397978R2
Gear shift and torque amplifier lever knob for International Harvester 756, 766, 826, 856 and 18 more
Original part (OEM)
Not checked yet
PorkForge replacement
Not made yet
Part facts
- Original part number
- 397978R2R1
- Manufacturer
- International Harvester (Farmall)
- Part type
- Knobs · Control knobs and handles
- System
- Operator controls
- Notes
- Lever knob that Precision Tractor Parts lists for the gear shift, torque amplifier and transmission levers of the 56 and 66 series and the early 86 series, with serial cut-offs for the 886, 986, 1086, 1486 and 1586. It sells as a reproduction for $17. In 2021 Red Power members 3D-printed shift knobs for an 86-series 1486 and others asked for a pair, which shows interest in printed knobs for this family, though that thread gave no part number.
- Last reviewed
- Oct 27, 2026 · record pf-ih-0005
Dimensions How to measure this part
Fits these machines
| Model | Years | Notes | Evidence |
|---|---|---|---|
| International Harvester 756 | Not recorded | — | Reported 1 |
| International Harvester 766 | Not recorded | — | Reported 1 |
| International Harvester 826 | Not recorded | — | Reported 1 |
| International Harvester 856 | Not recorded | — | Reported 1 |
| International Harvester 966 | Not recorded | — | Reported 1 |
| International Harvester 1066 | Not recorded | — | Reported 1 |
| International Harvester 1256 | Not recorded | — | Reported 1 |
| International Harvester 1456 | Not recorded | — | Reported 1 |
| International Harvester 1466 | Not recorded | — | Reported 1 |
| International Harvester 1468 | Not recorded | — | Reported 1 |
| International Harvester 1566 | Not recorded | — | Reported 1 |
| International Harvester 1568 | Not recorded | — | Reported 1 |
| International Harvester 4568 | Not recorded | — | Reported 1 |
| International Harvester 4586 | Not recorded | — | Reported 1 |
| International Harvester 1086 | Not recorded | Seller: up to SN 47999. | Reported 1 |
| International Harvester 1486 | Not recorded | Seller: up to SN 25999. | Reported 1 |
| International Harvester 1586 | Not recorded | Seller: up to SN 20999. | Reported 1 |
| International Harvester 886 | Not recorded | Seller: up to SN 16999. | Reported 1 |
| International Harvester 986 | Not recorded | Seller: up to SN 23999. | Reported 1 |
| International Harvester 3388 | Not recorded | Seller: up to SN 10384. | Reported 1 |
| International Harvester 3588 | Not recorded | Seller: up to SN 12729. | Reported 1 |
| International Harvester 4386 | Not recorded | Seller: SN 2501 and up. | Reported 1 |
Where to find one today
| Source | Condition | Price | Stock | Checked |
|---|---|---|---|---|
| Precision Tractor Parts 1 | Reproduction | $17.00 | Not stated | Oct 27, 2026 |
Why it is hard to get
- Forum request: Sept 2021: members 3D-printed shift knobs for a 1486 and another asked for a pair for his 1486. No part number given, so the link to 397978R2 is unconfirmed. 2
Can this part be made again?
EligiblePhysical replacement
Hand knob on shift levers; not structural. Bore or thread and any pattern insert unmeasured.
Candidate materials: PETG, ASA (other fabricator, better UV resistance) (confirmed by test-fitting).
EligibleSTL / FreeCAD file
Can be offered as a printable file and an editable FreeCAD model once the measurements are verified.
Sources
- Precision Tractor Parts: Fasteners, Attachments & Miscellaneous (category page)
- Red Power Magazine forum: Replacement shifter knobs (2021, 86 series)
Not affiliated with or endorsed by International Harvester or its successors. The name is used only to identify compatibility. Part numbers are shown for reference. Check fit against your own machine. Spot a mistake?
Verification checklist (3 of 8 met)
- ✕ OEM part number not yet verified from an OEM or dealer source
- ✓ Cited by two websites, or by an OEM or dealer source
- ✓ At least one compatible model with a source
- ✕ 1 kinds of fact beyond the name (aftermarket prices); 3 needed
- ✕ Original availability not yet checked
- ✓ Text and title are distinct
- ✕ On hold: Cites precisiontractorparts.com, whose robots.txt now blocks AI crawlers; re-source or verify by hand
- ✕ Not yet reviewed and signed off for search
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