How many miles before I need to replace the auto trans filter and oil? I drive a 2005 Chevy Colorado inline 5. I have 70K now!

get a pro full flush or only 1/3 the ATF will be changed.

drop pan, (huge flood if no drain plug)
replace filter.
put back new gasket with pan. (add drain plug now if missing)
connect full flush system to lines on trans.
turn on flush sys.
then follow instructions on said system.

the DIY way (done many a time.
is same but add in back the same exact oil drained
then drive 10 miles.
drain/fill again,(plug pull) if not pink
repeat until ATF looks pink/red, or till tummy feels happy.

Depending on the air temp, yes middle of the gauge could be normal.

make sure your fluid level is good1st kinda sounds like your trans. is in need of a rebuild

Hello! Which engine is installed in the vehicle; 5.0, 5.7, 6.5 (Diesel) or 7.4?Guru...Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

It's listed in your owner's manual. Schedule A is normal driving conditions.
SCHEDULE "A"
7,500 miles (12 000km) or at 6 months
- Change engine oil.
- Replace engine oil filter.

15,000 miles (24 000km) or at 12 months
- Change engine oil.
- Replace engine oil filter.

22,500 miles (36 000km) or at 18 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.

30,000 miles (48 000km) or at 24 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace spark plugs.
- Drain and refill automatic transmission fluid and filter (4.7L).

37,500 miles (60 000km) or at 30 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Drain and refill transfer case fluid.

45,000 miles (72 000km) or at 36 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.
- Flush and replace engine coolant at 36 months, regardless of mileage.

52,500 miles (84 000km) or at 42 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if not done at 46 months.

60,000 miles (96 000km) or at 48 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace ignition cables (5.2L/5.9L).
- Inspect PCV valve, replace as necessary.
- Replace spark plugs.
- Inspect auto tension drive belt and replace as necessary (5.2L/5.9L).
- Drain and refill automatic transmission fluid (4.7L).

67,500 miles (108 000km) or at 54 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.

75,000 miles (120 000km) or at 60 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Drain and refill transfer case.
- Flush and replace engine coolant if it has been 30,000miles (48 000km) or 24 months since last change.
- Inspect auto tension drive belt and replace if required.

82,500 miles (132 000km) or at 66 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if it has been 30,000miles (48 000km) or 24 months since last change.

90,000 miles (144 000km) or at 72 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace spark plugs.
- Inspect front wheel bearings.
- Inspect brake linings.
- Inspect auto tension drive belt and replace as necessary.
- Drain and refill automatic transmission fluid (4.7L).

97,500 miles (156 000km) or at 78 months
- Change engine oil.
- Replace engine oil filter.

105,000 miles (168 000km) or at 84 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if it has been 30,000 miles (48 000km) or 24 months since last change.
- Inspect auto tension drive belt and replace if required.

112,500 miles (181 000km) or at 90 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Inspect front wheel bearings.
- Inspect brake linings.
- Flush and replace engine coolant if it has been 30,000 miles (48 000km) or 24 months since last change.

120,000 miles (192 000km) or at 96 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace ignition cables (5.2L/5.9L).
- Inspect PCV valve, replace as necessary.
- Replace spark plugs.
- Inspect auto tension drive belt and replace as necessary.
- Drain and refill automatic transmission fluid (4.7L).

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6 qts. including filter.

start by adding four quarts, then start engine and put thru gears and then back to park and recheck and add as needed,just keep repeating process untill full,make sure you look on dip stick ,it will tell you what kind of transmission fluid to use.

spark plug replacement, air filter, clean throttle body, oil filter change, rotate tires

Spark plugs at 100,000 (use AC Delco plugs, they work best), check air filter at 15,000 replace at 30,000, replace fuel filter at 30,000, service (fluid and new filter) automatic trans at 60,000, replace hoses and flush cooling system at 100,000 miles, (use long life coolant), check belt at 30,000, replace if any rubber in ribs is missing, cracks are ok per factory bulletin's. oil and filter at least every 5,000 miles, lube chassis every other oil change, more often if u drive short trips, lube the door hinges and hood hinges and all latches every 30,000 miles. If I missed anything you want to know let me know. one last note manual trans and differential change lube only if torn down for repair, otherwise it is lifetime.