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Old 05-09-2021, 03:15 PM   #1
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ALLISON transmission

Hi All,

Lately been noticing transmission slipping into neutral from drive.. not a big problem now, but I donít want it to become one..it doesnít 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 Ďem fly please

Ď09 Alpine 36 FDDS ISL 425 8.9L
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Old 05-09-2021, 03:50 PM   #2
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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.
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Old 05-09-2021, 06:34 PM   #3
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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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Old 07-30-2021, 05:52 PM   #4
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Probably too late but, I'm somewhat of a newbie only having my 2000 36FDS for 3.5 years now. First what the guys say above is correct! Took me 2 yesrs hear and there to get the right level. . Shifted real funny after I changed fluid but when I added more, 2-4 qts at a time Wow it started shifting great. The key pad is your friend. Not the dipstick. Once I got the OL Ok reading on the keypad then I got a chisel and hammered a remarked Full line on the dipstick.
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