5.9 Limited 100k Maintenance Suggestions? - JeepForum.com
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post #1 of 7 Old 10-13-2021, 01:22 PM Thread Starter
mkm5
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5.9 Limited 100k Maintenance Suggestions?

So, the Jeep is just about to hit 100k miles. I've been thinking about whether I need to start further preventative maintenance than just the recommended, due to being 24 years old.

Or should I just stick with the "if it ain't broke" philosophy?

What do you guys think?

I've been trying to stock up on parts that might become hard to get too.

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post #2 of 7 Old 10-13-2021, 04:56 PM
PolkaPower
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Quote:
Originally Posted by mkm5 View Post
So, the Jeep is just about to hit 100k miles. I've been thinking about whether I need to start further preventative maintenance than just the recommended, due to being 24 years old.

Or should I just stick with the "if it ain't broke" philosophy?

What do you guys think?

I've been trying to stock up on parts that might become hard to get too.

What have you already done?


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post #3 of 7 Old 10-13-2021, 05:07 PM Thread Starter
mkm5
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Well, it's had new spark plugs and cap and rotor, Pcv valves, air filter, water pump and thermostat in the past 35,000 miles.

I got a bit of death wobble last spring and decided to replace all the tires, shocks, control arms, sway bar bushings, and steering stabilizer. I think it was the tires that caused the DW.

I drained and refilled the axles and transfer case and tightened up all the oil pan and transmission bolts.

New serpentine belt.

Not much else that I can think of.

Brake pedal is really firm on stops, I feel like a bleed with fresh fluid would help.

Parking brake is inop.
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post #4 of 7 Old 10-13-2021, 05:20 PM Thread Starter
mkm5
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It's also got that low speed growling rumbling sound coming from the rear axle or bearings. Hasn't changed in 5 years.
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post #5 of 7 Old 10-13-2021, 07:27 PM
PolkaPower
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5.9 Limited 100k Maintenance Suggestions?

Quote:
Originally Posted by mkm5 View Post
It's also got that low speed growling rumbling sound coming from the rear axle or bearings. Hasn't changed in 5 years.

The rear grumbling are the carrier bearings. It happens frequently to the 44a.
The factory Trac look is probably getting close to needing a rebuild if not already. Plus you've got all that metal from the carrier bearings shaving off in there.
I'd do the plenum gasket repair from Hughes engines to stop any oil leaking into the intake.
The viscous coupler in the 249 case will probably start to go. Mine was pretty fried by 127k. You want to get ahead of that because it will cause other parts to break and wear your front tires out.
Engine and transmission mounts.
The 46re typically has the reverse/overdrive snap ring fail sooner or later.
I'd out a auxiliary transmission cooler on if you want your transmission to last as long as possible. As big as you can fit. Chrysler did put them on 98s.
Alternator might start to fail soon. You'll notice it when the efan kicks on. A good generator shop can rebuild it.
When the efan temp switches fail you'll have to source replacements. Originals are out of production.
Or you can bypass the factory set up and run a fan controller.
100% add an oil catch can on the pvc return line going back to the intake. Blowby gets worse with age.
The digital climate controls sometimes go out because of poor soldering.
I'd probably but some ac actuators since those go bad with age.


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post #6 of 7 Old 10-14-2021, 08:03 AM
Timo_90xj
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Quote:
Originally Posted by mkm5 View Post
Brake pedal is really firm on stops, I feel like a bleed with fresh fluid would help.
Firm pedal means there is zero air in the system, which is a good thing. If it is too firm, you have a brake booster problem.

If you don't now when the brake fluid was replaced, suck out most of the old dirty fluid from the reservoir, then refill with fresh fluid, do a brake bleed one caliper at a time (rear right, rear left, front right, front left) until fresh fluid comes out.

Quote:
Parking brake is inop.
It is fairly common, most likely bad brake shoes and/ or adjusters and other small parts. It is also fairly common for the cam/ lever setup to seize, wire wheeling the rust off + thorough lubrication is the cure.


Other than that, PolkaPower covered the usual stuff.

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post #7 of 7 Old 10-14-2021, 08:08 AM Thread Starter
mkm5
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Great information, thanks guys!

I'll start sourcing the parts mentioned and get a plan going.
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