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Flushing trans

Steve-Maine

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Steve-Maine Enthusiast

Steve-Maine

Posted
Posted

What is best way to change auto trans. Fluid / I have a 06 2500Hr GMC with Duramax and allison auto.Thanks

hairy mark New Member

hairy mark

Posted
Posted

go buy two gallons of oil from your gm dealer. drain oil in pan. add two gallons of oil back into tranny through dipstick. that is what allison recommends.

GMCDriver1 Enthusiast

GMCDriver1

Posted
Posted

A reputible mechanic or dealer will have the right flushing machine for it. the Allison is safe to flush if done right and flushing will benifit the tranny more then just doing a fluid exchange.

jake111 Enthusiast

jake111

Posted
Posted

At some point 2006 Allison changed seals to be Dex-VI compatible. Before the cutover, Dex-VI may cause the seals to eventually start leaking. GM says there's no problem and will give you Dex-VI if you go to a dealer. Allison says there is a problem and you should use a Dex-III fluid (like Mobil 1 Synthetic ATF that says "for 2005 GM or older" in small print on the back, or check the Mobil wesite, OR better yet, a TES-295 ATF like Transynd or Mobil Delvac ATF but both are only found at semi truck dealers). You can trust Allison or you can trust GM, that's your decision.

 

You'll have to search the 'net for the cutover serial number since you have an '06, and then find your serial number to see if you're Dex-VI safe.

 

Allison recommends drain/fill method. Some passive flush systems are ok to use, but you'd have to find out what machine a shop uses and research that to be sure. A power flush will likely cause big problems later. Again, Allison recommends drain/fill and change the external filter (remembering the magnet).

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

dealers dont have a flush machine unless they want to wallet flush their customers ,,,,,,ive never seen one in any of the dealers i worked at ...

 

they have a cooler flush machine that is an essential tool they have to buy and use during transmission rebuild/replacement

 

no code from machine on warranty w.o = claim denied if audited

radrick Enthusiast

radrick

Posted
Posted

dealers dont have a flush machine unless they want to wallet flush their customers ,,,,,,ive never seen one in any of the dealers i worked at ...

 

they have a cooler flush machine that is an essential tool they have to buy and use during transmission rebuild/replacement

 

no code from machine on warranty w.o = claim denied if audited

Alot of dealers have flush machines now supplied by aftermarket vendors.

radrick Enthusiast

radrick

Posted
Posted

What is best way to change auto trans. Fluid / I have a 06 2500Hr GMC with Duramax and allison auto.Thanks

I would strongly suggest taking your truck to a dealership or reputible trans shop for a flush & spin on filter. The 2 gals of fluid mentioned above will only get the fluid on the converter and the pan. The dealer I used to work at used 4 gal minium on a trans flush.

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