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Old 11-28-2022, 05:42 AM   #1
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Transmission fluid change

I have a 2005 Winnebago with a 100 Allison trans. Is it really necessary to drain the fluid twice when changing to transynd synthetic. I am sure my 17 year old tranny is out of warranty. It seems to me that the biggest reason to change it twice is to keep the warranty in effect. As I understand the fluids are compatible. Any help will be appreciated.
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Old 11-28-2022, 06:10 AM   #2
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It is not reqd. Only caveat is you need to stay with the shorter change interval until you have done the new Transynd 2X.
Also be aware there is a new Transynd 668 and I'm guessing it is compatible & recommended for the 1000 series. That's what I recently put in my A3000.
I assume you are doing filter change as well?
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Old 11-28-2022, 11:01 AM   #3
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I always have done two drains and replaced the spin-on filter. Used Dexron iii for many years and then switched to Transynd about four years ago.

There are about two quarts left in the transmission that don't drain so doing a drain and refill with about a 20 mile drive in between ensures those get changed too.
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Old 11-28-2022, 11:02 AM   #4
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Quote:
Originally Posted by Winemaker2 View Post
It is not reqd. Only caveat is you need to stay with the shorter change interval until you have done the new Transynd 2X.
Also be aware there is a new Transynd 668 and I'm guessing it is compatible & recommended for the 1000 series. That's what I recently put in my A3000.
I assume you are doing filter change as well?

All correct!
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Old 11-29-2022, 04:00 AM   #5
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Yes I am changing the spin on filter as well, and i am using the transynd 668. Thank you for the info.
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