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Old 02-02-2012, 07:21 PM
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2004 Denali 6.0, trans slips when cold

I have a 2004 denali 6.0 and the flipping transmission slips between 1st and 2nd and 3rd when cold and only under light throttle. If I use a heavy foot it doesn't slip at all even when cold.
A 15 minuter run and the tranny warms up with no slipping at all even under light throttle.
The oil is clean and clear with no smell at all and I change the filter every spring.
I hate the thoughts of taking it in to the mechanic since it's always a rebuild and never just fix the problem for a reasonable price.
I am an aircraft mechanic and can easily fix this thing with some decent input of what i'm looking at or for !
What a pain !!!!

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Old 02-02-2012, 08:53 PM
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A 2004 has an onboard computer so maybe you can take it to a place like autozone to read trouble codes first, they do it as a free service . Sorry really just a guess but hope it helps
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Old 02-02-2012, 08:54 PM
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have a trans shop check ur line pressure when its cold. could be a bad valve in the pump. sounds like a pressure related problem. get it checked out sooner than later, those trannys have been burning up 3-4 clutch packs since they were 700r4's!
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Old 02-02-2012, 08:56 PM
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Overhead.. Welcome to Hotrodders.com

I edited the thread title to provide the membership information on your problem. This also helps the ''search feature'' on the board
Dont worry how old you are... it is the mileage on your body that adds up.
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