Transmission Fluid Change/Flush - Chevy Colorado & GMC Canyon
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post #1 of 16 (permalink) Old 02-01-2008, 08:37 AM Thread Starter
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Transmission Fluid Change/Flush

How difficult is it to flush my transmission on an 04 Colorado? Is it essential that I drop the pan, or can I just drain and replace? Other than the obvious (drain and replace fluid) what else is involved?

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post #2 of 16 (permalink) Old 02-01-2008, 03:14 PM
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usually a flush is not really needed unless your having some problems. You can just drain and replace the filter and refill and that is a good idea.

Not sure if these trucks have drain plugs in the transmission pans (mine is a 5 speed) the older trucks didn't have drain plugs and it could get very messy changing fluid.

But make sure you get a new filter and gasket kit.

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post #3 of 16 (permalink) Old 03-10-2008, 03:26 AM
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Can anyone tell me how many quarts of tranny fluid a 2005 Z71 LS w/3.5L takes?

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post #4 of 16 (permalink) Old 03-10-2008, 05:50 AM
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No drain plug on the auto tranny. Dropping the pan is the only way unless you suck it out the dipstick tube. Or improvise and use the supply and return lines to the cooler.

Usually with a pan drop you can expect to get about 4-7 quarts of fluid out. I think it holds 11-12 total.

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post #5 of 16 (permalink) Old 03-10-2008, 07:45 AM
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Thank you, KC. I appreciate the info. :)

2005 Z71 LS Colorado Crew Cab
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iRotors XDS Series Brake Discs
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post #6 of 16 (permalink) Old 03-10-2008, 07:51 AM
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Here is a how-to from Amsoil:

http://www.amsoil.com/faqs/ATF_and_Filt ... edures.pdf

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post #7 of 16 (permalink) Old 06-03-2008, 05:14 PM
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Re: Transmission Fluid Change/Flush

I have been having tranny problems with my colorado, and when it broke down, i took it to the dealer. They said they require a certian type of fluid, and I have been waiting for a week now on it. Don't change the fluid with consulting a GM mechanic first. My tranny repairs from possible wrong fluid will be between 2100-2300 plus tax!!!

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post #8 of 16 (permalink) Old 06-03-2008, 09:11 PM
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Re: Transmission Fluid Change/Flush

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Originally Posted by Jamez1999
I have been having tranny problems with my colorado, and when it broke down, i took it to the dealer. They said they require a certian type of fluid, and I have been waiting for a week now on it. Don't change the fluid with consulting a GM mechanic first. My tranny repairs from possible wrong fluid will be between 2100-2300 plus tax!!!
Thats BS.

If GM requires a proprietary fluid that can not be obtained from an auto parts store or any place other than through GM or a Dealer, they must offer it at no charge to thier customers.

Yes the tranny requires a particular type of fluid...but you dont HAVE to get it through the dealer. It should state in the owners manual, and probably on the stick, what type of fluid to use.

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post #9 of 16 (permalink) Old 06-03-2008, 09:15 PM
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Re: Transmission Fluid Change/Flush

I serviced mine a few month's ago, I originally got the filter kit from NAPA and after dropping the pan found out that the one they sold me does not fit ! After they confirmed they gave me the correct part number, I ended up getting my filter kit from the local Chevy dealer for around $35.00, it fit perfectly ! It will take 10 pints "5 quarts" of Dexron 3, I also installed a drain plug in the pan to make it easier next time.

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post #10 of 16 (permalink) Old 06-04-2008, 12:37 PM
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Re: Transmission Fluid Change/Flush

I'm just telling what happened in my case. I had to replace the 3rd-4th gear syncronizers and slides at 53K, now they have went out again at 69,500 miles. The tranny tech told me that it also ate up a bunch of other parts. He guessed that the other mechanic who fixed it the first time might have put standard fluid in it. They said this type is only used in the caynon/colorado, and the pontiac g5. I'm not sure if you could find it at a auto parts store or not, mine is at the dealers cuz i tried to get chevy to fix it. thats when i found out about the fluid.

I have a 5-speed manual, so an automatic may be different. I'm just wanting to warn ppl if this is the case. In less than a year my tranny has cost me over $3000. I don't race it or tow much, just a jet ski, and a 14' boat.

You are probably right, but like i just stated, just check on the specs first. Its better to call and ask then to have it eat the tranny cuz it wasn't the proper type.

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