Transmission Oil
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Bel Ray - Big Twin Transmission Oil 1L
Bel Ray
$20.99Formulated for motorcycles with separate transmissions and or final drives Wear protection extends gear life Quiets gear whine and improves shifting For Big Twin, air cooled / liquid cooled transmissions and final drives API...$20.99 -
Red Line - V-Twin Transmission OIl W/Shockproof 1QT
Red Line
$25.49This product dampens transmission noise (reducing the notorious shifting clunk found in these gearboxes), dramatically reduces temperature, provides thicker oil films between gear teeth and resists throw-off For all aftermarket versions like Baker,...$25.49 -
Red Line - Gear Oil W/Shockproof 80W 1QT
$29.99Popular for Sportster V-Twin transmissions ShockProof® features microscopic solid medium to provide cushioning between gear teeth, while maintaining lower drag Provides consistent shifting and wet-clutch operation$29.99 -
Bel-Ray - 96925-BT1 - Sport Transmission Fluid - 1L
Bel Ray
$19.99Bel-Ray - 96925-BT1 - Sport Transmission Fluid - 1LFeaturesMSDS Migration DataFormulated for Harley Davidson Sportster® transmissions & primary gearboxesExtreme pressure additives to reduce component wearPrevents clutch slipping and chatter for...$19.99 -
Maxima Racing Oil - 40-02901 - V-Twin Transmission Oil - 80W-90 - 1 U.S. quart
Maxima Racing Oil
$21.99Maxima Racing Oil - 40-02901 - V-Twin Transmission Oil - 80W-90 - 1 U.S. quartFeaturesMSDS Migration DataFormulated specifically for H-D transmissions or V-Twin models without wet-clutchesHigh film strength gear oil for Big Twins provides excellent...$21.99 -
V-Twin - 41-0993 - Motorshop Ready Transmission/Primary Lube
Motorshop
$67.71V-Twin - 41-0993 - Motorshop Ready Transmission/Primary LubeDescriptionMotorshop ready transmission/primary formulated lube is a synthetic blend lube to provide excellent lubricity for the anti-wear requirements of transmission gears and primary...$67.71 -
V-Twin - 41-0199 - 85W90 Spectro Hypoid Transmission Gear Lube
Spectro Oils
$29.69V-Twin - 41-0199 - 85W90 Spectro Hypoid Transmission Gear LubeDescription85W-90 hypoid transmission gear lube - Ground Ship Only Fits:AllAdditional Information UOM1 - EA ManufacturerSpectro Oils OriginUSA$29.69 -
V-Twin - 41-0193 - Spectro Full Synthetic 6 Speed 75W/140 Transmission Lube
Spectro Oils
$349.86V-Twin - 41-0193 - Spectro Full Synthetic 6 Speed 75W/140 Transmission LubeDescriptionSpectro Heavy Duty Platinum Spectro Full Synthetic 6 Speed 75W/140 Transmission Lube carries a GL5 designation.Sold as a case of 12 quart bottles. Fits:AllAdditional...$349.86 -
V-Twin - 41-0162 - OE Semi-Synthetic Transmission Oil
OE
$28.86V-Twin - 41-0162 - OE Semi-Synthetic Transmission OilDescriptionFor those who want nothing but OEM. V-Twin offers OE HD Semi-Synthetic Transmission Lube. Comes in a 32 ounce bottle.This special multiviscosity gear lubricant is for use in all 4 and...$28.86 -
V-Twin - 41-0160 - 75W-140 Synthetic Transmission Oil, GL-1
Spectro Oils
$36.25V-Twin - 41-0160 - 75W-140 Synthetic Transmission Oil, GL-1Description75-140W Spectro synthetic transmission oil, GL-1 comes in a 32 ounce bottle. Fits:All modelsAdditional Information UOM1 - EA ManufacturerSpectro Oils OriginUSA 2025 Catalog...$36.25 -
Maxima Racing Oil - 40-01901 - V-Twin Transmission Oil - 85W-140 - 1 U.S. quart
Maxima Racing Oil
$23.99Maxima Racing Oil - 40-01901 - V-Twin Transmission Oil - 85W-140 - 1 U.S. quartFeaturesMSDS Migration DataHeavy-duty formula for Big Twins offers extended performance in severe operating conditionsUltra-high film strength gear oil provides excellent...$23.99 -
Klotz Oil - KH-GL90 - Big Twin Synthetic Transmission Lube - 80W-90 - 1 U.S. quart
Klotz Oil
$26.95Klotz Oil - KH-GL90 - Big Twin Synthetic Transmission Lube - 80W-90 - 1 U.S. quartFeaturesMSDS Migration DataCustom-formulated to meet or exceed warranty requirements for H-D Big Twin modelsTechniPlate technology reduces friction, absorbs gear shock...$26.95 -
Klotz Oil - KH-GL140 - Big Twin Synthetic Transmission Lube - 75W-140 - 1 U.S. quart
Klotz Oil
$27.95Klotz Oil - KH-GL140 - Big Twin Synthetic Transmission Lube - 75W-140 - 1 U.S. quartFeaturesMSDS Migration DataCustom-formulated to meet or exceed warranty requirements for H-D Big Twin modelsTechniPlate technology reduces friction, absorbs gear shock...$27.95 -
Bel-Ray - 99250-B1LW - Gear Saver Transmission Oil - 80wt - 1L
Bel Ray
$19.99Bel-Ray - 99250-B1LW - Gear Saver Transmission Oil - 80wt - 1L Features OE reference MSDS Migration Data Formulated to protect transmission gears from wear Positive clutch engagement for better starts and longer clutch life For 2T/4T...$19.99 -
Bel-Ray - 99234-B1LW - Hypoid Gear Oil - 85W-140 - 1L
Bel Ray
$20.99Bel-Ray - 99234-B1LW - Hypoid Gear Oil - 85W-140 - 1LFeaturesMSDS Migration DataFormulated for gearboxes and final drive units without a wet clutchSmooth shifting and reduced gear whineExtreme Pressure additives reduce component wearFor motorcycles and...$20.99 -
Castrol Classic - Gear SAE 90 Oil
Castrol
$51.55Castrol Classic - Gear SAE 90 Oil Castrol Classic 90W is a monograde oil for straight cut gears, gearboxes and differentials where a non low EP gear oil is specified. Designated as API GL-3. Sold as 1 liter. Fitment: All models$51.55 -
Out of stock
V-Twin - 41-0186 - 85W-140 Spectro Transmission Oil
Spectro Oils
$221.39V-Twin - 41-0186 - 85W-140 Spectro Transmission OilDescription85W-140 Transmission oil - Ground Ship Only Fits:AllAdditional Information UOM12 - CS ManufacturerSpectro Oils OriginUSA 2025 Catalog Pages1272$221.39
Harley Transmission Oil
Smooth shifting starts with the right transmission oil. At Deadbeat Customs, we carry high-performance transmission fluids formulated specifically for Harley-Davidson gearboxes. These oils reduce wear on gears and bearings, quiet down the drivetrain, and hold strong under high heat and heavy loads. Choose from trusted brands such as Maxima, Klotz, Red Line, Bel-Ray, Drag Specialties, and Spectro to keep your Harley shifting clean and running cool. Regular fluid changes go a long way in protecting your transmission and keeping every gear change smooth and precise.