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scorpodoc 05-09-2021 03:15 PM

ALLISON transmission
Hi All,

Lately been noticing transmission slipping into neutral from drive.. not a big problem now, but I don’t want it to become doesn’t matter if engine break is on high or low but it seems To happen more often when slowing down.. T-oil check is fine and no leaks noted.. thinking of getting it checked out but if there are any other suggestions let ‘em fly please

‘09 Alpine 36 FDDS ISL 425 8.9L

wolfe10 05-09-2021 03:50 PM

Do three things IMMEDIATELY:

Using the Allison shift pad, check for DIAGNOSTIC CODES.

Visually check transmission fluid (dip stick for any sign of contamination).

Send off transmission fluid sample for analysis.

LOTS cheaper than a transmission rebuild/replacement.

Old Scout 05-09-2021 06:34 PM

Curious--how did you verify that "T-fluid level was OK"--dip-stick or key pad with engine/tranny at ops temp? When was fluid/filter last changed? Coolant is a likely contaminant but not really sure what symptoms of contamination would be? Focus on proper fluid level first.

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