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In my opinion, the Isuzu Ascender (at least the 2004 version), looks really, really similar to the 2004 TrailBlazer. Biggest difference was the headlight assemblies. I used to work with a guy that purchased a 2004 Ascender and if it had been the same color as my TrailBlazer, it would have been extremely difficult to tell them apart.
 

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Ravalli - I would love to have the HD electrical system in your '05 for my radio gear!
 
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I drove a 2019 Equinox when I had to leave my TrailBlazer in the shop for a day. I did my best to adjust the seat and mirrors, but I hated driving it. I just could not get comfortable in the seat.
 

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As long as you keep up on the maintenance, you should remain happy.

A couple of things to keep an eye on. First the power steering lines. They have a tendency to rust out for a couple of reasons. One, by the collection of dirt, grime, oil vapors, and two by electrolytic corrosion. Replacing them is quite a job - but do able for one with a fair amount of experience, and a lot of patience. I believe the book labor on replacing the parts is in the neighborhood of 5 - 8 hours.

Two, keep up with the oil changes because the engine uses a variable valve timing solenoid that is driven by oil pressure. Dirty, forgotten oil tends to gunk up the stainless steel screens in them causing problems.

Three, if you need to do work on something that requires you to disconnect the battery, DO NOT disconnect the battery!!!!!!!! Remove the fuses for the appropriate fuses instead. Why? Because every time you disconnect and then reconnect the battery, the HVAC actuators go through a recalibration procedure and because of their age, the nylon gears in them have become quite brittle and are likely to break which means replacement, and some of the HVAC actuators are a royal pain in the @$$ to replace - pain as in having to remove the dash!!!

If you ever do have to replace the battery, be sure and use one of those Keep Alive Memory (KAM) devices or a battery powered jump pack to keep the PCM and BCM powered and "alive".

If/when you need to replace the spark plugs, these engines are very, very picky as to what spark plugs go into them. They prefer the ACDelco 41-103 plugs for the 4.2L engine, and the ACDelco 41-192 plugs for the 5.3 L engine.

Keep a new igniton-starter switch on hand because they are a known weak spot. Get a good one such as one from ACDelco, Delphi, NAPA Echlin, Standard Motor Products (non T series) or BWD (non P series). Stay away from the $9.99 internet white box specials.

Good Luck!
 
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