Allison slipping? - Page 2 - Chevy and GMC Duramax Diesel Forum
Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

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Old 06-18-2010, 09:15 PM   eBay Motors  #11 (permalink)
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When did you last replace your fuel filter?
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Old 06-18-2010, 09:29 PM   eBay Motors  #12 (permalink)
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About 1000 miles ago. Change fuel filter every 10k.
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09 2500 CCSB / Black granite metallic|-|SDP Twins (Metallic Blue)|-|30% Injectors|-|ARP Head Studs|-|SoCal Pushrods|-|EFI Live Tuned By MCS Diesel|-|PPE Stage V trans|-|FASS Platinum 95gph|-| 5" Turbo back Magnaflow|-|Triple pillar gauge/Cobalt (Boost-Pyro-Rail)|-|Kryptonite Center link|-|Kryptonite Tie Rods|-|Cognito PISK|-|

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Old 06-18-2010, 09:56 PM   eBay Motors  #13 (permalink)
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Have you done a transmission relearn after the H&S? This almost sounds like the trans hasn't learned yet... How long ago snce you installed the tuner.

I very highly doubt your trans is on it's way out.
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Last edited by cainer70; 06-18-2010 at 09:58 PM.
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Old 06-19-2010, 07:58 AM   eBay Motors  #14 (permalink)
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Ya, I did a relearn about a day after I put it on the truck which was about 3-4 weeks ago.

When I would start to accelerate from a stop it shifts great, its just when I would get on it pretty good at about 55-60mph, it felt like i was taking my foot off the pedal then getting back on it really quick. the truck would lay down for a split second then start to accelerate again and would keep doing this numerous times in a row.

From what I have read if you limp your trans you will get a code and only run in 3rd gear, or did I read that wrong?

Im having a hard time describing it so sorry about the weird explanations.
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09 2500 CCSB / Black granite metallic|-|SDP Twins (Metallic Blue)|-|30% Injectors|-|ARP Head Studs|-|SoCal Pushrods|-|EFI Live Tuned By MCS Diesel|-|PPE Stage V trans|-|FASS Platinum 95gph|-| 5" Turbo back Magnaflow|-|Triple pillar gauge/Cobalt (Boost-Pyro-Rail)|-|Kryptonite Center link|-|Kryptonite Tie Rods|-|Cognito PISK|-|

Cognito UCA + keys|-|20" XD Spy|-|Nitto Dune Grappler 305/55/20|-|HID 8k Lows, 8k Highs, 3k Fogs|-|Air Lift 5000 air bags|-|

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Old 06-19-2010, 09:21 AM   eBay Motors  #15 (permalink)
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if you are describing a short pause type event happening you may be experiencing defuel between shifts.
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Old 07-09-2010, 06:12 PM   eBay Motors  #16 (permalink)
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I just installed a ppe standard level 3 on my 06 lbz... i never noticed any shifting problems when it was stock. Now i notice the same lagging shifting problems. Could this be the extra power has just made it noticeable, and its just a fuel filter/pressure drop problem?
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Old 07-09-2010, 06:29 PM   eBay Motors  #17 (permalink)
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it is called defueling, it does it between shifts to save the transmission, if you take defuel off a stock trans it wont last very long!!!
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Old 07-09-2010, 07:32 PM   eBay Motors  #18 (permalink)
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The problem really only occurs when I get on it somewhat but normal driving the problem doesn't occur. Im going with a built trans and lift pump here in the next couple months so hopefully this will fix the problem running on any tune.
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09 2500 CCSB / Black granite metallic|-|SDP Twins (Metallic Blue)|-|30% Injectors|-|ARP Head Studs|-|SoCal Pushrods|-|EFI Live Tuned By MCS Diesel|-|PPE Stage V trans|-|FASS Platinum 95gph|-| 5" Turbo back Magnaflow|-|Triple pillar gauge/Cobalt (Boost-Pyro-Rail)|-|Kryptonite Center link|-|Kryptonite Tie Rods|-|Cognito PISK|-|

Cognito UCA + keys|-|20" XD Spy|-|Nitto Dune Grappler 305/55/20|-|HID 8k Lows, 8k Highs, 3k Fogs|-|Air Lift 5000 air bags|-|
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Old 07-10-2010, 10:18 AM   eBay Motors  #19 (permalink)
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your not hitting limp mode,im pretty sure a code definatly is thrown when it hits limp mode.and you cant go very fast at all when ur in limp mode,i think you can only go like 35?..you have to shut the truck off i belive and reset the code and it will be fine after that.but that means once you limp it,you put a glaze on the clutches.therefore it will only be easier and easier to limp when u hammer on it.It doesnt sound like you have limped it,there are ppl on here running pretty big tunes and hammer down alot and havnt limped there trans yet.probably de-fueling like said.
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