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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,596
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any Allison transmission experts on here ?
Background: 2001 GMC diesel dually 4X4 purchased used with 100K on the clock now has 165K . I have not changed the transmission fluid or filter since I purchased but it was changed by the dealer when I purchased it . Been reliable as a stove with no issues .
A few months ago it developed a random shifting quirk on 1-2 + 2-1 shifts that would be a little harsh . It was/is totally random and sometimes does it and sometimes doesn't . Does not seem to be temperature related as it sometimes does it cold and sometimes hot . And most of the time not at all . So a few weeks ago I drained the transmission pan and replaced with DEX fluid and a new spin on filter . The old fluid that came out was red in color not brown or black . Smelled great with no hint of burning . With the new fluid/filter it acts the same way . I know I only replaced about 50 % of the fluid capacity but am planning another drain/filter/refill within 5,000 miles or so . This is the 5 speed Allison and I have read online there are new GM flash software updates , does this sound like a software type of issue ? It almost feels like a solenoid timing is off or is partially hanging up . I know these transmissions like Transynd fluid but I was holding off spending on that fluid to make sure I'm not losing the transmission . All other shifts are perfectly smooth . The tow/haul portion seems to work just fine with all shifts being crisper and holding RPM longer as it should . So what is my next step in diagnosis ? I have no check engine lights but I guess I can plug in my OBD reader and see if anything comes up .
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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12-04-2017, 05:00 AM
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(the shotguns)
Join Date: Feb 2006
Location: Maryland
Posts: 21,597
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I am not but thought I might warn you ahead of time I've picked up viruses from GM truck forums. Surf carefully.
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***************************************** Well i had #6 adjusted perfectly but then just before i tightened it a butterfly in Zimbabwe farted and now i have to start all over again! I believe we all make mistakes but I will not validate your poor choices and/or perversions and subsidize the results your actions. |
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12-04-2017, 05:04 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Which model trans is in your truck?
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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12-04-2017, 06:05 AM
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The Unsettler
Join Date: Dec 2002
Location: Lantanna TX
Posts: 23,885
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Try resetting Transmission Control Module.
Google for your year / make but generally involves not much beyond disconnecting it's hot lead for a few minutes.
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"I want my two dollars" "Goodbye and thanks for the fish" "Proud Member and Supporter of the YWL" "Brandon Won" |
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12-04-2017, 06:27 AM
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Registered
Join Date: Jul 2003
Location: Valencia Pa.
Posts: 8,847
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04, duramax, 5 speed allison. I get the same thing sometimes. I have been running a tuner, and recently starting driving it stock again, and it does it much less frequently and severe, but I still noticed a hard 1-2 upshift last weekend.
Ill look, and see if there is a bulletin, or software update later today for you. I was going to look in to it myself anyhow. Pretty minor on my truck anyhow, and I baby the thing so I have always sort of thought of it as more of a nuisance, than a problem. My filters are clean, fluid new, as well. Started rearing its face right about 150k. Trans is flawless in every other way.
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No left turn un stoned |
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12-04-2017, 06:33 AM
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Registered
Join Date: Mar 2004
Location: Los Angeles
Posts: 17,359
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Hey Freddy, do you know if its ok to use tranny fluid in that power steering? I have looked but have gotten nowhere. How many quarts of oil is need for that? sorry for going sidetrack OP. Many thanks
Jeff |
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12-04-2017, 07:51 AM
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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,596
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Quote:
__________________
2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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12-04-2017, 01:24 PM
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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,596
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Quote:
__________________
2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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12-04-2017, 01:26 PM
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