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Transmission Flush


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#1 trx680

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Posted 24 September 2009 - 08:00 AM

I just bought a 2001 2500HD, 6.0, 160,000 miles with ....I'm not even sure what tranny it is. The people I bought it from are the 2nd owners and didnt have it long. They dont know the history of the trucks maintenance.

I want to do a tune-up and other preventative maintenance, including the transmission.

I've heard bad stories about having tranny flushes and breaking lose debis that clogs up the tranny ports and destroys the tranny....

Anyone here had a tranny flush? Had any problems? I would take it to the GM dealer to have it done, not jiffy lube or some place like that.

I dont know it its ever been flushed or serviced before, and it has 160,000 miles and runs/shifts great.

-----------any suggestions?

#2 bossier62guy

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Posted 24 September 2009 - 08:17 AM

I just bought a 2001 2500HD, 6.0, 160,000 miles with ....I'm not even sure what tranny it is. The people I bought it from are the 2nd owners and didnt have it long. They dont know the history of the trucks maintenance.

I want to do a tune-up and other preventative maintenance, including the transmission.

I've heard bad stories about having tranny flushes and breaking lose debis that clogs up the tranny ports and destroys the tranny....

Anyone here had a tranny flush? Had any problems? I would take it to the GM dealer to have it done, not jiffy lube or some place like that.

I dont know it its ever been flushed or serviced before, and it has 160,000 miles and runs/shifts great.

-----------any suggestions?


Had mine done about 30K miles ago at the GM dealer and will have it done again soon in the near future....no problems at all.

#3 Stevens11

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Posted 24 September 2009 - 08:19 AM

Flush no, evac, yes.

GM did mine with the assist of a machine that uses the transmissions own pump to evacuate the old fluid and pump in the new. Worked great in my book. :lol:

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#4 See Ya

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Posted 24 September 2009 - 08:46 AM

Had mine flushed by some sort of machine that stood veriticle on rolling wheels. Had no problems to speak of because of it. Would get it done again in the future as well. Personally if I were you, 160,000 miles, I would get everything done on that truck. Plugs, all fluids! If there is no record and you have no warranty, it is wise to have that truck maintained. 160,000 is nearing the Golden years, a dealer once told me those 6.0's are good for 200,000 plus.
Moved on.

#5 kdog55

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Posted 24 September 2009 - 07:25 PM

I'm only at 50.000 and i am considering it myself. I have heard that there is a very noticeable difference in the shifts (in a good way). Have you noticed this also or is it just a maintenance thing?
FWIW, a fuel system service was well worth it for a noticeable difference!
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#6 See Ya

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Posted 24 September 2009 - 09:39 PM

Only thing I noticed after flush was no burnt fluid smell coming from trans when I went out plowing. My trans shifts real nice, never had any complaints about it. When it comes to maintenace on my vehicles, I am very meticulous, more so with my truck...
Moved on.

#7 imollison

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Posted 16 October 2009 - 12:55 PM

I just bought a 2001 2500HD, 6.0, 160,000 miles with ....I'm not even sure what tranny it is. The people I bought it from are the 2nd owners and didnt have it long. They dont know the history of the trucks maintenance.

I want to do a tune-up and other preventative maintenance, including the transmission.

I've heard bad stories about having tranny flushes and breaking lose debis that clogs up the tranny ports and destroys the tranny....

Anyone here had a tranny flush? Had any problems? I would take it to the GM dealer to have it done, not jiffy lube or some place like that.

I dont know it its ever been flushed or serviced before, and it has 160,000 miles and runs/shifts great.

-----------any suggestions?

Having worked in a GMC dealership and having worked on a lot of trucks that saw hard duty running the oil fields of Alberta all I can say is 'flush the trans now......, change the front and rear diff, have your injectors checked, and have a good tech look at all the 'joints' in the drive line. Especially if you and the previous owner do not know the history of the vehicle and how it was used.
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#8 GMCSIERRA4ME

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Posted 17 October 2009 - 06:13 PM

I had a change done twice, and the last time a flush was done. That was because the fluid was turning colour.
Never had any problems, and the guy at the tranny shop said it only needs to be flushed if something looks wrong with the fluid.

I have 275,000 Km on my truck

Edited by GMCSIERRA4ME, 17 October 2009 - 06:14 PM.

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#9 Black02Silverado

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Posted 17 October 2009 - 07:25 PM

If the transmission has never been touched and the fluid is still nice and pink then a fluid change out would be a good thing to have done. You can either do it your self or have the dealer do it. Click here and follow these procedures to a complete change out of the transmission fluid.

Now if the fluid is pretty dark and has a burnt smell then a complete change out might not be the way to go. I would then just drop the pan and change out the filter and put back in fresh fluid. Then at your next oil change just change out the transmission fluid again and do that two more times at each engine oil change. By that time it will have completely changed out the fluid and it will not "shock" the transmission with a complete change out. Not to mention it will not cost as much as it would for a complete change out.

I personally like to change the fluid in an automatic transmission every 30k miles, unless you are running synthetic then you can take it to 50k miles. It is well worth it considering the cost of having to repair/replace one. :jester:
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#10 KMGZ400

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Posted 17 October 2009 - 09:03 PM

i had the tranny fluid changed in my suburban at about 110,000 and my tranny went at 120,000. i dont know if the change had anything to do with it but i probably wont have it done again without some sort of warranty or something.

also, i had the fluid changed by a chevy dealership

thats just my expirence

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#11 BigBlueSilvy

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Posted 18 October 2009 - 04:33 PM

the manual for my truck says nothing about flushing, only to change the fluid at 100k miles (or earlier under heavy driving conditions) therefore i stayed away from it, i just had the fluid and filter changed.
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