2004-'06 Pontiac GTO | Buyer's Guide

Robert
By Robert Bowen
Sep 12, 2022 | Pontiac, holden, GTO, GRM+, Monaro | Posted in Buyer's Guides | From the Feb. 2013 issue | Never miss an article

Photograph Courtesy GM

The recipe for the traditional muscle car was simple. Take a plain-Jane, midsized offering and re-engineer it for performance: big engine, big tires and, in many cases, big graphics. That plan of attack gave us a laundry list of tire shredders, most sporting now-iconic badges on their flanks: Oldsmobile 442, Chevelle SS, Plymouth Road Runner and more. Pontiac’s entry into this field was the one that many consider to be the originator of the species: the GTO

The early ’70s fuel crisis removed most muscle cars from the showroom, but the smaller pony cars continued. After 2002, however, both the Pontiac Firebird and Chevy Camaro were dead, and at the time GM didn’t have a replacement on the horizon. 

This meant that GM, for the first time in decades, lacked a midpriced, rear-wheel-drive performance car. Part of the reason was cost—by then the company had exclusively moved to front-wheel-drive platforms for its large and midsize passenger cars, so there was no easy way to share the development costs that could easily produce a rear-wheel-drive performance model. 

The Cadillac CTS chassis was one option, but the large car was designed from the outset as a premium chassis with a premium price tag. Building a less expensive CTS or badge-engineering it into something else would take away some of the prestige that it enjoyed. This left GM without options for a performance car that didn’t steer with its driving wheels. 

Born Great

Luckily, the head at the time was Bob Lutz, an old-time car guy with a soft spot for lost causes. He felt that GM needed something to inject a bit of excitement into at least one of its many brands; he chose Pontiac. At the time, it was the only brand with a lineup that was shockingly truck- and SUV-free—and it had the low sales to prove it. For raw material, he looked to the Holden Monaro coupe being produced in Australia since 2001 for local consumption and a few export markets. 

While Holden was a GM subsidiary, the capable car was not available in the United States in any form. But it had all the right features in place: small-block V8 power, left-hand-drive capability and a decent, if dated, rear-wheel-drive chassis. 

Even in its later dual exhaust form, the rear of the GTO isn’t much to look at. Photograph Courtesy GM

That chassis came to the Monaro by way of the VT Commodore—based on a widened and strengthened Opel Omega platform. The Omega, you may recall, was the same car that gave us the unloved Cadillac Catera. So in an odd twist of fate, the same Euro DNA came to the U.S. as two distinctly different products from different divisions of GM. Ah, the old days of platform sharing.

According to GM media releases, the Holden chassis was adapted for U.S. consumers in only 17 months. Pontiac engineers revised the platform to accommodate American crash and emissions requirements as well as give the car a distinctly Pontiac look. 

One of the biggest changes to the Monaro involved moving the gas tank from below the trunk to behind the rear seat. This was done for crash safety, and later Australian-market cars inherited this change as well. 

The only fitting name for the new coupe came straight from the Pontiac history book: GTO. While the name was retro, the design was anything but. Unlike the most recent Mustangs, Camaros and Challengers, the Monaro-turned-GTO was a modern design with no vintage-inspired frippery. It was modern to the point of boredom, however—a trait that would later hurt the car’s prospects in the U.S.

The Humbler

While the Monaro was available with a 3.8-liter supercharged V6 as well as a V8, Pontiac selected only the V8 version for the GTO. It was the 5.7-liter Gen III small-block used in the LS1-trim Firebird and Camaro, and the standard engine in the C5 Corvette. With 350 horsepower on tap, the 3700-plus-pound coupe could really hustle—at least in a straight line.

This all-new GTO arrived for the 2004 model year, and early magazine and blog reviews were cautiously positive. They were almost unanimous in praising the interior design, materials, and very non-GM level of fit and finish. A distinct lack of rattles and creaks, a low interior noise level and an overall refinement were on par with the best GM cars ever made. Some journalists even went so far as to compare it to cars like the BMW M3.

The exterior styling was prudently praised for being subdued and free of the extraneous scoops, cladding and chrome so favored by Pontiac at the time. 

However, the flip side was that most reviewers felt the big coupe lacked the style and presence expected of a car bearing the name GTO. Other than the large wheels and tiny spoiler, there wasn’t much to hint that this was a V8-packing performance car.

The engine, as anticipated, was a big hit. It made all the right noises, and when drivers prodded the right pedal the car moved out with authority. Straight-line acceleration was everything you’d expect from a car named after a ’60s muscle machine. On the road, reviewers liked the handling and ride balance, although there were some minor complaints about the harsh bumpstops. The big tires and wheels gave it decent grip, and a well-calibrated traction control kept lead-footed drivers out of trouble.

Photography Credit: David S. Wallens

Reviewers were not nearly as kind to the optional T56 six-speed manual transmission and its much-disliked skip-shift feature, which was intended to help fuel economy. It was a tough transmission to shift even at the best of times, and the GTO’s version was not the best of models. A soft clutch, soggy brake pedal and lackluster stopping distance took some of the edge off the GTO’s performance capabilities as well. No dead pedal was another minus.

Speak Softly and Carry a GTO

Unfortunately, buyers did not warm to the new GTO when it finally made it into Pontiac showrooms. Pontiac planned on selling at least 18,000 units per year, but the first cars sat on dealer lots for months. Discounts were needed to move old stock before the 2005 GTOs were slated to arrive. 

The slow sales were all the more disappointing considering how well the car was received by reviewers and how its performance stacked up against competitors. Here was a car with 350 horsepower that could do the quarter-mile in around 13 seconds, pull over 0.88g on the skidpad, and still cost less than $32,000. 

GM rightly guessed that the problem lay with the car’s lack of style and consequently put in some early changes to goose sales. Instead of waiting for the 2005 model year, a new hood sporting twin scoops—a nod to the original 1964 Pontiac GTO—was rushed into production late in the 2004 model year. The freshened hood was supplied to dealers as part of a Sport Appearance Package and also included a different rear spoiler and inset grilles. The improved styling helped move the remaining ’04s off dealer floors—eventually.

The GTO’s interior is a great place to spend hours in the saddle. Clear, readable gauges, comfy seats and upscale materials rival the best German sedans. Photography Credit: David S. Wallens

The biggest change—and only substantial one—to the GTO was the replacement of the Gen III LS1 small block with the Corvette’s Gen IV LS2 engine. The new engine displaced nearly 6 liters and pumped out 400 horsepower and 400 lb.-ft. of torque. Along with the upgraded hood, this new setup seemed to be how the GTO should have been made from the beginning. 

GTO sales stabilized as the production run went on. One more model year, 2006, was the final one for the GTO because the Holden Monaro was at the end of a long production run. And like the GTO, the Pontiac nameplate would be similarly retired soon after. At least we have the memories—as well as a fantastic performer for today’s enthusiast. 

Things to Know

Photography Credit: Courtesy GM

Body and Interior

  • Some owners complained about paint quality and the finish used for interior trim parts. 
  • The fuel tank relocation for the U.S. market made the trunk fairly small for a nearly 2-ton car. 
  • If the motive is to confuse people, import Holden Monaro body parts to build an Aussie clone. 

Suspension

  • Some early cars had trouble with rear subframe bushings. As with the clutch issues, a technical service bulletin was issued. 
  • The chassis is pretty good in stock form, but Australian aftermarket tuners like Whiteline offer a large catalog featuring anti-roll bars, bushings and suspension kits.
  • The GTO is already pretty low from the factory, but more performance is available if buyers are willing to compromise some ride height. The GTO’s commodious fenders can accommodate 17-, 18- and 19-inch tires.
  • The later cars’ larger brakes are nice but can be installed on the ’04s without much trouble.

Engine and Drivetrain

  • As for which GTO to buy, the big thing to consider is whether the buyer wants the LS2’s 400 horsepower or is willing to settle for the 350-horsepower V8 used for the first model year. We'd buy the best manual-transmission car we could find and not worry about the extra power.
  • The first modification to make to any manual-transmission GTO is a skip-shift remover. The skip-shift device forces the driver to shift from second to fifth gear unless the car is being driven hard. Removing this fuel-saving feature is simple: Just install the right resistor in line with the gear position sensor. Many performance parts suppliers sell a simple plug-in resistor to make this job super easy. 
  • As far as reliability, most GTOs have been remarkably trouble-free. The LS1 and LS2 engines are tough and recognized as such, as are the T56 transmission and the rest of the drivetrain. 
  • Some early cars had clutch issues, but a dealer technical service bulletin was issued to take care of these offenses. 
  • There is not a lot of free horsepower hidden in the LS engines, but they are the basis of a thriving aftermarket that will gladly build anything imaginable. From basic bolt-ons to 1000-horsepower turbo monsters, chances are someone has already done it—probably more than once.
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Comments
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06HHR (Forum Supporter)
06HHR (Forum Supporter) Dork
1/7/22 9:17 a.m.

Been watching GTO prices for the last few months now.  Clean 2006 examples were up to 30K back in November, they are starting to come back down to earth, but not quickly.  

Tom_Spangler (Forum Supporter)
Tom_Spangler (Forum Supporter) GRM+ Memberand PowerDork
1/7/22 9:56 a.m.

Another car I should have held on to for a few more years....

06HHR (Forum Supporter)
06HHR (Forum Supporter) Dork
1/7/22 10:04 a.m.

I should have bought one back in 2019-2020, when even 2006 models were sub 15K.  Not anymore, hard to find a 2004 for under 15K now. 

EDIT: Prices are coming down quicker than I thought.  I just got an Autotrader alert with a 2004 for $14,900 and a 2006 for $15,995.  Still more than I would have paid pre-covid, like everything else. 

 

dannyp84
dannyp84 Reader
1/7/22 10:54 a.m.

When I bought my IS300, I was shopping between the Sportcross, E36 M3 in Techno Violet, or a 6 speed GTO. At the time, the GTO was the most expensive of the 3, but after talking to owners, it probably would've been the best of the 3 for long highway runs, the seats were excellent. High-mileage 04s were a fuzz under 10k back then..

BA5
BA5 GRM+ Memberand Reader
1/7/22 2:00 p.m.

I had an '06 a ways back.  Was really a pretty darn good car.  A couple of minor bushing replacements fixed basically everything that was wrong with it.

It was a really fun car, but didn't make for a particularly good track car.  It really consumed some very expensive consumables on track.  

Javelin
Javelin GRM+ Memberand MegaDork
1/7/22 2:51 p.m.

A few more notes on the GTO:

The Red interior was available on Quicksilver, Torrid Red, and Phantom Black all 3 years and was fairly common. The Blue interior was only available on Impulse Blue all three years and is actually quite rare.

All of the colors had color-coordinated gauges and stitching except the very rare Pulse Red 04 which had grey gauges and red GTO embroidery on the seats. Yes, that means a yellow GTO has yellow gauges and stitching, a red one has red, etc.

The 04 only Cosmos Purple only came with matching Cosmos Purple interior, the only color without a Black interior option.

The rarest color/trans combo of all was the 04 Barbados Blue 6-speed with just 271 made.

You could order a flat 04 hood from the factory still in 05 as an option. Just 24 were made!!

The factory tire size of 245 is about the max due to the suspension design, tiny wheelwells, and narrow body. You can get more, but there will be compromises. This is mostly what holds it back from autocross and track work.

The power seat motors are the slowest ones known to mankind, but the interior is easily the best GM had made for decades. When you turn on the car, a little GTO in the gauge cluster does a burnout.

Fun fact, the 04 GTO's engines are weird. They are all LS6 blocks and intake manifolds (yes, same casting numbers as a C5 Z06 and everything) with LS1 heads.

I once held the 7th quickest all-stock GTO pass in the country with a 13.08@106 in 07ish with ThunderCougarFalconGoat's 05 6-speed.

BA5
BA5 GRM+ Memberand Reader
1/8/22 12:25 p.m.
The power seat motors are the slowest ones known to mankind, but the interior is easily the best GM had made for decades.

So very, very slow.

Supposedly they speed them up for the 06 models, but I raced a guy with an 05 and the difference was negligible, if it was anything at all.

A 401 CJ
A 401 CJ SuperDork
1/9/22 10:08 a.m.
BA5 said:
The power seat motors are the slowest ones known to mankind, but the interior is easily the best GM had made for decades.

So very, very slow.

Supposedly they speed them up for the 06 models, but I raced a guy with an 05 and the difference was negligible, if it was anything at all.

A power seat race?  

ZOO (Forum Supporter)
ZOO (Forum Supporter) GRM+ Memberand UltraDork
1/9/22 11:25 a.m.

In reply to A 401 CJ :

If there are two of anything in the GRM community, a race will take place.  If there's only one, someone will break out a stopwatch.  It's the way . . .

93gsxturbo
93gsxturbo UltraDork
1/9/22 12:56 p.m.

I remember when my buddy had an 06 how nice the interior was compared to my 02 Corvette.  Everything just felt and looked nicer.  

Unfortunately lack of big tire and weaker driveline than a comparable Camaro or Corvette has sort of led them to boulevard cruiser status.  

BA5
BA5 GRM+ Memberand Reader
1/9/22 4:14 p.m.
A 401 CJ said:
BA5 said:
The power seat motors are the slowest ones known to mankind, but the interior is easily the best GM had made for decades.

So very, very slow.

Supposedly they speed them up for the 06 models, but I raced a guy with an 05 and the difference was negligible, if it was anything at all.

A power seat race?  

Yes. And looking back through the GTO forum I frequented at the time I don't think I was even the only one to have done that!

Duke
Duke MegaDork
1/9/22 6:24 p.m.

When I bought my E46 in 2006, GTOs were too new to be in my budget, and I needed 4 doors.

I held on to the E46 through the entire time it would have made even slightly reasonable sense to have traded it for a GTO.

Unfortunate timing for me, because I really would have liked to own one.

 

nervousdog
nervousdog HalfDork
6/19/22 8:27 p.m.

I loved my Cosmos purple. Still miss it sometimes.

BA5
BA5 GRM+ Memberand Reader
9/11/22 8:30 p.m.

I could never figure out when they didn't at least make the SAP front end standard. It was a lot less staid than the basic front bumper cover.

BA5
BA5 GRM+ Memberand Reader
9/11/22 8:30 p.m.

I could never figure out when they didn't at least make the SAP front end standard. It was a lot less staid than the basic front bumper cover.

Harvey
Harvey SuperDork
9/12/22 4:43 p.m.

I do regret not buying the 2004 they had on the lot new for $16000. It was a fire sale on these towards the end of the first model year.

Opti
Opti Dork
9/12/22 7:39 p.m.

If people are actually looking for these they need to know the GTo specific stuff is expensive. Random trim pieces and body panels were much higher than the other LS powered cars they will probably be price shopped with.

Answer is by a nice one, a beat one will be expensive to bring up to spec.

The suspension work, but wear out quickly by this point, it will probably need all the bushings.

Ignition housing problems are common and used to be expensive to fix properly, we fixed a reoccurring issue with cleaning up the cast housing with a dremel, I'm not sure if anyone has documented or come up with a solution that isn't replace the housing.

Tint and leather conditioning is crucial. The seats are nice, but when not taken care of they deteriorate quickly. When they were new, we saw a bunch of shrinking on the back seat on cars without tint and regular conditioning.

If you want to make power get an LS2 car, the large bore LS are so much better for making power, especially on a budget.

When I was working on them, options were limited for GTO specific upgrades, but where out there, just a little more expensive, and the cars have some idiosyncrasies, like the diff fluid, so just do your research and you'll be good.

They are awesome cars, capable and comfortable. I always thought of them as more BMW than GM, but with a reliable power train. I really love them.

06HHR (Forum Supporter)
06HHR (Forum Supporter) Dork
9/13/22 9:36 a.m.

In reply to Harvey :

I just missed out on a Yellow 2004 a guy was selling for $6000.  It may have been a scam or a basket case (or both) but it was gone before I could take a look at it.

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