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Discussion Starter · #1 ·
Hi, i just bought my first truck 14 days ago. It's a 04 1/2 Gmc 2500 HD Duramax with automatic transmission (allison).

When i'm on tow haul (with trailer or no trailer), after shifting in 2 nd gear, there is a funny noise that last for 1 or 2 seconds. It only does that on tow haul ???

The sounds is like BOOUVVVVVVVVVVVVVVVV.

Can any body help me ?

Is it a major transmission problem ?

The truck as about 40 000 miles.

Phil
 

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Discussion Starter · #3 ·
I dont kwow when the last time the transmission was serviced, a got the truck like 14 days ago from a dealer .
Do you think that a transmission oil and filter change could solve the problem.

The owner before me tow a fifth wheel for is vacation.
 

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Discussion Starter · #4 ·
Ive notice too that the sounds get louder as the transmission gets hotter , and or when the wheater is really hot !


Phil
 

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Discussion Starter · #6 ·
i didnt check that yet, what is the tranny oil suppose to smell and look like ?
Other wise, it shifts really smooth.
Do you think that a oil and filter change could solve the 2 seconds noise in 2nd gear on tow haul ?
 

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Discussion Starter · #9 ·
Today, iv'e changed the oil and the filter of the transmission, and for now, no more noise.
The oil was dark red and smelled burn, and there was a lot of "/$%?&* on the magnet over the filter.
7 liters of new oil and a filter seems to have solve the problem, for now ...

Thanks a lot !

Phil

2004 2500 HD Duramax LLY.
 
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