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Old 06-29-2019, 07:29 PM   #1
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allison transmisson service

First transmission service on Duramax with allision transmission. Truck has 55k in mileage and I am getting conflicting stories from repair shops. Some shops want to change filter with flush with price close to $600.00, other shops say do not change the filter with price for service around $300.00. Truck pulls a 41 ft Cedar Creek and I want to do the right service.

Thoughts?
Thank you!
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Old 06-29-2019, 07:35 PM   #2
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I have been told that you NEVER flush an Allison. Filter in pan is usually only changed when doing a rebuild. Buy a spin on filter for $9.00 and 2 gallons of Transynd or equivalent and do it yourself (under $80.total). I change my spin on external filter every other oil change. Remove old, transfer magnet, fill filter with fluid and spin back on.
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Old 06-29-2019, 09:37 PM   #3
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I agree with bob, do it your self under $100 and 30 minutes.
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Old 06-29-2019, 10:19 PM   #4
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Check this out https://dmaxstore.com/products/?rout...&product_id=61

You can also get all kinds of info at any of the Duramax forums.

You can do it yourself for around $100, depending on the fluid you chose. Or take it to a trusted service garage. If you don't have one, the Chevy dealer here charges about $225 for the service with spin on filter.
Allison recommends you don't use a flush machine, but I know folks who do w/o any problems. I wouldn't do it though.
The important thing is to get it done.
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Old 06-29-2019, 10:41 PM   #5
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i have changed mine about every 20k. Drain pan, change spin on filter an add about 7.5 quarts of fluid. Drive truck to bring up to operating temp on tranny and check fluid. Add to bring to full hot on the dipstick.
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Old 06-29-2019, 11:17 PM   #6
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That's a good link that NMWidcat provided. We have an Allison dealer close by so we go there for parts and supplies. Usually cheaper. Seems like you have one near you.
Excel Truck Group
15.5 Miles Away
ALLISON DEALER
4633 Equipment Drive
Charlotte, NC 28269
OEM: Freightliner, Western Star
704-597-1110
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