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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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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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Can anyone tell me how many quarts of tranny fluid a 2005 Z71 LS w/3.5L takes?
 

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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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Thank you, KC. I appreciate the info. :)
 

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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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Jamez1999 said:
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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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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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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To be sure, you should consult your owners manual or a Haynes manual for the correct ATF type.

My 06 uses Dexron 6 and you can purchase it at Autozone.

My next ATF change will also include me installing a drain plug kit for easier, err, cleaner future changes.
 

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Oh, of course. I got my Colo back friday. The gear oil for my manual is 75w-10 (?) GL-3. I could have got it at the local farm store in town. My first mechanic who fixed it last June put reg ATF in it, and this mechanic said my tranny had more wear then any transmission he'd seen. It only had 69, 500 miles, with 16,000 on the new parts. Me and a friend our buying haynes books this week.
 

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Jamez1999 said:
Oh, of course. I got my Colo back friday. The gear oil for my manual is 75w-10 (?) GL-3. I could have got it at the local farm store in town. My first mechanic who fixed it last June put reg ATF in it, and this mechanic said my tranny had more wear then any transmission he'd seen. It only had 69, 500 miles, with 16,000 on the new parts. Me and a friend our buying haynes books this week.
well I dont know what GL-3 is but I had my manual trans and rear end fluid changed at 65K. They put Synthetic fluid in both.

The tech told me it only needs done every 100K (I dont know about autos).

This was a local goodyear service center, not the stealership.
 

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I don't know if the Twins' manual trannies are the same as what the old S-10 came with, but I had to buy GM brand
Synchromesh Fluid which in 1998 cost 6.99 per Qt. to replace what I changed out after a clutch change and syncho
rebuild. It is a 75 wt. oil with additives that smelled very similar to Posi additive.
 

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transmission problem on a 06 colorado xtreme, manual transmission

My transmission rattles when my clutch is disengage after it warms up. Does anyone know what the problem can be?
 

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I just changed mine last weekend, at around 87K miles. I found some good tips on this site and the 355nation one, but to try to sum up what I did:

- Bought 6 quarts Dexron VI at Walmart (they only had 6 in stock, and the auto parts stores near me didn't have any!)
- Bought replacement filter & gasket at Autozone, $16.99
- Drive truck up onto ramps ($43.99 at Walmart, so worth it!)
- Hold replacement gasket up to pan to ensure correct size/shape prior to unbolting pan
- Remove all bolts (think they were 13mm), had to remove a heat sheld (2 bolts, also 13mm) on passenger side of transmission for better clearance
- Have an assistant hold pan up while I bent the #@$% shift linkage a half inch or so out of the way, towards the driver's side
- Lower pan into whatever sort of tray you're using to catch the fluid that by now has probably thoroughly soaked into your arms, hair, and the ground all around you, and dump it into your drain/catch pan
- On mine the old gasket peeled right off
- Pull down on filter (stuck in bottom of transmission), watch out for more transmission fluid splashing out of it
- There's a metal and rubber O-ring that seals the filter in-place, the replacement kit comes with one, but da#$ed if I could remove the old one, even with all manner of pulling tools. I searched the forums and it sounded like most people just left the old one in there. I saw a post from one guy who said he was able to remove his with a slide-hammer (!!!), and a few others who mentioned that they hammered a screwdriver up into the side of it, bent it inwards on itself, then were able to grab it with pliers. I left mine in. :p
- After cleaning the pan of all debris line the new gasket up onto it, and hold it in-place by pushing all the bolts through (holes in gasket will hold tight onto the bolts)
- Bolt pan back into place, reattach heat shield, and bend shift linkage back into place
- Add 5 quarts Dexron VI, test drive, and check fluid level. Mine was perfect with just approximately 5 quarts

I've heard some people say you should do this every 30,000 miles, other people say 60k or even 100k (I think the manual says 100k), I did mine at 87K-ish and the fluid still looked good, but wanted to get it done before the winter months hit us.

Good luck with yours!! :)
 
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