Holiday Notice: We will be closed for Thanksgiving on Thurs., November 27. Orders will ship the next business day. Please note that shipping carriers may have varied holiday hours. 

My Cart 0
  • Sign In
My Quote
Your Source for Truck Parts & More 1.877.DL.ORDER
  • Compare Products
main product photo
Out of stock

Fuller Countershaft Gear | 4303121

SKU
FUL 4303121
MPN
4303121
Special Price $119.48 Regular Price $149.35
Notify me when in stock
Add to Wish List Add to Compare

Have a Question for Our Team?

Our Customer Service team is ready to help. Call 1.877.DL.ORDER or Monday - Friday 8 AM - 4:30 PM ET

Description

The FUL 4303121 is a Fuller Countershaft Gear engineered to ensure smooth and efficient power transmission within your vehicle's transmission system. Crafted with precision and durability in mind, this countershaft gear delivers reliable performance and long-lasting durability.

WarningWARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov

Cross Reference
Cross Reference
PREDECESSORWWS 4303120, FUL 4303120, WWS 4303121, 9633 4303121
AUTOCAR INC4303121-SP
EATON CORPORATION4305080
EUROICAMBI35530868
FLEETPRIDE4303121
FREIGHTLINER CORPORATIONFUL 4303121
MACK TRUCKS, INC.3088-4303121, FUL4303121
NAVISTAR INTERNATIONAL TRANSPORTATION CORP.EAU4303121, FUL4303121, ZBF4303121
NEWSTARS-E326
PAI INDUSTRIES900069HP, 900069HP-010
STERLING TRUCK CORPORATIONFUL 4303121
TRUCKPRO LLCBH4303121, HF4303121
VOLVO TRUCKS NORTH AMERICA, INC.176863, FUL4303121
More Information
More Information
Shipping Weight (lb) 9.00
Manufacturer Fuller
Shipping Length (in) 12.00
Shipping Width (in) 12.00
Shipping Height (in) 2.00
Returnable Yes
Core Exchange No
More products from Fuller
  1. Fuller Lever Housing Kit | K2977
    Fuller Lever Housing Kit | K2977
    Special Price $79.16 Regular Price $98.95
    Add to Wish List Add to Compare
  2. Fuller Transmission Retaining Ring | 4303336
    Fuller Transmission Retaining Ring | 4303336
    Special Price $3.61 Regular Price $4.51
    Add to Wish List Add to Compare
  3. Fuller Cover Bearing Auxiliary Countershaft Gasket | 4307247
    Fuller Cover Bearing Auxiliary Countershaft Gasket | 4307247
    Special Price $6.62 Regular Price $8.27
    Add to Wish List Add to Compare
  4. Fuller Transmission Snap Ring | 14750
    Fuller Transmission Snap Ring | 14750
    Special Price $2.15 Regular Price $2.69
    Add to Wish List Add to Compare
  5. Eaton Fuller Shift Lever Bushing | 21246
    Eaton Fuller Shift Lever Bushing | 21246
    Special Price $2.24 Regular Price $2.80
    Add to Wish List Add to Compare
  6. Fuller O-ring | 15569
    Fuller O-ring | 15569
    Special Price $6.60 Regular Price $8.25
    Add to Wish List Add to Compare
  7. Fuller Transmissions Round Front Bearing Cover Gasket | 14311
    Fuller Transmissions Round Front Bearing Cover Gasket | 14311
    Special Price $2.26 Regular Price $2.83
    Add to Wish List Add to Compare
  8. Eaton Fuller Transmission/Woodruff Key | 4302316
    Eaton Fuller Transmission/Woodruff Key | 4302316
    Special Price $4.90 Regular Price $6.13
    Add to Wish List Add to Compare
  9. Fuller Transmission Gasket | 4302676
    Fuller Transmission Gasket | 4302676
    Special Price $5.79 Regular Price $7.24
    Add to Wish List Add to Compare
  10. Fuller PTO Gasket | 4305309
    Fuller PTO Gasket | 4305309
    Special Price $7.27 Regular Price $9.09
    Add to Wish List Add to Compare
  11. Fuller Transmission Filter Kit | K4272
    Fuller Transmission Filter Kit | K4272
    Special Price $91.08 Regular Price $113.85
    Add to Wish List Add to Compare
  12. Fuller Shift Lever Housing Assembly | S1967
    Fuller Shift Lever Housing Assembly | S1967
    Special Price $162.15 Regular Price $202.69
    Add to Wish List Add to Compare
© 2025 Duallane Truck Parts, Inc.