The 8L45 fluid change is pretty straight forward. You will replace approximately 6 quarts of fluid that is in the pan. Make sure you are on a level surface when doing this procedure. This procedure will be the same for 2017+ Chevy Colorado's and GMC Canyons that are equipped with the 3.6L V6 motor and the 8 Speed Transmission. It's important to note, that it's OK to add slightly more fluid than necessary when you refill the transmission. When you do the fluid level check procedure and remove the standpipe plug at operating temp, the pan will drain down to the correct level. Then you can reinstall the plug and be good to go.

READ THIS DOCUMENT FIRST BEFORE ATTEMPTING THIS PROCEDURE.
Link to printable procedure document: https://tinyurl.com/8L45transmissionf...

Note: While this procedure was performed on an 8 Speed 8L45 transmission, however the 6 speed 6L50 transmission will have a very similar fluid change process. However, it will use a different fluid and filter.

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PART NUMBERS:
Filter Part #: TF922
Mobil1 Fluid Part #: 124715 (BLUE LABEL)
Pan Gasket Part #: 24260071
Transmission Pan Part #: 24274616
Transmission Pan Bolts Part #: 11589299
Cat Flange Gasket Part #: 22971963
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Pan Bolts - 10mm - 89 in/lbs
Standpipe Bolt - 10mm - 80 in/lbs
Cat Flange nuts - 15mm - 37 ft/lbs
Exhaust Hanger Bracket - 15mm - 43 ft/lbs
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Timestamps
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00:00 - Intro - Parts & Tools
03:23 - Examining Transmission Under-body
05:15 - Loosening Exhaust
06:33 - Removing Fluid from Trans Pan
08:23 - Removing Bolts from Trans Pan
09:50 - Examining Trans Pan on Work Bench
11:09 - Examining Trans Pan Gasket
12:18 - Replacing Transmission Filter
13:04 - Reinstalling Trans Pan
15:05 - Refilling Transmission Fluid
16:11 - Reinstalling Exhaust
16:46 - Start up & Fluid Level Check
18:43 - Checking Standpipe Plug
19:38 - Outro
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