Transmission fluid change - Chevy and GMC Duramax Diesel Forum
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Old 10-02-2012, 08:41 AM   eBay Motors  #1 (permalink)
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Transmission fluid change

I'm gonna change my transmission fluid on my 2003 2500HD this weekend (right after I get done changing out the injectors) and was wondering what the fluid capacity it. It has the stock pan and I will be replacing both filters. On another note I also plan on looking into a belt squeak that I have, the belt was replaced about 10k ago, is there any of the pulleys or is the tensioner prone to going bad on these trucks?
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Old 10-02-2012, 10:39 AM   eBay Motors  #2 (permalink)
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As a general rule they don't recommend changing the internal filter unless you are rebuilding the transmission. If it has never been changed before and you are going to use transynd then you need to do a double change. Drain, change the spin on filter, fill,(about 2.5gal) run it about a week, then drain and refill again.
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Old 10-02-2012, 11:23 AM   eBay Motors  #3 (permalink)
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Wierd i am changing trans fluid this weekend and also have a belt squeal! Haha i bought 5 gallons of amsoil $$$ to cover my trans and tc. Both filters will be swapped on mine. I read you need 12 qts for a full flush though and about 7 if your not dropping the pan.
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Old 10-02-2012, 11:53 AM   eBay Motors  #4 (permalink)
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Before you guys jump without looking read this thread. It's long but full of really good info.
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Old 10-03-2012, 11:52 AM   eBay Motors  #5 (permalink)
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Originally Posted by georam1 View Post
Before you guys jump without looking read this thread. It's long but full of really good info.
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Thanks ill check it out.
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Old 10-03-2012, 01:54 PM   eBay Motors  #6 (permalink)
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Depending on the mileage you can swap out the tensioner and both idler pulleys. Plus, get a gatorback serp belt and no problems for 100K. Good luck.
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Old 10-03-2012, 04:25 PM   eBay Motors  #7 (permalink)
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x2 on Gatorback belt. I replaced tensioner and idler pulleys and it still squeeked. Got the Gatorback and not a single word has come from it for 12k miles.

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Old 10-03-2012, 04:43 PM   eBay Motors  #8 (permalink)
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Quote:
Originally Posted by Earnhardtfan View Post
Depending on the mileage you can swap out the tensioner and both idler pulleys. Plus, get a gatorback serp belt and no problems for 100K. Good luck.
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x2 on Gatorback belt. I replaced tensioner and idler pulleys and it still squeeked. Got the Gatorback and not a single word has come from it for 12k miles.

Sent from my PC36100 using AutoGuide.Com Free App
They are good belts no doubt, thanks guys.
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Old 10-04-2012, 11:11 PM   eBay Motors  #9 (permalink)
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Thanks for all the replies, both concerning the belt issue and the transmission, one more question though. This may seem kinda dumb but this is my first time with not only a diesel truck but also working with a transmission that uses 2 filters. Ive decided to just change the spin on filter, what is the proper procedure. Just simply spin off and spin on a new one or do I drain the fluid in the pan along with the filter change.
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