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AX4S neutrals out 4th
Posted to Transmission Forum on 3/9/2018 26 Replies

Unknown history. Radiator cooler went and contaminated AT Fas towedin to us. We did a new radiator and transmission rebuild. Transmission wasn't too bad. All rubber and frictions replaced, solenoids left alone. A Sonnax boost valve was added, as usual. Front planet was found to have some bad teeth. A good used one was used. Works fine except neutrals out in 4th. Torn back down. Nothing found. 4th band, servo, and shell swapped even though no issue found. Direct sprag swapped out too (we have some AX4s parts around). Band and other air checks fine. Solenoids check OK but swapped around anyway. 3-4 accuumulator checks OK. New and old planets were compared very carefully. Can't find anything and back together again nothing has changed. Pressures are all good. 1-2-3 and R are all just fine. I'm out of ideas. It's fully together and on a lift right now.

Ben Hammon
Technician
SAT Automotive
Chesnee, South Carolina, USA

26 Replies Received (View Replies)