Description
ATRO MS99-63399 polyurethane shifter isolator bushing kit for the Eaton Fuller manual transmission shift tower. Direct replacement for Fuller K3399 (Eaton service kit), used to restore tight, slop-free shift feel on Class 8 trucks running Fuller RT, RTLO, and RTO series transmissions when the OE rubber isolator bushings deflect or fail.
Specifications
| Manufacturer | ATRO Engineered Systems |
|---|---|
| Part Number | MS99-63399 |
| Part Type | Shifter Isolator Bushing Kit |
| Material | Polyurethane (high-durometer) |
| Application | Eaton Fuller manual transmission shift tower |
| High-temp variant | See ATRO MS99-63399-HT for high-temp service |
Kit Includes
- Shifter isolator bushing — qty 1
- Step bushings — qty 2
- Shoulder bolt — qty 1
- Lock nut — qty 1
Cross References
This shifter isolator bushing kit replaces or is equivalent to the following part numbers:
- Eaton Fuller: K3399, 23311, 21244
- Automann: M23311, M23311E, M23311UB, M23311EUB
- Volvo: 85105720, 176640, FULK3399
- Mack: 3088-K3399
- Freightliner: FUL K-3399
- International / Kenworth / Peterbilt: FULK3399
- Dyco: DT1437, DT1438
- GAFF: 11611
Applications
This shifter isolator bushing kit fits Eaton Fuller manual transmissions installed in:
- Eaton Fuller RT, RTO, RTLO 9, 10, 13, 15, and 18-speed transmissions
Representative vehicles using these transmissions:
- Freightliner Cascadia, Columbia, Coronado, Classic XL
- International ProStar, LoneStar, 9000 series
- Kenworth T660, T680, T800, W900
- Mack Granite, Pinnacle, Vision, CH
- Peterbilt 379, 386, 387, 389, 579
- Volvo VNL, VHD, VNX
For high-temperature service near exhaust components, use the ATRO MS99-63399-HT high-temp version.
