Zeitgeist
Zeitgeist Reader
7/8/16 7:12 p.m.

Looking at getting a 07-13 Tahoe PPV (former police Tahoe) and can't find much info on what changed between the 06 and earlier GMT800 series trucks and the 07 and later GMT900 series. I found that they have rack and pinion steering and some increase stiffness in the frame but little else about what changed. I also would like to find online and/or in person auction of police vehicles in the MI/IN/OH or mostly OH area but google search shows little in that area either. I found the MSP vehicle test results which has some info but not much about the changes.

JohnRW1621
JohnRW1621 MegaDork
7/8/16 7:55 p.m.

Www.govdeals.com has a lot of Ohio auctions.

Chadeux
Chadeux Reader
7/8/16 8:43 p.m.

Biggest single change I know of is the 6L80E depending on what year you get.

dculberson
dculberson PowerDork
7/8/16 9:14 p.m.

They have them at the state of Ohio surplus vehicle auction every couple months here in Columbus. On the west side. They seem to sell for about $7000. I've been tempted by them before.

Auction info here:

http://www.dasapps.ohio.gov/surplus/nextauction.asp

It updates as the auctions come near. You can look at prior auction results with prices and pics here:

http://dasapps.ohio.gov/Surplus/previousauction.asp

dculberson
dculberson PowerDork
7/8/16 9:16 p.m.

Forgot to mention, these are retired Highway Patrol vehicles. Well maintained and around 100k-150k miles typically. It's an in-person auction, limited preview, and sold absolutely as-is. I've bought a couple vehicles there with some great and some limited success.

Zeitgeist
Zeitgeist Reader
7/9/16 1:17 p.m.

Thanks guys. Any idea what all has changed between 06 and 09+?

Stealthtercel
Stealthtercel Dork
7/9/16 8:59 p.m.

My google-fu is misfiring in regard to your specific question (and frankly I'd like to know too, so I'll keep looking), but I did come up with two info-nuggets of interest: first of all, the PPV Tahoe got the 6-speed auto only in MY 2010, and StabiliTrak only in MY 2011(!!).

Stealthtercel
Stealthtercel Dork
7/10/16 8:17 a.m.

Still looking for a point-by-point discussion of the changes from -800 to -900, but this review in a police magazine from 2007 may help: http://www.officer.com/article/10249982/the-2007-chevrolet-police-tahoe

Stealthtercel
Stealthtercel Dork
7/10/16 8:28 a.m.

Honestly not trying to be a post-whore here, but I did just find the GM press release for the GMT900 Tahoe PPV when it was new:

PRESS RELEASE:

Redesigned 2007 Chevy Police Tahoe Is The First SUV Designed From Its Inception As A Law-Enforcement Vehicle

The dramatically redesigned 2007 Chevrolet Police Tahoe delivers more power, enhanced ride and handling qualities, and more safety features than its 2006 counterpart. It also delivers a great deal of utility, cargo room, visibility and go-anywhere capability. But those attributes are only part of the 2007 Police Tahoe story. What distinguishes this vehicle is the fact that it is the first SUV designed from its inception as a law enforcement vehicle. That designation delivers a great many benefits to law enforcement agencies.

"Like the 1999 Chevrolet Impala Police vehicle – the first car in automotive history to be designed from its inception as a law enforcement vehicle – the 2007 Police Tahoe includes a number of law enforcement-specific enhancements. These enhancements were achieved during the design phase, with the result being that the Police Tahoe is available to law enforcement agencies with a number of features that set it apart from retail Tahoes," said Bruce Wiley, GM manager of law enforcement and specialty vehicles.

Compared to its retail counterpart, Police Tahoe is lower to the ground for improved handling, especially at high speeds. The front and rear suspensions feature stiffer springs and shocks and there's also a stiffer jounce bumper that is more ideally suited for police loads.

Police Tahoe also features a fully integrated electrical system for 2007, making it easier for upfitters to install such police-specific equipment as light bars and police radios.

"When we say that we design our police vehicles with the needs of law enforcement agencies in mind, we mean it. For example, Tahoe's electrical system is designed the same as the Impala, and both vehicles now function and upfit the same and can share some wiring harnesses. The result is easier upfits and lower costs to law enforcement agencies," Wiley added.

Enhanced powerplant

Police Tahoe's standard Vortec 5.3L V-8 engine receives a number of enhancements for 2007. It delivers more power – 320 horsepower (238 kW) and 340 lb.-ft. of torque (470 Nm). That's 25 more horsepower and an additional 10 lb.-ft. of torque than the 2006 version of this engine. The Vortec 5.3L represents the newest chapter in GM's small-block's 50-year history and features Active Fuel Management technology, resulting in improved fuel economy. When combined with other vehicle-wide features, including improved aerodynamics, the small-block V-8 helps give the Tahoe the segment's best fuel economy. Preliminary testing with 5.3L-equipped models shows unadjusted combined fuel economy ratings of 20.5 mpg on 2WD models.

The 5.3L Vortec can operate on fuel that contains up to 85 percent ethanol. E85 reduces reliance on fossil fuels and it's a clean, renewable resource that benefits farmers, because it's derived from corn.

The 5.3L V-8 is mated to a four-speed automatic transmission with overdrive.

Built for speed

Because of the high speeds typically encountered by law enforcement vehicles, Police Tahoe gets H-rated, P265/60R17 blackwall Goodyear RSA steel belt radial tires (compared to S-rated on production models). These are mounted on 17-inch steel wheels. Police Tahoe also receives heavy duty cooling – thanks to a higher capacity radiator and engine oil cooler –and heavy duty brakes with ABS, providing added safety for braking under specific conditions. For an additional level of safety, security and peace of mind, all 2007 Police Tahoe models feature a tire pressure monitor, alerting the driver if any of the tires begins to lose air pressure. A tire pressure monitor is also included in the spare tire and must be activated prior to being placed on the vehicle.

For underbody protection, Police Tahoe features a Skid Plate Package that includes a front underbody shield that starts behind the front bumper and runs to the first cross-member. The Skid Plate Package protects such vital vehicle components as the oil pan and other key drivetrain components.

A 26-gallon fuel tank, 160-amp alternator, a heavy duty 730 CCA battery with run-down protection and extended-life spark plugs are standard on Police Tahoe. Dual 730 CCA batteries are also available.

Superior ride and handling

The 2007 Police Tahoe is built on GM's new full-size SUV platform, which incorporates features such as a new, fully boxed frame, coil-over-shock front suspension, rack-and-pinion steering and an all-new, premium interior system that bolster the vehicle's comfort, quality and capability. Wider front and rear tracks enhance handling and lower the center of gravity for a more confident road feel.

Tahoe's engineers paid extensive attention to detail to ensure a quiet driving experience. It starts with a new, stiffer frame, which reduces vibrations transmitted to the passenger cabin. The strength and accuracy of the fully boxed frame also enable more precise mounting and tuning of chassis and suspension components, which also help reduce vibration.

Enhanced safety and security

The '07 Chevy Tahoe is designed to be among the industry's safest and most secure vehicles, with a 360-degree perimeter safety system of occupant protection and crash avoidance technologies. New features include a standard dual-stage driver and front passenger frontal air bags; optional roof-mounted head curtain side air bags with rollover protection for all seating rows; and front-seat safety belt pretensioners that are linked to the vehicle's sensing system to provide segment-exclusive deployment in rear-end crashes.

Crash avoidance is bolstered through enhanced design and driver control dynamics, such as wider front and rear tracks, as well as more responsive suspensions – including a new coil-over-shock front suspension design and new rack-and-pinion steering. The vehicles are built on a stronger and stiffer, fully boxed frame that contributes to enhanced crash energy management. The front frame section has been designed to optimize crush progression, resulting in improved energy absorption efficiency.

Enhanced utility

"Since September 11, 2001, the operating methodologies of police and fire municipalities have changed. They are looking at new and innovative ways to utilize police and emergency response vehicles, to carry more equipment, expand communication capability and address issues created by the need to carry tactical and hazardous material gear," Wiley added. "The Chevrolet Police Tahoe is capable of meeting the rigors of all these needs."

Even with its second-row seats fully upright, Police Tahoe delivers an incredible 60.3 cubic feet of cargo capacity for such items as gun cases, haz-mat equipment and other gear and materials that law enforcement officers may require to do their jobs. The second-row seats may be individually folded forward, adding even more cargo capacity. Second-row seats come with inboard headrests and reclining seatbacks. With both second-row seats folded, Police Tahoe delivers a cavernous 108.9 cubic feet of cargo capacity.

Fiscally responsible

A number of municipalities are turning to vehicles such as the Chevrolet Police Tahoe because it's a fiscally responsible proposition. Although the initial cost is higher than that of a sedan, the increased capability and durability, longer lifecycle and higher residual value can combine to make Tahoe the more cost-effective choice, said Wiley.

The Police Tahoe joins the Chevrolet Impala Police Vehicle, Chevrolet Tahoe Special Services and Chevrolet Express Prisoner Transport Van in GM's lineup of law enforcement vehicles. Every vehicle GM offers to law enforcement agencies is "road ready," meaning they can be delivered completely equipped and ready for use.

patgizz
patgizz GRM+ Memberand UltimaDork
7/10/16 8:50 a.m.

be very wary of the AFM 5.3L and if you buy one, plan to delete that system immediately if it has not been done yet.

Zeitgeist
Zeitgeist Reader
7/10/16 9:49 a.m.
patgizz wrote: be very wary of the AFM 5.3L and if you buy one, plan to delete that system immediately if it has not been done yet.

With so many PPVs on the market with 100K miles and more can it be that GM or the agencies changed the AFM system either through mechanical or electronic means? My limited understanding is theat AFM issues mean lifter change or a reflash to eliminate AFM from activating, True?

chiodos
chiodos Dork
7/10/16 10:17 a.m.

In reply to patgizz:

I saw afm and got turned off...dads been looking for something newer to replace his 300k mile expedition and always wanted a tahoe but were more expensive than the fords. This sparked and interest for me but i know he's definitely not going to want to do a cam change and ecu reflash just for the thing to be reliable as his old ford.

patgizz
patgizz GRM+ Memberand UltimaDork
7/10/16 10:56 a.m.

i doubt gm would eliminate it. their warranty work was "fix the broken crap and let it go out the door even though it probably put metal in the oil"

but if you get one that isn't broken yet, number one deactivate it in the tune and number two swap out the cam/lifters/valley cover. someone just posted their suburban in the last week that did it. in our case i had no knowledge of the issue until my wife came home with a knocking 5.3. when i researched it i got sick, and when i looked for engines a 120+K mile one was $3000+ from copart. so i put in a 4.8 without AFM instead and deleted it from the program with hptuners. the thing gets mad if you remove the hard parts and don't remove the programming.

scottdownsouth
scottdownsouth Reader
7/12/16 10:07 a.m.

like this ? https://columbia.craigslist.org/cto/5643030105.html

Bobzilla
Bobzilla UltimaDork
7/12/16 10:55 a.m.

Dad's 07 AFM has almost 170k on the clock. Still works like a charm.

Ranger50
Ranger50 UltimaDork
7/12/16 11:30 a.m.
patgizz wrote: someone just posted their suburban in the last week that did it.

That would be mine. I did it after reading about patgizz having issues and researching a bit farther.

All in all, I have about 20hrs of my time in it and $1500, iirc. Most of the expense was the HPTuners box and software for $650 from Summit. I also put a TrickFlow cam in it while there for $287. Headstuds were SpeedMaster for $100, GM lifters for $125 from Jegs. Headgaskets are GMPP/Chevrolet Performance for $35. I also upgraded to some Summit replacement pushrods for $35(?) and ARP balancer bolt for $35. The rest was new timing cover, deleted VVT, valley cover for a 4.8, cam timing gear, LS2 "tensioner", lifter retainers from GMpartsdirect. Then it was some various gaskets, water pump and exhaust manifold, from RockAuto.

This can be done for under $800 if you shop just right and go almost back as the factory built it. I overbuilt mine just to be ultra safe if and when I decide to pony up another $4500 for boost, unless I find a way to piece it together cheaper. Like I wonder if I could eliminate the air box for a water IC and tank on the other side where the battery used to be on the previous generation...

Most of my ideas on cheapness came from the sloppy mechanics page that is out there.

novaderrik
novaderrik UltimaDork
7/12/16 11:42 a.m.

Pretty sure 07 was when the Tahoe and Suburban went to a 4 link rear suspension in place of the trusty leafs thar worked perfectly well since the end of the last ice age.

81cpcamaro
81cpcamaro Dork
7/12/16 12:40 p.m.
novaderrik wrote: Pretty sure 07 was when the Tahoe and Suburban went to a 4 link rear suspension in place of the trusty leafs thar worked perfectly well since the end of the last ice age.

GMT-800 Tahoe and Suburban 1500s have a 4-link rear suspension. 2500 Burbs still had the rear leafs.

PHeller
PHeller PowerDork
7/21/16 1:49 p.m.

Anymore thoughts on this? Did any of the GMT900 series trucks not have the AFM?

Ranger50
Ranger50 UltimaDork
7/21/16 2:30 p.m.
PHeller wrote: Anymore thoughts on this? Did any of the GMT900 series trucks not have the AFM?

As far as I know, no.

NGTD
NGTD UltraDork
7/21/16 3:02 p.m.
PHeller wrote: Anymore thoughts on this? Did any of the GMT900 series trucks not have the AFM?

I am pretty sure that only the 5.3L GMT-900's have afm.

The 6.0L and 4.8L trucks don't have it.

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