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Heavy-Duty Truck Transmission Parts

Not sure which part you need? Use our parts-request checklist.

Keep your Class 8 trucks shifting and on the road with heavy-duty truck transmission parts built for over-the-road and vocational duty. JAK'S Diesel stocks rebuild and service components for manual heavy-duty truck transmissions: shafts, gears, synchronizers, bearings, seals, shift forks, and gaskets.

Not sure of the exact part on your unit? Give us the transmission make and model or the number stamped on the case and we will cross-reference OEM, competitor, and superseded numbers to get you the right component. Most orders ship same-day, with free freight over $1,000.

Browse transmission bearings for the mainshaft, countershaft and other verified transmission applications.

Showing 36 of 1114 Heavy-Duty Truck Transmission Parts
900475 Fuller Rebuild Kit
900475 Fuller Rebuild Kit
Catalog refs: EF61030 12815 · EGS-3905-021 446GC1215
JAK'S JAKS-900475
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$1,910.99
900418 RANGE CYLINDER KIT
900418 RANGE CYLINDER KIT
Catalog refs: FULLER K-2427 · MACK 3088-K2427
JAK'S JAKS-900418
Available to order · Confirm dispatch
$25.37
GGB-6321 Mack GEAR
GGB-6321 Mack GEAR
Catalog refs: MACK 751KB223 · MACK 751KB223B
JAK'S JAKS-EM63210
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Product photo awaiting verification
900368 Fuller T2 VALVE MOUNTING BRACKET
Catalog refs: FULLER 691355 · EATON CORP./ INDUSTRIAL PLYMER PROD 691355
JAK'S JAKS-900368
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Product photo awaiting verification
900586 Fuller SCREW (Pack of 8)
Catalog refs: FULLER X-8L-540 · VOLVO 3947105
JAK'S JAKS-900586
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