QU40598 1-1/4" Wide Stepped Hub Drive Gear

QU40598 1-1/4" Wide Stepped Gear for Dana 30, Dana 44, and GM 10 Bolt Front Axles. QU40598 was the original design. Outside spline that engages wheel hub is 27/32" wide. These gears are stepped on the outboard side to aid in removal and to space the gear back from the hub cap. QU40598 gears were usually used with QU40050 Spring and QU40035 Spring Plate. The back edge of the snap ring groove is approximately 5/16" from the end. Obsolete part, available while supplies last.

Also See: QU40598U Used 1-1/4" Wide Stepped Gear available while supplies last
Also See: QU40428U Used 7/8" Wide Single Width Gear available while supplies last
Also See: QU40657U Used 7/8" Wide Stepped Gear available while supplies last

Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!

Dan the Gear Man® Tech Notes:
Splined Hub Gears
Product Note
History
Spring and Plate
Matching Parts
Applications

Tech Note 1: Splined Hub Gears
QU40598/QU40428U/QU40657U Splined Front Hub Gears for Dana 30, Dana 44, and GM 10 Bolt Front Axles were used on 4x4s without lockout hubs from 1959 to 1993. These one piece, solid steel splined hub gears provide the strongest connection between your axle shaft and wheel hub. At least five different gears of were used on various vehicles over the years. QU40598/QU40428U/QU40657U are the most common variants.

Tech Note 2: Product Note
QU40598 stepped hub drive gears were mounted outboard of QU40035 Spring Plate and QU40050 Spring. The spring pushes the gear against the axle shaft snap ring providing outward tension on the axle shaft, which keeps the axle shaft engaged against the spindle thrust washer. On open knuckle axles, the spring tension also keeps the axle shaft fully seated with the spindle seal(s). The inner edge of the axle shaft snap ring is about 5/16" from the end.

Tech Note 3: History
Up until the early 1970s, splined hub gears were the "stock" equipment on most lighter 4x4s. If you wanted lockouts, you paid extra. With the advent of full time transfer cases in 1973, splined hub gears were used instead of lockouts on trucks with internally spined wheel hubs. When the full time transfer case fad died out after 1979, splined hub gears were pretty much dropped as factory equipment until Jeep (1982-1984) and Dodge (1985-1993) introduced Dana 44 front axles with vacuum controlled central axle disconnect. Today, splined hub gears are rare and out of production, but still in high demand for competition and severe off road use as they are by far, the strongest choice available for connecting the axle shaft to the wheel hub.

Tech Note 4: Spring and Plate
The large, inboard end of QU40050 Spring rests against QU40035 Cupped Spring Plate. If the plate is damaged, replace it at the same time you replace the spring. QU40035 cup-shaped plates are often installed backwards which will ruin the plate and outer wheel bearing. Install the plate so the FLAT side is towards the spring!

Tech Note 5: Matching Parts
Matching Parts for Splined Hub Gears:
QU40427 Chrome Hub Cap
QU40614 Axle Shaft Snap Ring
QU40035 Spring Plate
QU40050 Spring
QU40654 1-1/4" long Split Steel Steel Spacer
QU40221 Outer Axle Shaft for 1973-1991 GM Dana 44 and GM 10 Bolt
QU40389 Outer Axle Shaft for 1980-1993 Dodge Dana 44
QU56018 Warn Lockout Hub Set (Replaces all the original hub drive parts including this part)

Applications for QU40598/QU40428/QU40657 Splined Hub Gears:
(part will fit these models but may not have been original equipment for all years):

Chevy and GMC:
K5 Blazer, Jimmy, K10/K15/K1500/V1500 Truck and Suburban: 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979
K20/K25/K2500/V2500 Truck and Suburban: 1977.5, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991

Dodge:
W100: 1969, 1970, 1971, 1972, 1973, 1974
W150, W250 with Dana 44 axle: 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993

Ford:
F100, F150 (Dana 44): 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
Bronco Dana 30, Dana 44): 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979
F150, Bronco with Splined Wheel Hub (Dana 44IFS): 1988, 1989
F150 and Bronco (Dana 44IFS): 1990, 1991, 1992, 1993, 1994, 1995, 1996
F250 with 3300 Pound Dana 44: 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975
F250 (Dana 44): 1978, 1979
F250 (Dana 44IFS): 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996

IHC:
1100 with internal spline wheel hub: 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975

Jeep:
Cherokee, Wagoneer: 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
J10: 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
J20: 1977.5, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988