & Code

Ratio

7.625" Ring Gear

USM, USN ⁽¹⁾, UTM ⁽¹⁾, UTL ⁽¹⁾

3.23:1

USR ⁽¹⁾, USP ⁽¹⁾, UTP ⁽¹⁾

3.42:1

UST ⁽¹⁾, UTS

3.73:1

⁽¹⁾	With positive traction, limited slip differential.

ASTRO & SAFARI FRONT AXLE RATIO IDENTIFICATION

Application & Code	Ratio
7.625" Ring Gear (ZYD)	3.42:1

"C" SERIES REAR AXLE RATIO IDENTIFICATION

Application & Code

Ratio

8.5" Ring Gear

UMJ ⁽¹⁾, XPD, XPH ⁽¹⁾. XPL

3.08:1

RYS, RYX ⁽¹⁾, UUT, XPF, XPJ ⁽¹⁾, XPM, XPP ⁽¹⁾, XR

3.42:1

UUU, UUW ⁽¹⁾, XPG, XPK ⁽¹⁾

3.73:1

9.5" Ring Gear

RYA, RYF ⁽¹⁾, TXW, TXZ ⁽¹⁾

3.42:1

RYB, RYG ⁽¹⁾, TXX, TYA ⁽¹⁾

3.73:1

RYC, RYH ⁽¹⁾, SJA, TXY, TYB ⁽¹⁾

4.10:1

RYD, RYJ ⁽¹⁾

4.56:1

10.5" Ring Gear

RYK, RYN ⁽¹⁾

3.42:1

RYL, RYP ⁽¹⁾, XYL, XZC

3.73:1

RYM, RYR ⁽¹⁾, XUD, XYM, XYY, XZA, YAL

4.10:1

XYN, XYR, XYZ, XZB

4.56:1

11" Ring Gear

UXP, UXK, UXL

4.63:1

UXR

5.13:1

⁽¹⁾	With positive traction, limited slip differential.

"C/K" SERIES REAR AXLE RATIO IDENTIFICATION

Application & Code

Ratio

10.5" Ring Gear

AYA, AZA

3.42:1

CNB, XZK, XZL, YAK, YAN, YAX YBB, YBF, YBJ, YBM

3.73:1

XZM, XZN, YAL, YAS, YAT ⁽¹⁾, YAY, YAZ ⁽¹⁾ YBC ⁽¹⁾, YBG ⁽¹⁾, YBK, YBN ⁽¹⁾

4.10:1

YAM, YAU, YAW ⁽¹⁾, YBA ⁽¹⁾ YBD, YBH ⁽¹⁾, YBL, YBP ⁽¹⁾

4.56:1

⁽¹⁾	With positive traction, limited slip differential.

"G" SERIES REAR AXLE RATIO IDENTIFICATION

Application & Code

Ratio

8.5" Ring Gear

RKF, RKG ⁽¹⁾

3.08:1

RKH, RKJ ⁽¹⁾

3.42:1

RKK, RKL ⁽¹⁾

3.73:1

9.5" Ring Gear

RKM, RKU

3.23:1

RKX, RKZ

3.73:1

RKY ⁽¹⁾, RLA, XZR

4.10:1

RKR, RKW ⁽¹⁾, LZA

4.56:1

10.5" Ring Gear

RMU, RMX ⁽¹⁾, SYK, SYP ⁽¹⁾

3.42:1

RMW, RMY ⁽¹⁾, RMA, RMC ⁽¹⁾, SYL, SYR ⁽¹⁾, XSX, XSZ ⁽¹⁾

3.73:1

RKY, RLW, RLZ ⁽¹⁾, RMB, RMD ⁽¹⁾ SYM, SYS ⁽¹⁾, XSY, XTA ⁽¹⁾

4.10:1

RMG, RMJ ⁽¹⁾, SYT ⁽¹⁾, XTB, XTC ⁽¹⁾

4.56:1

⁽¹⁾	With positive traction, limited slip differential.

"K" SERIES REAR AXLE RATIO IDENTIFICATION

Application & Code

Ratio

8.5" Ring Gear

TYJ, USJ, UUX, UUY ⁽¹⁾, XRA ⁽¹⁾, XRD, XRF ⁽¹⁾, XPR, XPU ⁽¹⁾, XPY

3.42:1

UUZ, UWA ⁽¹⁾, XPC, XPS, XPW ⁽¹⁾, XPZ, XRB ⁽¹⁾, XRH ⁽¹⁾, XRG

3.73:1

UMT, UMX ⁽¹⁾

4.10:1

9.5" Ring Gear

TXN, TXS ⁽¹⁾, RYS, RYX ⁽¹⁾

3.42:1

TXP, TXT ⁽¹⁾, RYT, RYY ⁽¹⁾

3.73:1

TXR, TXU ⁽¹⁾, RYU, RYZ ⁽¹⁾, YCK, YCL ⁽¹⁾

4.10:1

RYW, RZA ⁽¹⁾

4.56:1

10.5" Ring Gear

RZB, RZF ⁽¹⁾

3.42:1

RGR, RZC, RZG ⁽¹⁾, SZY, XYS, XZJ

3.73:1

RZD, RZH ⁽¹⁾, XYT, XYW ⁽¹⁾, XZD, XZF ⁽¹⁾, YAL

4.10:1

XYU, XYX, XZG, XZH ⁽¹⁾

4.56:1

⁽¹⁾	With positive traction, limited slip differential.

"K" SERIES FRONT AXLE RATIO IDENTIFICATION ⁽¹⁾

Code

Ratio

ZLS, ZLW

3.42:1

ZLX, ZLT

3.73:1

⁽¹⁾	8.25" ring gear is used on K1 and K2 models. 9.25" ring gear is used on K3 models. No other information is available from manufacturer.

"P" SERIES REAR AXLE RATIO IDENTIFICATION ⁽¹⁾

Application & Code

Ratio

10.5" Ring Gear

SDK, SGB, SDN ⁽²⁾, SDR, SDU ⁽²⁾

3.73:1

SDL, SDS, SDX

4.10:1

SDM, SDP, SDT, SDW ⁽²⁾, SDY, SFA ⁽²⁾, UWS, UWW

4.56:1

TJY ⁽²⁾

4.88:1

SDZ, UWU

5.13:1

11.0" Ring Gear

UWH

4.63:1

TFT, TFU, UWJ

5.13:1

⁽¹⁾	1994 information not available from manufacturer.

⁽²⁾	With positive traction, limited slip differential.

"S" & "T" SERIES REAR AXLE RATIO IDENTIFICATION

Application & Code

Ratio

7.625" Ring Gear

TFY, YDJ

2.73:1

TGB, UBR, USZ, UTA, YCM ⁽¹⁾, YDM YDR, YDU, YDK ⁽¹⁾, YDL, YDC

3.08:1

SZM, SZN ⁽¹⁾, UBT ⁽¹⁾, UTB, UTC ⁽¹⁾, UBS ⁽¹⁾, YDP YDS, YDT, YDW, YDX

3.42:1

XRJ, XZU ⁽¹⁾, YDY ⁽¹⁾, YDZ ⁽¹⁾

3.73:1

UYC, XRK

4.10:1

⁽¹⁾	With positive traction, limited slip differential.

"T" SERIES FRONT AXLE RATIO IDENTIFICATION ⁽¹⁾

Code

Ratio

ZBX

3.08:1

SKY, ZBY, ZYD, ZYH

3.42:1

SKZ, ZPC, ZPU, ZYF

3.73:1

⁽¹⁾	7.5" ring gear is used. No other information is available from manufacturer.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.