🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Automatic transmission slip — W722 gearbox
💰 Estimated Repair Cost
$150 – $800 USD
Parts and labour estimate
🔧 Tools Required
Transmission fluid, specialist tools for rebuild
📋 Overview
On W115 models fitted with the W722 automatic gearbox, the transmission slips between gears as fluid degrades and internal clutch packs wear. Initial symptoms are delayed engagement and slipping under load.
🩺 Symptoms
- Engine revs rise without corresponding acceleration
- delayed engagement from stop
- slipping under hard acceleration
- fluid discolouration
🔍 Possible Causes
- Worn automatic transmission clutch packs
- degraded transmission fluid
- failed front pump
🛠️ Diagnosis Steps
Check fluid level and condition — burnt smell or dark brown colour confirms degraded fluid. Test engagement from cold and warm.
✅ Most Confirmed Fix
Change transmission fluid and filter as first step. Full rebuild if slipping persists.
62% of users confirm this fix worked (10 reports)
🔗 Other Mercedes-Benz W115 Faults
Own a Mercedes-Benz W115?
Share your experience with this fault — or report a different issue. Your knowledge helps other classic car owners worldwide.