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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

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Old 10-10-2009, 08:39 PM   #1 (permalink)
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hard shift/ cold weather

ok when its cold out and my allison isnt warmed up it shifts super hard , up or down shift, it is expesically when it downshifting 2-1 while slowing down it will actually kick in the abs for a second , but if i put it in tow/hual is seem to not downshift as hard, and when speeding up 1-2 it will shift hard or sometimes shift good even warm or cold what could be the problem? and the atf smells burnt to me is that normal? or are my bands burnt up?

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Old 10-15-2009, 08:03 PM   #2 (permalink)
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if ATF smells burnts you probably have a problem.

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Old 10-21-2009, 11:07 AM   #3 (permalink)
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what if I have that problem and it's not burnt? Also I just changed my Edge Evo from 4 down to 3. Is the tranny re-learning?
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Old 10-21-2009, 11:20 AM   #4 (permalink)
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I would make sure and change the fluid and filter if it smells burned first. The Allison are knowen for shifting firm with cold fluid temperatures. Transynd fluid seems to help the issue in cold climates and is good in warm as well.

Last edited by Diesel Tech; 10-21-2009 at 11:21 AM.
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Old 10-21-2009, 11:35 AM   #5 (permalink)
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I would also recommend changing out your fluid and filter and keep your foot out of it for a while (I personally would do the "hoot" method to make sure to get most of the old stuff out)- Have you ever changed it before, or will this be a first? Also, how many miles are on the truck? If it hasn't been changed before (or for a long time), it may just be WAY overdue. Also, if you switch to a synthetic transmission fluid your shifts will smooth out a little bit in the cold, as well as over all. I would recommend going with Torque Drive from Amsoil. If I can help you out with that, PM me and I would be more than happy to help you out and get you a quote!!!
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Old 11-06-2009, 12:51 AM   #6 (permalink)
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I have 55K on my truck and it does the same thing. It is pretty random when it does it and it seems to only do it when the tranny is still cool.

It is a pretty hard shift and sounds bad too.
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