Have a 2012 Suburban 1500 Z71 with approximately 140k miles.

Have been diligent with fluids maintenance — engine oil, tranny, and coolant.

We’re at a point of either putting some money into vehicle or look to hand off to someone else to enjoy what has been a wonderful vehicle. To this day, the vehicle continues to run great. Would prefer to keep this for at least another 25k miles (or about two years). Dream scenario would be 200k miles.

At a minimum, I know the vehicle needs new shocks and new brake rotors/pads. Will likely go with either a decent Bilstein or Fox setup on the shocks. On the brakes, I go back and forth between AC Delco Gold (told the OEM is not available anymore) or a nice PowerStop Z36 setup.

I’m trying to make a list of all the other things we should be doing if we want to reduce the probability of any major mechanical failures that would leave us stranded out in the middle of the mountains/Forrest road.

What is on my radar is:

1) change spark plugs and wires (did already around 90k miles)
2) change timing belt (think it has a belt and not a chain)
3) change out all hoses and other belts
4) change break calipers?
5) change suspension bushings?

Most of the miles are highway miles, but we do drive in the mountains so assuming those are harder highway miles than say driving through corn fields in Nebraska. ;-) And, we do some forrest road driving which I figure the washboard has beaten up the shocks and likely worn some other suspension components.

Look forward to hearing your expertise!

 

My '11 Tahoe is at 148k miles. There is no timing belt, it's a chain, no maintenance. If you put the same original plugs in when you changed them at 90k your good to 190k miles.
Shocks, yes, they are worn out. I've only changed the rears in mine as I have the auto leveling air shocks and the air bags on them were leaking. I have the electronic suspension, so the front struts are staying in until the start leaking as they are expensive.
Only hoses I have done were the heater hoses as they were leaking at the T for the rear heater lines.
I only change calipers if they leak or freeze up as I'm in a salt zone. I use coated rotors and have been using Wagner OEX pads for the last 2 brake jobs. My truck see's towing duty.

 

Spark plugs are due about 100K intervals. Servicing the trans and differentials about 50K intervals. Plug wires generally as needed and replaced as a set(unless under warranty). Coolant exchanges are due about 100K. I recommend oil changes about 4K. Some may disagree with this, but this is my opinion. In the owners manual there is recommended maintenance schedules. Belts and hoses as required and should be inspected at oil changes. The other items on your list are as required. hope this is helpful.

 

I agree with the above responses. And make sure that the flexible brake hoses aren't cracked.

On my own vehicles (listed below), I replace the brake pads or brake shoes only, unless the rotors/drums are so worn that they need machining or replacement. I also use Wagner OEX.

I've got factory rotors and drums still on most of my vehicles.
'98 2WD Frontier, 4-cylinder, 5-speed, white regular cab, purchased in 2004 with 100K on it for the kids to drive, now it's back with us, 267K. 2004 King Cab Frontier 2WD, 4-cylinder, 5-speed, electric blue purchased in Dec. 2011 at 89K. 2014 Yukon XL Denali since Nov. 2022, bought with 76K miles. Also 1988 Mazda B2200 Cab Plus truck (since 1994, 230K), 2WD, 4-cylinder, 5-speed, great truck. And 1971 VW Convertible (mine since 1976) and 1970 Volkswagen (260+K. mine since 1972).

 

Cut the transmission change in half if your tranny has no filter or pan.and is stuffed into the trans. where you cant change it.
In other words 25-30K.