Product Overview
The A-6608 Transmission Synchronizer Assembly is supplied as a new independent aftermarket replacement for professional transmission repair. This assembly addresses the upper 5th/6th shift range and is configured with 54 teeth for compatible FS-6406A service. Reference part number A-6608 is provided to support part-to-part comparison, not as a substitute for application verification.
Its synchronizing surfaces assist with speed matching as the driver selects either of the two upper gears. The specified position is 5th / 6th, with Tooth Count: 54. These details should be checked against the removed component and the transmission build information before purchase.
Key Features
- New independent aftermarket replacement for transmission rebuilding.
- Distinct 54-tooth design for the 5th/6th synchronizer location.
- Reference part number A-6608 supports accurate cross-checking.
- Professional installation and inspection of mating components are recommended.
Product Specifications
| Reference Part Number | A-6608 |
|---|---|
| Product Type | Transmission Synchronizer Assembly |
| Condition | New |
| Replacement Type | Independent Aftermarket Replacement |
| Component Position | 5th / 6th |
| Tooth Count | 54 |
| Transmission Application Reference | FS-6406A |
Application and Ordering
Check that the transmission is an applicable FS-6406A unit and that the removed synchronizer comes from 5th/6th. Count the teeth and compare splines, groove layout, hub width, sleeve profile, and overall dimensions. Application lists can include variations by build date, ratio, housing, or internal configuration. If any detail differs, request a dimensional check before ordering. Installation should be performed by a qualified transmission technician, with mating parts, bearings, lubrication paths, and adjustment settings inspected during assembly.
Frequently Asked Questions
Is A-6608 a genuine branded part?
No. This is an independent aftermarket replacement compatible with selected Eaton / Fuller applications. These names and reference numbers are used solely for identification and compatibility comparison; no affiliation, authorization, sponsorship, or endorsement is claimed.
What should be checked before ordering A-6608?
Confirm the exact transmission model and compare the reference number, component position, tooth count, dimensions, spline or tooth details, and physical configuration with the removed part.
Why is the 54-tooth count important for A-6608?
The tooth count is a primary identification detail that helps distinguish this 5th/6th synchronizer from visually similar assemblies.
Compatibility and IP Notice
All third-party brand names, model designations, logos, and part numbers are the property of their respective owners. They are used solely for identification and compatibility reference. This independently supplied aftermarket replacement is not an OEM or genuine branded product and is not manufactured, authorized, licensed, sponsored, affiliated with, or endorsed by any referenced trademark owner.
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