Wait, you have 74k miles on the original trans fluid and filters?

 

Uh........yes. Do you have more to add? If you know something, i am all ears. I do claim to know anything. I called a reputable transmission shop and this is the advice they gave me.

 

Read pages 5 and 6 -

http://www.allisontransmission.com/servlet/DownloadOnDemand?ApplicationID=155&DownloadID=5

Allison recommends changing the external filter at 10000 miles, the fluid every 50000 miles and the internal filter every 100000 miles. No power flushes are recommended by Allison. Just drain and refill.

 

George,

I appreciate your input and advice. I looked through the standard maintenance for Chevy, but it did not give clear answers. This is why I called the tranny shop.

I will run it to chevy and have them do it and see if they can't figure out why my truck runs so bad and dies too??? I have asked about this here but come up short as no one seems to know?

Thanks, Grant

 

74K is too long to go if you're talking about the spin-on filter, I do mine every other oil change (about 6K) and there is always a little dirty film on the magnet. Internal filter can probably go a long time if you change fluid regularly. I tow a lot and I wouldn't go much beyond 75K between fluid changes, even with Transynd.

 

I appreciate the info. Like I said, when the guy told me to not even worry about it, I was a little perplexed. He gave a pretty thorough explanation, but figured running it by people here may yield more information.

I wanted to do this regardless, but the guy was pretty sincere when he opted against it???

Grant

 

If I were you I would go out and buy some fluid (Dex III) pronto and do a dump/drain/spin-on immediately, then in a few days do another dump and drain.

But thats me.

I do believe the 5 spd Allison you have requires the Dex III, you may have to search whether you can use a Dex VI or not depending on your serial number because Dex VI destroys the seals on certain 5 spd Allisons. Or you could just opt out and get a TES-295 Allison Approved fluid like Transynd or Mobil Delvac.

It won't cost you nearly half of what a dealer or tranny shop will charge you.

The only transmission I never change the fluid on is my Eaton-Fuller 18 speed, which they recommend I never change until overhaul. Makes no sense to me!

 

He is scared of the Allison, happens all the time. He has never worked on one, just find the local service shop for the local school busses and they will fix you right up.

 

That was my first thought until he went into great detail about the Allison! He even named his daughter Allison because he worked on so many.....Don't believe he is scared, but...........

I will have it checked out by the local Big Rig place that works on all my father in laws 18wheelers.

Thanks, Grant

 

You have to change the fluid & filter.
Iv been doing the spin on filter every 15K (part of my scheduled maintenance) & filter/fluid every 50K.