International SyTy Registry

GMC Syclone, Typhoon, & Sonoma GT History and Data

PROTOTYPES & CONCEPTS

ImageConcept Syclone #1. Chicago Autoshow debut (1989)

ImageConcept Syclone #2. Detroit Autoshow debut (1989)

ImageBuick Syclone. Privately owned.

ImageCodename “Lil’ Red Truck”.  During the Syclone’s development, there was a debate to introduce it as a S10 version. Chevy wanted it while GMC refused it….after all, they were in charge of the concept and platform. Before the idea was completely squashed, the development team threw together this 1989 S15 complete with custom 16″ steel wheels with correct offsets to accommodate the Safari AWD driveline and installed a full-on Syclone drivetrain. The truck had a bench seat, manual windows, an a column shift. The last known whereabouts of this truck was in Virginia in 1999 with around 222k on it!

ImageChuck Mountain’s Personal Truck. 3.8 liter engine and special hard tonneau cover custom made by Leer Corp. Stolen, recovered and then scrapped in 1992. Proto #001 One of the 5 that survived. Maroon colored.ImageCodename “Old #9”. Sierra Classic S-10 Solid Grey with no cladding. Naturally Aspirated 4.3 liter centerport engine with Column Shifter. AWD with Syclone Rims. Proto #009

ImagePrototype #015 Syclone. Engineering Truck. The truck has PAS 001 on the side windows and the front of the rear-view mirror. Interior:

    [*]Console is yellow, made out of a prototyping plastic. [*]It does have the Syclone seats. But that is the only place (except for the intake) that it says Syclone. [*]The interior carpeting is still the 4×4 carpet, with the hole in the carpet for the 4×4 shifter. [*]It does not have the Sunbird Turbo dash, instead it has some other pontiac dash. [*]It has a turbo gauge, tach, 140mph speedo, and all the other things.
Engine:
    [*]The engine is basically that of a stock Syclone, with a few exceptions. [*]The cam is slightly larger, the pistons are from a turbo 350, and the Turbo is a garret, instead of mitsu. [*]The intercooler is all custom, built by garret. [*]The ECM sits in the glove box, and is entirely custom.
      [*]It can be reprogrammed on the fly, using a laptop computer. [*]The chip stores “defaults” and can be replaced.
    [/list] The engine has been modified from PAS from it’s original form. It is believed that the intake, turbo, and intercooler have been replaced with semi-‘stock’ parts. The originals are in Marty’s hands, or so we think. Exterior:
      [*]The vehicle does not have any ground effects and has S-15 steel bumpers. [*]There is a est 350lb weight welded to the rear bumper to keep the rear end down while pulling a Towing Dyno. [*]In the bed of the truck there is a gas cooler box. This cools the gas using NOS.
    Drivetrain:
      [*]The transfer case came out of the AWD Astro Van, the Front prop shaft was developed at GKN in Auburn Hills, Michigan. [*]The front differential is not that of a bravada, it is a normal 4×4 diff, that has had the shift mechanisms removed.
    We believe this truck was donated to a church group, which then raffled the truck off.

    ImageUnknown Syclone. Wrecked in testing.

    ImageProto #010. Totaled into a wall on 696 Highway.

    ImageJim Stokes’ baby. Was to be ready every week for Magazine testing. Fiberglass air duct. Fiberglass Cladding. Proto #019. Became the PPG pace truck that GM still owns.

    ImagePre-production Syclone. Owned by Mike Poccobello. Used on horse farm as a work truck. Production appearance. Sold privately in 2002. Proto #018 – “Queen Vehicle”

    ImagePre-production Syclone. Production appearance. 1992 style mirrors. Sold privately in 2002.ImageCodename Queen Bee. #1 Full Production Syclone, Charcoal with Black Cladding. Used in all Dimensional work, Suspension work/testing and to fit all prototype parts. Never Left the Block, only driven around GM grounds.

    ImageChevy Syclone. Bench Seat. Column Shift. Roll-up Windows. No Cladding. Forrest Green/Light Gray Cloth. Production Syclone Wheels with Corvette Center Caps.

    Image92 Pre-Production Syclone. 30,000+ miles. Sportmachines Video Truck. Privately owned. Located in TN. Currently for sale

    Image92 Pre-Production Syclone. Brochure Truck. Privately owned. Located in SC.

    ImageFirst Production 1992 Syclone Vin #0001. Purchased by Maldaver when PAS closed. Currently located in NY. Never Registered.
    Located in a Junk Yard in NY.
    Bought by Maldaver when PAS closed.
    No VIN # stamped on the frame.
    It was bought from Maldaver (now closed) for $600.00
    Now it just sits to rot.

    ImageConcept Typhoon. The name “Typhoon” hadn’t even been authored at the time of this drawing, so “Syclone” was used.

    ImageTyphoon Clay Model. All the fascias and cladding were made of clay. The front turn signals and fog/driving lamps were made from paper and just colored or rendered to appear real. Rear Spoiler and 1991 Syclone mirrors.

    Image1991 Prototype Typhoon. GMC Promotional video vehicle.

    General Information:

    Was a 91 Jimmy 4X4 converted to a Typhoon.

    Painted aspen blue and metallic gray, truck was originally black. Door jams, fire wall, etc. still black.

    Has small amount of blue over spray on undercarriage.

    Has 4 dimples in body from using interior screws that are too long.
    (3 above windshield and 1 passenger side in front of rear window)

    No build sheet in glove box.

    Has Jimmy GVWR sticker in door jam.

    92 Typhoon style grill, door guards and power mirrors.

    Has 91 Jimmy rear window (steel frame) and no rear wiper. Windshield washer bottle is 91 Jimmy.

    Silver Typhoon decals and tailgate decals are in different locations:
    “Typhoon” is 4-1/4” from side and 5-1/4” from bottom (93 Ty is 1” and 3”).
    “GMC Truck” is 6” from side and 5-3/4” from bottom (93 Ty is 1”and 4”).

    Has no license plate lights.

    Interior Information:

    91 Jimmy seats, door panels and steering wheel.

    Has Typhoon style gauge cluster and gold “typhoon” glove box decal.

    Has Typhoon center counsel but is mostly smooth and some very rough spots looks like heat or chemical damage on the top.

    Rearview mirror has lights, but they do not work.

    Gear display has orange tint (from a corvette).

    Misc. screws missing from interior.

    2 extra wires going to the DLC. Lots of extra wires going to the fuse box. Missing fuse box cover.

    Gas pedal has extra rod.

    Missing trim pieces under dash.

    Dash and side interior pieces appear to have been removed.

    Edge of rear interior pieces when look from open door have been cut and not repainted.

    Has Cassette am/fm radio with EQ.

    Rear windows tinted very dark. Cuts in glass on both side rear windows

    Mechanical Information:

    Has different exhaust.

    Wheels are highly polished and were hand finished, not machine finished like standard production wheels.

    Unknown prom.

    Has no front prop shaft.

    Shocks are painted black (believed to be GM). Rear springs have “#24” in yellow marker.

    Gas tank has large sump welded to the bottom. Gas tank straps have large bracket welded hanging towards the ground.

    Has Syclone rear end (ABS wires and backing plate flange is different).

    Trans hump is painted gray primer.

    Torsion Bar has white index style card with red marker that reads “unique part 6.5 R” (left side reads L at end) Torsion Bars same length but measure 1.10” in dia. (93 Ty is 1.05”). Front end 2″ lower than stock vehicles.

    Motorcraft gas cap

    Image1991 Prototype Typhoon “Shamu”

    Image1991 Prototype Typhoon. No cladding, Jimmy interior.

    ImageJimmy Z-34. Full 1993 Typhoon interior. No cladding. Dubbed the ’94 prototype.ImageAll Prototype 4 door Typhoons

    ImageChevy Typhoon. Full typhoon pkg, with Corvette center caps. Used to market test the Typhoon pkg in Europe where GMC had no license at this time.

    ImageGMC Sonoma GTX Prototype

    Image92 GMC Sonoma GT Extended Cab 4×4. Only one ever built, also only Sonoma GT which is 4×4, Built ’93 Production year. Owned/Driven by GMC executive.