Spec Colorado 2008 4x4 diesel gcm? - Colorado Chevrolet Cars & Trucks

Google Cloud Messaging (commonly referred to as GCM) is a mobile notification service developed by Google that enables third-party application developers to send notification data or information from developer-run servers

This website does not do well on abbreviations, - 'gcm - GCM'?

https://www.google.com/search?q=Turbo+diesel+5.9.+What+is+the+gcm

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Found several references:
2004 Colorado:
Engine: 3.5L
Transmission: Auto/4L60-E
Sixteen 13MM bolts need 7-10 ft lb. No reference to any required ordering but CW indicates to go slow in alternating/opposing areas.
Another reference for a 2004 Canyon 3.5L was 84-122 in lb which translates to 7-10.2 ft lb
And this GM reference says 9 ft lbs for the pan bolts
https://www.gmtransmissionparts.com/4l60e-torque-specs
Helpful?
Good luck on your repairs!

If no one on fixya gives you these specs, try a local library or any car parts store in their book reference section.
God bless your efforts.

6.2L diesels ... 84-86 time period (mostly 1984) & were powered by 6.2L Detroit Diesel V8 engine. ... Many M1028s were upgraded at the company level to M1028A2 and A3 specs. ... rated at 155 hp (116 kW) and 240 lb·ft (325 N·m), which was 5 hp (3.7 kW) .

Wheel Nut Torque..........103 ft. lb. (140 Nm)

Torque specs are not important in this application, apply some thread locking compound and tighten the bolts.

45-60 ft lbs is about right for the size bolts that are used on that box.

Axle Preload and Backlash Specifications 8.0 Axle Preload and Backlash Specifications Application
Specification
Metric
English
Backlash
0.08-0.25 mm
0.003-0.010 in
Backlash (Preferred)
0.13-0.18 mm
0.005-0.007 in
Pinion Bearing Preload, New Bearings
1.7-3.4 N·m
15-30 lb in
Pinion Bearing Preload, Used Bearings
1.1-2.3 N·m
10-20 lb in
Pinion and Differential Case Bearing Preload, New Bearings
3.4-6.2 N·m
30-55 lb in
Pinion and Differential Case Bearing Preload, Used Bearings
2.8-5.1 N·m
25-45 lb in

you can usually find those specs at a local repair shop,or your local Chevy dealer.also some auto parts stores