Eaton Fuller FO-8406A-ASX Parts Manual
This is the Eaton Fuller Illustrated Parts List covering the FO-8406A-ASX transmission. Use it to identify every serviceable part in your unit — assemblies, gears, shafts, housings and seals — before you order replacements.
| Models covered | FO-8406A-ASX |
| Transmission type | 6-speed, twin-countershaft, heavy duty |
| Document | Illustrated Parts List (Eaton Fuller) |
| Length | 23 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 FO-8406A-ASX — every part in the manual, matched to our live inventory. We stock 163 of the 179 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 Controller Ecu & Harness Countershaft Assy Gear Display Module Inertia Brake Assembly Input Shaft Kits & Assemblies Mainshaft Assy Miscellaneous Reverse Idler Gear Assy Shift Bar Housing Shift Control X-Y Shifter Module
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 | A-7037 | Case Assy | 1 | Replaces 691411. | $1,310.03 | Add to Cart |
| 3 | 4300301 | FITTING-45 Degree | 2 | Replaces 11H15. | $5.45 | Add to Cart |
| 4 | 201398 | Pto Cover | 1 | $9.08 | Add to Cart | |
| 5 | 12815 | Bushing | 4 | $5.26 | Add to Cart | |
| 6 | 239613 | Capscrew | 6 | 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 | |
| 9 | 4305309 | Gasket | 1 | Replaces 1684. | $8.58 | Add to Cart |
| 10 | X-8L-408 | Screw & Washer Assy | 2 | $1.79 | Add to Cart | |
| 11 | X-3-1000 | Lockwasher | 4 | 5/8" | $1.69 | Add to Cart |
| 12 | X-8-1011 | Capscrew | 4 | Replaces 1C1036. 5/8"-11X2-1/4" | $3.64 | Add to Cart |
| 15 | 3315659 | Gasket | 1 | $2.58 | Add to Cart | |
| 16 | 4300888 | Front Brg Cover-pull | 1 | $203.38 | Add to Cart | |
| 16 | 4302356 | Front Brg Cover-pull | 1 | $125.76 | Add to Cart | |
| 17 | 4300121 | Oil Seal | 1 | Replaces 3315623. SHAFT 1.873, WIDTH .375, OD 2.68 | $9.12 | Add to Cart |
| 18 | 239614 | Screw | 6 | 5/16-18X.81 | $7.31 | Add to Cart |
| 21 | 3315681 | Shim .004 | 1 | $3.01 | Add to Cart | |
| 21 | 3315682 | Shim .007 | 1 | $2.24 | Add to Cart | |
| 21 | 3315683 | Shim .010 | 1 | $3.06 | Add to Cart | |
| 21 | 3315684 | Shim .020 | 1 | $3.74 | Add to Cart | |
| 21 | 4300977 | Shim .040 | 1 | $3.34 | Add to Cart | |
| 23 | X-12-1209 | Pipe Plug | 1 | $8.05 | Add to Cart | |
| 24 | X-12-1207 | Pipe Plug | 1 | Replaces X121202, X121206. 3/4" MAGNETIC | $4.53 | Add to Cart |
| 27 | 4301607 | C/s Rear Brg Cover | 1 | $72.73 | Add to Cart | |
| 30 | 3316160 | Speedo Rotor | 1 | 16 TEETH | $71.38 | Add to Cart |
| 31 | 711123 | Bearing Cup | 1 | — | Call for availability | |
| 32 | 3315662 | Shim .004 | 1 | $5.74 | Add to Cart | |
| 32 | 3315663 | Shim .007 | 1 | $6.73 | Add to Cart | |
| 32 | 3315664 | Shim .010 | 1 | $3.71 | Add to Cart | |
| 32 | 3315665 | Shim .020 | 1 | $5.51 | Add to Cart | |
| 32 | 4300978 | Shim .040 | 1 | $12.31 | Add to Cart | |
| 33 | S-2864 | Rear Brg Cover Assy | 1 | Replaces 691423, 691666. | $199.83 | Add to Cart |
| 34 | 4300119 | Oil Seal | 1 | SHAFT 2.753, WIDTH .5 | $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 | 2 | $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 | |
| 53 | K-3231 | Speed Sensor Kit | 1 | Replaces A-6398, A-6724. SINGLE PICK-UP (2 PIN) | — | Call for availability |
| 54 | X-8C-409 | Capscrew | 1 | 1/4"-20X5/8" | $1.87 | Add to Cart |
| 55 | 14142 | O-ring | 1 | $1.96 | Add to Cart | |
| 56 | K-3125 | Speedo Plug Kit | 2 | Replaces 4302707. | $5.13 | Add to Cart |
| 57 | X-8C-409 | Capscrew | 2 | 1/4"-20X5/8" | $1.87 | Add to Cart |
Controller Ecu & Harness
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | K-3525 | Transmission | 1 | Replaces 691667. | $156.68 | Add to Cart |
| 2 | A-7023 | Ecu Mtg Bracket Assy | 1 | Replaces 691428, 691527. | $29.07 | Add to Cart |
| 3 | 4301367 | Mounting Pad | 4 | $7.89 | Add to Cart | |
| 4 | 691528 | Ecu Mounting Spacer | 2 | — | Call for availability | |
| 5 | K-3435RX | Reman Exchange Transmission Controller Kit | 1 | Replaces A-6991, K-3435, K-3435R. | $3,863.69 | Add to Cart |
| 6 | 4301369 | Sleeve | 2 | $22.94 | Add to Cart | |
| 7 | 4302114 | Washer | 2 | $2.82 | Add to Cart | |
| 8 | X-8-558 | Capscrew | 2 | $1.86 | Add to Cart | |
| 10 | X-8-688 | Capscrew | 2 | 3/8"-16X1" | $2.77 | 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-3795 | Countershaft Brg Kit | 1 | Replaces 1313645, 791943. | $34.45 | Add to Cart |
| 5 | 3315752 | Snap Ring | 1 | Replaces 3315751. | $5.01 | Add to Cart |
| 6 | 4304541 | Drive Gear-cntrshft | 1 | $244.37 | Add to Cart | |
| 7 | 4304542 | 5TH Gear-cntrshft | 1 | $176.43 | Add to Cart | |
| 8 | 4304097 | 4TH Gear-cntrshft | 1 | Replaces 4304099. | $114.39 | Add to Cart |
| 9 | 4304056 | 3RD Gear-cntrshft | 1 | Replaces 4304062. | $127.86 | Add to Cart |
| 10 | 230292 | Key | 2 | $4.27 | Add to Cart | |
| 11 | 4303238 | Countershaft | 1 | Replaces 3315740. | $590.37 | Add to Cart |
| 12 | 658981 | Bearing Cone | 1 | — | Call for availability | |
| 13 | 660181 | Bearing Cup | 1 | — | Call for availability |
Gear Display Module
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | K-3199 | Gear Display Kit | 1 | Replaces 4301944, A-6416. | $516.96 | Add to Cart |
Inertia Brake Assembly
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | K-3648 | Inertia Brake Kit | 1 | Replaces A-7434, K-3508, A-7828. | $3,340.11 | Add to Cart |
| 2 | X-8C-409 | Capscrew | 1 | 1/4"-20X5/8" | $1.87 | Add to Cart |
| 3 | X-8C-690 | Capscrew | 6 | $4.23 | Add to Cart | |
| 4 | 4303677 | Elbow | 1 | $52.01 | Add to Cart | |
| 5 | 5588205 | Oil Hose Assy (13.5") | 1 | Replaces 5586911, 5586922. 13.5" | — | Call for availability |
| 6 | 691651 | Elbow, 90 Deg Male | 1 | $13.37 | Add to Cart | |
| 7 | 691517 | Filter Fitting | 1 | $34.29 | Add to Cart | |
| 8 | 4305309 | Gasket | 2 | Replaces 1684. | $8.58 | Add to Cart |
| 9 | K-3231 | Speed Sensor Kit | 1 | Replaces A-6398, A-6724. SINGLE PICK-UP (2 PIN) | — | Call for availability |
| 10 | 691519 | Plate-adapter 6 Bolt Pto | 1 | — | Call for availability | |
| 11 | K-3638 | I-brake Connector Kit | 1 | Replaces 691499. | — | No longer available — call for replacement |
Input Shaft
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | 675250 | Bearing Cup | 1 | 1.75" INPUT | — | Call for availability |
| 2 | 742259 | Bearing Cone | 1 | 1.75" INPUT | — | Call for availability |
| 3 | 4304540 | Input SHAFT-1.75" Pull | 1 | PILOT 25MM - USE 4300888 OR 4302356 FRONT BEARING COVER | $282.35 | Add to Cart |
Kits & Assemblies
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| K-2183 | Shim Kit | 1 | $65.70 | Add to Cart | ||
| K-3125 | Speedo Plug Kit | 1 | Replaces 4302707. | $5.13 | Add to Cart | |
| K-3199 | Gear Display Kit | 1 | Replaces 4301944, A-6416. | $516.96 | Add to Cart | |
| K-3231 | Speed Sensor Kit | 1 | Replaces A-6398, A-6724. SINGLE PICK-UP (2 PIN) | — | Call for availability | |
| K-3411 | Nut Kit | 1 | Replaces 21937, 4301920, 4304690. | $34.14 | Add to Cart | |
| K-3422 | Small Parts Kit | 1 | $132.86 | Add to Cart | ||
| K-3435RX | Reman Exchange Transmission Controller Kit | 1 | Replaces A-6991, K-3435, K-3435R. | $3,863.69 | Add to Cart | |
| K-3436 | Xy Shifter Kit | 1 | Replaces 691381, A-7034. | $2,443.44 | Add to Cart | |
| K-3438 | Position Sensor Kit | 1 | Replaces 691551, 691926. | $117.41 | Add to Cart | |
| K-3440 | Basic Rebuild Kit | 1 | $919.86 | Add to Cart | ||
| K-3525 | Transmission Harness Kit | 1 | Replaces 691667. | $156.68 | Add to Cart | |
| K-3528 | Reverse Idler Gear Kit | 1 | Replaces 4301491. | $116.75 | Add to Cart | |
| K-3638 | I-brake Connector Kit | 1 | Replaces 691499. | — | No longer available — call for replacement | |
| K-3648 | Inertia Brake Kit | 1 | Replaces A-7434, K-3508. | $3,340.11 | Add to Cart | |
| K-3795 | Countershaft Brg Kit | 1 | Replaces 1313645, 791943. | $34.45 | Add to Cart | |
| K-7028 | Gasket Kit | 1 | $17.54 | Add to Cart | ||
| S-2864 | Rear Brg Cover Assy | 1 | Replaces 691423, 691666. | $199.83 | Add to Cart | |
| S-2865 | Shift Bar Housing Assy | 1 | Replaces 691655, A-7053. | $711.60 | Add to Cart | |
| S-2989 | Pushbutton Assembly | 1 | Replaces S-2985. | — | Call for availability |
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 | |
| 6 | 691415 | Sliding Clutch (5TH/6TH) | 1 | $93.24 | Add to Cart | |
| 7 | 4301476 | Clutch Hub 5/6 | 1 | $48.99 | Add to Cart | |
| 8 | 4304543 | 5TH Gear-mainshaft | 1 | $192.24 | 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 | 4304098 | 4TH Gear-mainshaft | 1 | Replaces 4304401. | $219.90 | Add to Cart |
| 13 | 4124075 | Bearing | 4 | $34.53 | Add to Cart | |
| 15 | 3315725 | Snap Ring | 2 | $3.33 | Add to Cart | |
| 16 | 691414 | Sliding Clutch (3RD/4TH) | 1 | $163.83 | Add to Cart | |
| 17 | 4301475 | Clutch Hub 3/4 | 1 | $36.51 | Add to Cart | |
| 18 | 4304057 | 3RD Gear-mainshaft | 1 | Replaces 4304063. | $191.71 | 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 | 4303231 | 2ND Gear-mainshaft | 1 | Replaces 4301482. | $261.34 | Add to Cart |
| 23 | 4301852 | Sliding Clutch 1ST/REV | 1 | $115.37 | Add to Cart | |
| 24 | 4303230 | 1ST Gear-mainshaft | 1 | Replaces 4301483. | $319.72 | Add to Cart |
| 25 | 4301484 | Reverse Gear- Mainshaft | 1 | $248.77 | Add to Cart | |
| 26 | 4301474 | Clutch Hub-rev | 1 | $42.60 | Add to Cart | |
| 27 | 4301473 | Sliding Clutch-rev | 1 | $101.13 | 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 | 4301468 | Mainshaft | 1 | $465.65 | Add to Cart | |
| 34 | 4301492 | Washer | 1 | $20.56 | Add to Cart | |
| 35 | 5557003 | Bearing Cone | 1 | — | Call for availability |
Miscellaneous
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 71203 | Silicone Lube | 1 | 8 OZ (236.59 CC)-FLEET SIZE | $46.48 | Add to Cart | |
| 71204 | Adhesive Sealant | 1 | 0.5 CC (SINGLE APPLICATION SIZE) | $10.64 | Add to Cart | |
| 71205 | Sealant | 1 | 2 CC (SINGLE APPLICATION SIZE) | $10.82 | Add to Cart | |
| 71206 | Silicone Lube | 1 | 4 CC (SINGLE APPLICATION SIZE) | $4.23 | Add to Cart | |
| 71231 | Gasket Sealant | 1 | 8 MILLILITER SIZE | $33.25 | Add to Cart | |
| 71232 | Thread Adhesive | 1 | 10 MILLILITER SIZE | $28.73 | 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 | |
|---|---|---|---|---|---|---|
| 14 | 3315673 | Washer | 2 | $24.98 | Add to Cart | |
| 15 | 3315674 | Bearing | 2 | $19.40 | Add to Cart | |
| 16 | 3315676 | Spacer | 1 | $22.06 | Add to Cart | |
| 17 | K-3528 | Reverse Idler Gear Kit | 1 | Replaces 4301491. | $116.75 | 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 | S-2865 | Shift Bar Housing | 1 | Replaces 691655, A-7053. | $711.60 | 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 | 691644 | Spring | 4 | $5.01 | 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 | |
| 26 | 691526 | Shift Block - Reverse | 1 | $89.99 | Add to Cart | |
| 27 | 691654 | Yoke Bar - Reverse | 1 | Replaces 691422. | $80.45 | Add to Cart |
| 28 | 3315897 | Shift Yoke Assy | 1 | $95.85 | Add to Cart | |
| 29 | 691522 | Shift Block (1ST/2ND) | 1 | $43.68 | Add to Cart | |
| 30 | 691419 | Yoke Bar (1ST/2ND) | 1 | $32.75 | Add to Cart | |
| 31 | 3315772 | Shift Yoke Assy | 1 | Replaces 3315770. | $107.37 | Add to Cart |
| 32 | 691420 | Yoke Bar (3RD/4TH) | 1 | $24.67 | Add to Cart | |
| 33 | A-7038 | Yoke Assy (3RD/4TH) | 1 | Replaces 691524. | $111.01 | Add to Cart |
| 34 | 1JM6028 | Pin | 6 | $2.24 | Add to Cart | |
| 35 | 1JM3528 | Pin | 6 | $1.78 | Add to Cart | |
| 36 | 691421 | Yoke Bar (5TH/6TH) | 1 | $23.99 | Add to Cart | |
| 37 | A-7039 | Yoke Assy (5TH/6TH) | 1 | Replaces 691525. | $118.80 | 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 | 3 | 3/8"-16X1" | $2.77 | Add to Cart |
| 47 | 238370 | Lifting Eye | 3 | $4.99 | Add to Cart | |
| 999 | S-2865 | Shift Bar Housing Assy | 1 | Replaces 691655, A-7053. | $711.60 | Add to Cart |
Shift Control
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | S-2989 | Pushbutton Assembly | 1 | Replaces S-2985. | — | Call for availability |
X-Y Shifter Module
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | K-3436 | Xy Shifter Kit | 1 | Replaces 691381, A-7034. | $2,443.44 | Add to Cart |
| 2 | 4305452 | Gasket | 1 | Replaces 4301958. | $11.02 | Add to Cart |
| 3 | K-3438 | Position Sensor Kit | 2 | Replaces 691551, 691926. | $117.41 | Add to Cart |
| 4 | X-8C-615 | Capscrew | 4 | $10.25 | Add to Cart | |
| 5 | 4304602 | Breather | 1 | Replaces 23605. 1/4" NPT | $8.22 | Add to Cart |
| 6 | 5559348 | Ty-rap | 5 | $2.40 | Add to Cart | |
| 7 | K-4009 | Xy Shifter Repair Kit | 1 | $17.59 | 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 FO-8406A-ASX
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.