Eaton Fuller FS-6406N Parts Manual
This is the Eaton Fuller Illustrated Parts List covering the FS-6406N transmission. Use it to identify every serviceable part in your unit — assemblies, gears, shafts, housings and seals — before you order replacements.
| Models covered | FS-6406N |
| Transmission type | 6-speed, twin-countershaft, heavy duty |
| Document | Illustrated Parts List (Eaton Fuller) |
| Length | 19 pages |
| Format | PDF — view below or download free |
What’s inside
- Service kits & assemblies with recommended stocking quantities
- Mainshaft & countershaft gear groups
- Drive gears, idler & auxiliary drive gears
- Case, clutch & shift-bar housings
- Shift lever, forks & selector assemblies
- Bearings, seals, snap rings & small parts
- Air-shift and range-control components (where fitted)
- Exploded parts diagrams with OEM part numbers
Read the manual
This is the complete factory parts breakdown for the Eaton Fuller FS-6406N — every part in the manual, matched to our live inventory. We stock 138 of the 146 parts below; click any part number to view it, or add it straight to your cart. Click a number on any diagram to jump to that part.
Case Countershaft Assy Input Shaft Kits & Assemblies Lever Assy Mainshaft Assy Reverse Idler Gear Assy Shift Bar Housing
No parts match that search — try the part number with no dashes.
Case
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | A-5634 | Clutch Hsg Assy | 1 | Replaces 23726, 3316236, 3316237, A-5632, A-5771. #2 ALUMINUM, ABOVE CENTER LINE PULL TYPE | $429.71 | Add to Cart |
| 2 | S-2952 | Case Assy | 1 | Replaces 3316276, 4301285, 4304643, 4305177. | $1,717.12 | Add to Cart |
| 3 | 4300301 | FITTING-45 Degree | 2 | Replaces 11H15. | $5.45 | Add to Cart |
| 4 | 201398 | Pto Cover | 2 | $9.08 | Add to Cart | |
| 5 | 12815 | Bushing | 4 | $5.26 | Add to Cart | |
| 6 | 239613 | Capscrew | 12 | 3/8"-16X5/8" | $4.45 | Add to Cart |
| 7 | 23380 | Cover | 1 | Replaces 206466. | $5.20 | Add to Cart |
| 8 | 3315679 | Plug | 1 | $5.72 | Add to Cart | |
| 10 | X-8L-408 | Screw & Washer Assy | 2 | $1.79 | Add to Cart | |
| 11 | X-8-1011 | Capscrew | 4 | Replaces 1C1036. 5/8"-11X2-1/4" | $3.64 | Add to Cart |
| 12 | X-3-1000 | Lockwasher | 4 | 5/8" | $1.69 | Add to Cart |
| 15 | 3315659 | Gasket | 1 | $2.58 | Add to Cart | |
| 16 | 4300888 | Front Brg Cover-pull | 1 | $203.38 | Add to Cart | |
| 17 | 4300121 | Oil Seal | 1 | Replaces 3315623. | $9.12 | Add to Cart |
| 18 | 239614 | Screw | 6 | 5/16-18X.81 | $7.31 | Add to Cart |
| 21 | 3315681 | Shim .004 | 1 | QUANTITY AS REQUIRED | $3.01 | Add to Cart |
| 21 | 3315682 | Shim .007 | 1 | QUANTITY AS REQUIRED | $2.24 | Add to Cart |
| 21 | 3315683 | Shim .010 | 1 | QUANTITY AS REQUIRED | $3.06 | Add to Cart |
| 21 | 3315684 | Shim .020 | 1 | QUANTITY AS REQUIRED | $3.74 | Add to Cart |
| 21 | 4300977 | Shim .040 | 1 | $3.34 | Add to Cart | |
| 23 | X-12-1207 | Pipe Plug | 1 | Replaces X121202X121206. 3/4" MAGNETIC | $4.53 | Add to Cart |
| 24 | X-12-1209 | Pipe Plug | 1 | $8.05 | Add to Cart | |
| 27 | 4301607 | C/s Rear Brg Cover | 1 | $72.73 | Add to Cart | |
| 30 | 3316160 | Speedo Rotor | 1 | $71.38 | Add to Cart | |
| 31 | 711123 | Bearing Cup | 1 | — | Call for availability | |
| 32 | 3315662 | Shim .004 | 1 | QUANTITY AS REQUIRED | $5.74 | Add to Cart |
| 32 | 3315663 | Shim .007 | 1 | QUANTITY AS REQUIRED | $6.73 | Add to Cart |
| 32 | 3315664 | Shim .010 | 1 | QUANTITY AS REQUIRED | $3.71 | Add to Cart |
| 32 | 3315665 | Shim .020 | 1 | QUANTITY AS REQUIRED | $5.51 | Add to Cart |
| 32 | 4300978 | Shim .040 | 1 | $12.31 | Add to Cart | |
| 33 | K-7045 | Rear Brg Cover Kit | 1 | Replaces 4302621. | $158.90 | Add to Cart |
| 34 | 4300119 | Oil Seal | 1 | $11.37 | Add to Cart | |
| 36 | K-3411 | Nut Kit | 1 | Replaces 21937, 4301920, 4304690. | $34.14 | Add to Cart |
| 37 | 239436 | Washer | 4 | 1/2" | $2.49 | Add to Cart |
| 38 | 86D8 | Nut | 4 | Replaces 86D08. 1/2"-20 | $2.63 | Add to Cart |
| 44 | X-8C-604 | Capscrew | 4 | 3/8"-16X1-1/4" | $3.74 | Add to Cart |
| 47 | 14373 | Magnet | 1 | $3.89 | Add to Cart | |
| 49 | 239433 | Stud | 4 | 1/2"-20X2-5/16" | $5.16 | Add to Cart |
| 50 | X-12-405 | Pipe Plug | 1 | $2.19 | Add to Cart | |
| 52 | 238370 | Lifting Eye | 1 | $4.99 | Add to Cart |
Countershaft Assy
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | 3315686 | Snap Ring | 1 | $5.26 | Add to Cart | |
| 2 | 3315687 | Washer | 1 | $20.36 | Add to Cart | |
| 3 | K-3796 | Countershaft Brg Kit | 1 | Replaces 5557008, 5557506. | — | No longer available — call for replacement |
| 5 | 3315752 | Snap Ring | 1 | Replaces 3315751. | $5.01 | Add to Cart |
| 6 | 4304935 | Drive Gear-cntrshft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $102.30 | Add to Cart |
| 7 | 4304936 | 5TH Gear-cntrshft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $110.09 | Add to Cart |
| 8 | 4304937 | 4TH Gear-cntrshft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $165.51 | Add to Cart |
| 9 | 4304938 | 3RD Gear-cntrshft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $164.55 | Add to Cart |
| 10 | 230292 | Key | 2 | $4.27 | Add to Cart | |
| 11 | 4304934 | Countershaft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $398.19 | Add to Cart |
| 12 | 658981 | Bearing Cone | 1 | — | Call for availability | |
| 13 | 660181 | Bearing Cup | 1 | — | Call for availability |
Input Shaft
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | 675250 | Bearing Cup | 1 | — | Call for availability | |
| 2 | 742259 | Bearing Cone | 1 | — | Call for availability | |
| 3 | 4304933 | Input SHAFT-1.75" | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $198.86 | Add to Cart |
Kits & Assemblies
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| K-2183 | Shim Kit | 1 | $65.70 | Add to Cart | ||
| K-3411 | Nut Kit | 1 | Replaces 21937, 4301920, 4304690. | $34.14 | Add to Cart | |
| K-3421 | Synchronizer Kit | 1 | Replaces K-7004. | $515.53 | Add to Cart | |
| K-3422 | Small Parts Kit | 1 | $132.86 | Add to Cart | ||
| K-3423 | Basic Rebuild Kit | 1 | $475.20 | Add to Cart | ||
| K-3796 | Countershaft Brg Kit | 1 | — | No longer available — call for replacement | ||
| K-7028 | Gasket Kit | 1 | $17.54 | Add to Cart | ||
| K-7045 | Rear Brg Cover Kit | 1 | Replaces 4302621. | $158.90 | Add to Cart | |
| K-7051 | Synchronizer Kit -3/4 | 1 | $487.91 | Add to Cart | ||
| K-7061 | Shift Lever Hsg Kit | 1 | Replaces 241075, 4302711, A-6439. ALUMINUM HOUSING MEDIUM - LEVER HEIGHT 3-1/8" | $54.04 | Add to Cart | |
| S-2861 | Shift Bar Hsg Assy | 1 | Replaces 4303606. COMPLETE REVERSE SWITCH POSITION - RIGHT FRONT | $1,269.02 | Add to Cart | |
| S-2952 | Case Assy | 1 | Replaces 3316276, 4301285, 4304643, 4305177. | $1,717.12 | Add to Cart |
Lever Assy
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 2 | 23180 | Pin | 2 | $4.86 | Add to Cart | |
| 3 | 4300690 | Spring | 1 | Replaces 229337. | $9.49 | Add to Cart |
| 4 | 23181 | Washer | 1 | $2.77 | Add to Cart | |
| 5 | 241076 | Shift Lever 27-1/2 | 1 | STRAIGHT LEVER - "BEND TO SUIT" | $369.68 | Add to Cart |
| 6 | 202484 | Dust Cover | 1 | $7.34 | Add to Cart | |
| 7 | 4301958 | Gasket | 1 | $13.93 | Add to Cart | |
| 8 | X-8C-604 | Capscrew | 4 | 3/8"-16X1-1/4" | $3.74 | Add to Cart |
| 9 | 201401 | Shift Knob | 1 | 3/8"X24 THREAD | $19.73 | Add to Cart |
| 10 | K-7061 | Shift Lever Hsg Kit | 1 | Replaces 241075, 4302711, A-6439. ALUMINUM HOUSING MEDIUM - LEVER HEIGHT 3-1/8" | $54.04 | Add to Cart |
Mainshaft Assy
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 4 | 710787 | Bearing Cone | 1 | $35.16 | Add to Cart | |
| 5 | 4301467 | Synchronizer Cup 5/6 | 2 | $44.85 | Add to Cart | |
| 6 | A-6608 | Synchronizer Assy 5/6 | 1 | Replaces A-6137. | $370.99 | Add to Cart |
| 7 | 4301476 | Clutch Hub 5/6 | 1 | $48.99 | Add to Cart | |
| 8 | 4304932 | 5TH Gear-mainshaft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $103.95 | Add to Cart |
| 9 | 3315737 | Bearing | 2 | $26.96 | Add to Cart | |
| 10 | 3315728 | Snap Ring | 1 | Replaces 3315729. | $3.06 | Add to Cart |
| 11 | 3315727 | Washer | 1 | $28.00 | Add to Cart | |
| 12 | 4304931 | 4TH Gear-mainshaft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $125.17 | Add to Cart |
| 13 | 4124075 | Bearing | 2 | $34.53 | Add to Cart | |
| 14 | 4301466 | Synchronizer Cup 3/4 | 2 | $49.75 | Add to Cart | |
| 15 | 3315725 | Snap Ring | 2 | $3.33 | Add to Cart | |
| 16 | A-6136 | Synchronizer Assy 3/4 | 1 | Replaces 43014574304050. | $441.59 | Add to Cart |
| 17 | 4301475 | Clutch Hub 3/4 | 1 | $36.51 | Add to Cart | |
| 18 | 4304930 | 3RD Gear-mainshaft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $138.98 | Add to Cart |
| 19 | 3315722 | Bearing | 2 | $19.60 | Add to Cart | |
| 20 | 3315717 | Snap Ring | 1 | Replaces 3315718. | $4.63 | Add to Cart |
| 21 | 3315719 | Washer | 1 | $42.55 | Add to Cart | |
| 22 | 4304929 | 2ND Gear-mainshaft | 1 | ORDERS FOR THIS PART MUST BE PLACED THRU A NAVISTAR INTERNATIONAL DEALER | $178.78 | Add to Cart |
| 23 | A-7934 | Synchronizer Assy 1/2 | 1 | Replaces 4304551, A-6801, A-6932. | $868.26 | Add to Cart |
| 24 | 4304545 | 1ST Gear-mainshaft | 1 | Replaces 4303809, 4303946. | $314.01 | Add to Cart |
| 25 | 4304547 | Reverse Gear- Mainshaft | 1 | $234.42 | Add to Cart | |
| 26 | 4301474 | Clutch Hub-rev | 1 | $42.60 | Add to Cart | |
| 27 | 4304550 | Sliding Clutch-rev | 1 | $102.98 | Add to Cart | |
| 28 | 10J06 | Steel Ball | 2 | 3/16" | $1.71 | Add to Cart |
| 31 | 3315703 | Bearing | 4 | $40.64 | Add to Cart | |
| 33 | 4304549 | Mainshaft | 1 | Replaces 4303808. | $380.23 | Add to Cart |
| 34 | 4301492 | Washer | 1 | $20.56 | Add to Cart | |
| 35 | 5557003 | Bearing Cone | 1 | — | Call for availability | |
| 36 | 4304555 | Bearing | 1 | $95.58 | Add to Cart |
Reverse Idler Gear Assy
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 15 | 3315674 | Bearing | 2 | $19.40 | Add to Cart | |
| 16 | 3315676 | Spacer | 1 | $22.06 | Add to Cart | |
| 18 | 3315672 | Reverse Idler Shaft | 1 | $133.45 | Add to Cart | |
| 19 | 10J06 | Steel Ball | 1 | 3/16" | $1.71 | Add to Cart |
| 20 | 4304318 | Reverse Idler Gear | 1 | $125.30 | Add to Cart |
Shift Bar Housing
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | A-6744 | Shift Bar Hsg Assy | 1 | Replaces 3315760, 4302947. | $190.54 | Add to Cart |
| 2 | 4300854 | Gasket | 1 | Replaces 3315678. | $6.04 | Add to Cart |
| 3 | X-8C-600 | Capscrew | 12 | Replaces 239611. 3/8"-16X1" | $4.58 | Add to Cart |
| 4 | 3315765 | Spring | 4 | $2.77 | Add to Cart | |
| 5 | 10J14 | Steel Ball | 13 | 7/16" | $1.81 | Add to Cart |
| 6 | 201044 | Pin | 2 | $2.91 | Add to Cart | |
| 7 | 4301719 | Ball Retainer- Reverse | 1 | $1.76 | Add to Cart | |
| 19 | 21736 | Snap Ring | 1 | $2.02 | Add to Cart | |
| 21 | 3316296 | Plunger | 1 | $18.55 | Add to Cart | |
| 22 | 3316298 | Washer | 1 | $4.99 | Add to Cart | |
| 23 | 21723 | Spring | 1 | $10.31 | Add to Cart | |
| 24 | 21724 | Spring | 1 | $6.27 | Add to Cart | |
| 25 | 3316295 | Washer | 1 | $4.70 | Add to Cart | |
| 26 | 3316300 | Shift Block Rev | 1 | $82.30 | Add to Cart | |
| 27 | 4301469 | Yoke Bar Rev | 1 | $101.66 | Add to Cart | |
| 28 | 3315897 | Yoke Assy Rev | 1 | $95.85 | Add to Cart | |
| 29 | 3315778 | Shift Block 1ST/2ND | 1 | $63.20 | Add to Cart | |
| 30 | 4304561 | Yoke Bar 1ST/2ND | 1 | Replaces 4303819. | $134.43 | Add to Cart |
| 31 | 3315772 | Yoke Assy 1ST/2ND | 1 | Replaces 3315770. | $107.37 | Add to Cart |
| 32 | 4301471 | Yoke Bar 3RD/4TH | 1 | $49.86 | Add to Cart | |
| 33 | A-6139 | Yoke Assy 3RD/4TH | 1 | Replaces 4301486. | $150.73 | Add to Cart |
| 34 | 1JM6028 | Pin | 6 | $2.24 | Add to Cart | |
| 35 | 1JM3528 | Pin | 6 | $1.78 | Add to Cart | |
| 36 | 4301472 | Yoke Bar 5TH/6TH | 1 | $44.60 | Add to Cart | |
| 37 | A-6138 | Yoke Assy 5TH/6TH | 1 | Replaces 4301488. | $142.96 | Add to Cart |
| 39 | 4301279 | Shift Bar Retainer | 2 | Replaces 3315756. | $18.50 | Add to Cart |
| 40 | 3315757 | Shift Bar Retainer | 1 | $31.20 | Add to Cart | |
| 41 | 233043 | Capscrew | 8 | 3/8"-16X1" | $4.04 | Add to Cart |
| 43 | 227675 | Insert - Yoke Pad | 6 | $7.01 | Add to Cart | |
| 44 | 235052 | Ca Plug | 1 | 9/16 - 18 | $1.50 | Add to Cart |
| 44 | 4303656 | Plug | 1 | Replaces 15917. 9/16 - 18, THREADED | $2.91 | Add to Cart |
| 45 | 15900 | Gasket | 1 | $2.24 | Add to Cart | |
| 46 | X-8-688 | Capscrew | 5 | 3/8"-16X1" | $2.77 | Add to Cart |
| 47 | 238370 | Lifting Eye | 5 | $4.99 | Add to Cart | |
| 999 | S-2861 | Shift Bar Hsg Assy | 1 | Replaces 4303606. COMPLETE REVERSE SWITCH POSITION - RIGHT FRONT | $1,269.02 | Add to Cart |
Eaton Fuller parts & units we stock
Pro Gear and Transmission stocks new, remanufactured and good-used parts for Eaton Fuller transmission units:
- All Eaton Fuller transmission parts & units
- Remanufactured transmissions
- Search our catalog for FS-6406N
Not sure exactly which unit you have? Check our identification guides, or Ask an Expert — send us photos of your data tag and our drivetrain specialists will identify the unit and the exact parts you need. Or call (877) 776-4600.