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· Need another ZR2!
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· Game Pop. Control Agent
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Question...I'm a newb when it comes to the "lil" trucks but I just got a 2000 Sonoma 4x4 xtended cab with the 4.3.
It has 235's on it right now, the door says it supposed to have 31's.
When I was checkin the truck over I got a bit confused. Did these come from the factory with a 3" body lift or did someone do that afterwards?

Any body lifts would be aftermarket. Previous owner put that on.
 

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Any body lifts would be aftermarket. Previous owner put that on.
So...dump off the 31"s and go for 33"s...lol.
What are common upgrades for the 4.3? I'm not much of a bolt on guy, I prefer real internal HP and knowing this is nothing more than a v-8 with 2 cylinders chopped off it wouldn't be hard to rework. I'm just curious as to different ignition set-ups people have had good luck with.
 

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hi ,i recently found this tread by searching on google and i can answer to some question about the ZR2 fender compatibility and the biggest difference between standard and ZR2 suspension.

in some case you can install any ZR2 flare on any s-10/sonoma/blazer/jimmy

for the rear fender flare its a bolt-on upgrade you have to drill few hole for the mounting bracket or you can only drill 2 hole 1 for the front end of the fender and one for the rear end of the fender all other can be screw on the inner lip whit pop-rivet or bolt/metal screw.No modification required on the rear are all exactly same(no cut/no modification).

the only place they have a difference is in the front. ZR2 have specialy cuted
front wings for larger tire and fender.You can install ZR2 flare on standard front wings blazer by two way.

1: by modifying the the trim of the fender for fit whitout have to cut on the center of the lip of the front wing .no Zr2 bracket required use bolt and screw for fix the fender and its done.
2: by modifying the front wing for the ZR2 flare .you have to cut in the front wing for keep the fender whit no modification. (no one can really see the difference in this 2 way except a ZR2 owner.

we have an other solution for install ZR2 front flare is by buying brand front wings for a blazer ZR2 and install it on your standard blazer/S-10 and install the ZR2 fender. (by doing this solution no novice ZR2 owner can be affirm so if its a real ZR2 or not)

after some question about the difference of a ZR2 suspension and standard its not by telling the suspension is not the same.its true only at 50% for the front end.only the lower arm can be more longer than a standard blazer suspension,all other part remain the same(Yes you can install a 2004 ZR2 upper arm in a 86 blazer bolt-on)the only way to see the difference is on the frame dirrectly.ZR2 frame are more larger on where the uper arm bracket are welded (frame are 2 time the larger of a standard blazer front frame.for fit the complete front suspension of a ZR2(except the front upper arm is by finding front extended table)
What exactly has to be cut/modifyed to put zr2 flares onto a non-zr2 blazer? How much difficulty would be involved (Only reason im really interested is that i might be able to get of factory flares cheap)
 

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It's prolly already been done, but I found this on wikipedia and found it amusing...

The following factory-installed features are what made the ZR2 standout from other 4x4 trucks offered in the S-Series class.
  • Ladder Type Frame with Modified Mounting Points
  • 100mm wider track (3.9 inches wider than regular S-10)
  • Increased Ground Clearance (Approx 3" over Regular S-Series 4x4)
  • Enhanced front (7.25" ring gear) and rear (8.5" ring gear) axles w/ 3.73:1 rear-axle ratio
  • Larger wheel and axle bearings
  • 31 x 10.50" BFG A/T Tires (Pickup), 31 x 10.50" BFG Longtrails (Blazer)<LI sizset="4" sizcache="0">Fender Flares
    • Spectra Gray on the Chevrolet Models, despite body color. Body color on all GMC Models.
  • 46mm gas pressurized Bilstein Monotube shocks
  • Rear Track Bar (Pickup), Front Anti-Sway Bar (Blazer)
  • Skid Plates [1]
  • Front/Rear Disc brakes (1998-2005) , Disc/Drum brakes (1994-1997)
  • Full Size Spare Tire
ZR2 Facts

  • Not all S-Series 4WD's are ZR2's, and not all ZR2's are 4WD's. From 1994 - 2003 all ZR2 equiped S-Series were offered only with the 4WD package. In 2004 and 2005 GM offered a ZR2 package with the 2WD 2Door Blazers and Jimmy's.
  • The ZR2 option was never offered with any of the Crew Cab, 4-Door Blazer, or GMC Jimmy (USA) models. [2]
  • The S10 ZR2, GMC Highrider, and many Blazer ZR2's feature Insta-Trac (three-button) 4WD. The Blazer ZR2 was also offered with the option of Auto-Trac (four-button) 4WD.
  • ZR2 equipped S-Series vehicles are typically worth one to two thousand dollars more than a non-ZR2. Therefore ZR2 decals are commonly used on non-ZR2 trucks and blazers in an attempt to trick an uninformed buyer into spending more money. This practice is especially common among online marketplaces and independent Auto dealers. ZR2 verification can be done by checking the RPO tag affixed to the inside of the glove compartment.
The Life of the RPO ZR2

  • 1994 - ZR2 package is introduced with the Regular Cab 2nd Generation S-Series Pickups
  • 1995 - ZR2 package expanded to Extended Cab S-Series Pickups
  • 1996 - ZR2 package extended to 2-Door Blazer models. [3] 3rd door was offered on extended cab models.
  • 1998 - Disc brakes are now standard on the Front and Rear wheels. Interior updated along with front grill and headlights.<LI sizset="11" sizcache="0">1999 - GM replaces the Aluminum Skid Plates with Composite Skid Plates. Side mirrors are updated. (much stronger)
    • Last model year the ZR2 option was offered on a regular cab pickup.
  • 2001 - ZR2 package extended to Chevrolet Tracker
  • 2002 - ZR2 Trackers were upgraded to LT Editions, offering optional leather upholstery<LI sizset="12" sizcache="0">2003 - (sometime during production year) ZR2's start shipping with General Ameritrac tires instead of the classic BFG's.
    • GM discontinues S-Series Pickups, this is the last year that the ZR2 is available on a pickup
    • A ZR2 Jimmy surfaces in Canada. This came as a surprise because it was unavailable in the USA. [2]
  • 2004 - ZR2 only available on Blazer models. In a shocking move, for the first time the ZR2 is offered with a 2WD model.
  • 2005 - This is the last year for ZR2 Blazers (USA) /Jimmys (Canada)
    • GM discontinues ALL remaining S-Series models, ZR2 is phased out.
Though several inquiries were made by interested parties, the ZR2 production numbers are unknown.
Woes of "ZR2 Specific" in the Aftermarket

Unlike many automobile lines, especially those in the Four-Wheel Drive category, the ZR2 did not garner much aftermarket support. One of the reasons could be a simple lack of knowledge by aftermarket companies about the differences between the ZR2 and the Regular S-Series models and the ZR2 incompatibility of their S-Series applications. Or simply because it wouldn't be cost effective to pursue ZR2 Specific applications due to the scarcity and seemingly low production numbers of the ZR2.
During its production only a small handful of lift options were available to ZR2 owners:
  • 5" BDS Suspension Lift
  • 6" Superlift Suspension Lift
  • 2" Superlift Suspension Lift
  • 5" Trailmaster Suspension Lift (the TM5 was shortlived, and has been discontinued)
  • 2" Performance Accessories Body lift (1998+ Models)
  • 2" BDS Body Lift (1998+ Models)
  • 3" Performance Accessories Body Lift (Pre-1997 Models)
Another hindrance was the Wheel Backspacing (6") and size of the wheel wells. Generally tire size could only be upgraded 1-2" (diameter) without having to make modifications by way of cutting. Many enthusiasts did find that certain Suspension/Body lift combinations made way for more room thus requiring less cutting, however this still didn't allow for a tire larger than 33x10.50" (this is the subject of much debate within the ZR2 community).When it comes to wheels many are available with the correct bolt pattern, however the majority do not have the correct backspacing. Thus leaving very few Tire/Wheel options.
With the ZR2 having a wider track, many accessories that "bolt-on" to the frame had to be ZR2 specific. This meant that non-ZR2 Safari Bars, Brushguards, and Receiver Hitches that are "S10 Compatible" required special unorthodox modifications in order to be installed. These modifications often required a skilled welder or machinist in order to ensure safety hadn't been compromised.
Compared to the regular S-Series, the ZR2 was equipped with a "beefier" front end consisting of components that were supposed to be built stronger in order to sustain the punishment an off-road vehicle. Despite this, the front end components like Ball Joints, CV Joints, CV Axles, and Idler/Pitman arms were susceptible to premature wear & tear and failure. Again the lack of aftermarket support comes into play because many of the Discount/3rd Party Auto Parts retailers do not recognize the difference between a 4WD S10 and a ZR2. This meant that ZR2 owners were left with no option but to make their repairs with the same weak (but expensive) parts available from GM. This went on for years until a couple aftermarket part companies took notice to the ZR2 and began manufacturing ZR2 Specific replacement parts. However due to their small distribution, finding the parts in a local store is near impossible. Therefore purchases are usually made via the internet.
 

· Game Pop. Control Agent
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Mine too, but its upside down.
 

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ZR2 Facts

  • Not all S-Series 4WD's are ZR2's, and not all ZR2's are 4WD's. From 1994 - 2003 all ZR2 equiped S-Series were offered only with the 4WD package. In 2004 and 2005 GM offered a ZR2 package with the 2WD 2Door Blazers and Jimmy's.
  • The ZR2 option was never offered with any of the Crew Cab, 4-Door Blazer, or GMC Jimmy (USA) models. [2]
  • The S10 ZR2, GMC Highrider, and many Blazer ZR2's feature Insta-Trac (three-button) 4WD. The Blazer ZR2 was also offered with the option of Auto-Trac (four-button) 4WD.
The Jimmy ZR2 also could have the 4 button Auto-Trac 4wd.
 

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Couple other quick notes, the front leaf spring eye on ZR2 Blazers is below the main leaf while Non-ZR2 blazers have it above the main leaf

The front get's the extra width from the frames being different. ZR2's the frame juts out about an inch where the upper a-arms mount and non-ZR2's the frame is recessed about an inch at the same spot.

I don't have any pics but hopefully those descriptions make sense.
 

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I've been reading through all of this and only one red flag has come up for me is
that a lot of ZR2's have a third door. My truck is a two door, how rare is that on
ZR2's if it is?
94 only offered 2 door. 95 extended cab was an option. I have 2 94 standard cab
 

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