The MR's 6-speed is weaker than the 5-speed under high power
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What causes "The MR's 6-speed is weaker than the 5-speed under high power" on the Mitsubishi Lancer Evolution VIII (2003-2005), and how is it fixed?
One retailer says the 6-speed suits stock or near-stock daily drivers but is considerably weaker than the 5-speed used in all other VIIIs and IXs. Fix: For high power, the retailer suggests swapping in a 5-speed (see F-evo-16).
Symptoms
Gearbox damage on modified, high-power MRs.
Cause
One retailer says the 6-speed suits stock or near-stock daily drivers but is considerably weaker than the 5-speed used in all other VIIIs and IXs.
Fix (summary)
For high power, the retailer suggests swapping in a 5-speed (see F-evo-16). Single retailer source.
Related parts
Other CT9A (Evolution VIII) problems
- Recall 04V-138: wrong weight ratings on the certification label (2003)
- Recall 05V-335: turbocharger coolant hose may leak (2005)
- Recall 16V-458: front crossmember corrosion can let the lower arms detach (salt states)
- 5-speed gearbox grinds as the brass synchro rings wear
- Plastic boost bypass valve leaks with age
More for this car
- All Mitsubishi Lancer Evolution VIII (2003-2005) fitment answers · CT9A (Evolution VIII) common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- USDM EVO 8/9 Year To Year Changes — Wunderladen Racing (vendor article; read 2026-10-26; full page read)6-speed considerably weaker than the 5-speed; 5-speed swaps in relatively easily.
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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