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  1. Turbo4whl

    Gm 12 bolt gear pattern help. ?

    Oh, then reset the back lash.
  2. Turbo4whl

    Gm 12 bolt gear pattern help. ?

    So your pinion needs to move closer to the ring gear. Keep in mind the gears need to be loaded when checking the pattern. Easiest way I have found, use a pry bar between the housing and the outside edge of the differential or the outside edge of the ring gear. Spin the pinion making the diff...
  3. Turbo4whl

    Gm 12 bolt gear pattern help. ?

    Welcome to the forum. Please note the drive side of the ring gear. Your pictures are showing the coast side. The top picture is what you want, drive side. Coast side is just that, coast side not important.
  4. Turbo4whl

    How close are the aftermarket doors?

    The reason I asked is because I have 2 NOS GM doors, and 2 more new doors that I don't know if they are GM or aftermarket. Yes, the body guys at work used to re-skin doors just how you described. Now the doors just get replaced, it's quicker. Less people here in the shop, "time is money."
  5. Turbo4whl

    How close are the aftermarket doors?

    What are the most noticeable differences between factory replacement and aftermarket doors?
  6. Turbo4whl

    What is this? Asking for a friend

    Torque converter lock defeat switch? Unlocks the converter, when you apply the brakes.
  7. Turbo4whl

    Replaced Radiator, but no heater hose hole!!

    This could work, but may not be an option for Eric. Either hose routing will work.
  8. Turbo4whl

    No line pressure to rear disc conversion, no prop valve

    Welcome new member! You need to read some of the braking system problems and solutions discussed in these forums. Wrong brake master cylinder made for front disc and rear drum?? 1/4" line to the front disc, 3/16" to rear drums. Front disc needs more flow, rear drums need higher pressure...
  9. Turbo4whl

    Rear axle replacement

    The side and spider gears cavitation is because the gears move in and out of the oil as the diff spins. They push and pull off creating the vacuum that causes the cavitation. The ring and pinion gears are hypoid cut and they slide against each other.
  10. Turbo4whl

    Rear axle replacement

    Okay Taylor, since you brought this old thread back up with some info I didn't know, it also explains why the G80's still failed. Think of the operator that was accustomed to driving with the G80, then it didn't work. Now trying to move the vehicle on ice or whatever and the speedo says 30MPH...
  11. Turbo4whl

    Cardboard utility box upgrade.

    Google search for the list. I also found charts, but I could not save or download. For the list I posted, just copy and paste in a word doc. Then you can print it if you want. If you need help, let me know. Google is your friend. I know some people don't like Google because it will track you. I...
  12. Turbo4whl

    Is there a replacement or workaround for the AC Thermac vacuum thermostat?

    If you find it, and want it, you need to buy it immediately. https://dragtimes.com/parts/NEW-GM-AIR-INTAKE-TEMPERATURE-SENSOR-OEM-8997493_160921876185.html
  13. Turbo4whl

    Is there a replacement or workaround for the AC Thermac vacuum thermostat?

    Try this link, says in stock: https://borthautoparts.com/parts-products-catalog/chevrolet/1990-s-chevy-up-car-truck-parts/1992-95-gm-sensor-air-cleaner-gm-no-8997493/
  14. Turbo4whl

    Cardboard utility box upgrade.

    7th digit in the vin. 1973-80 Vehicle ID Number (VIN) All 1973-80 series 10 and 20 have a portion of the VIN number stamped on the engine and the transmission. This identification number consists of the division number, model year, assembly plant and the vehicle assembly sequence number. The...
  15. Turbo4whl

    Cardboard utility box upgrade.

    Okay Smiley, what truck assembly plant was your truck built at?
  16. Turbo4whl

    Aux Battery Tray local

    @KCKKen I was wondering about this too. ^^^
  17. Turbo4whl

    Hub and rotor help

    The rotor should never be loose. On some hub rotor assemblies the studs pressed in hold the rotor tight. On another style the rotor sits on the studs and when you bolt the wheel on, the wheel and lug nuts hold the rotor tight, no movement.
  18. Turbo4whl

    So can someone tell me . . .

    6 lug rallies available from GM in 3 different widths. Don't know them all from memory but definitely 3 sizes.
  19. Turbo4whl

    So can someone tell me . . .

    How wide do you believe those rallies are? @Buicknut 5 lug rally wheels were available first for 2 wheel drive trucks. The 6 lug 4WD rally wheels a few years later 1975 or '76. Some 1980's 4WD Suburbans had wider rallies, for sure 1985.
  20. Turbo4whl

    What’s IT Worth? (Post all “what’s it worth threads here)

    Sold the 1974, garage kept 40 years Jimmy/Blazer top. Got $1600 for it and some other small stuff! He brought 2 helpers and we dug it out of a full garage.
  21. Turbo4whl

    Got a cast iron point type distributor to rebuild, questions.

    Delco uniset points are an upfit to that early dizzy.
  22. Turbo4whl

    Bulb with black plastic wire

    I was slow to respond, David has it ^^^
  23. Turbo4whl

    Bulb with black plastic wire

    If it is on the right side of the instrument cluster, it is fiber optic line to light up the ashtray. On the left side it lights up the wiper switch (older model than the '90) Early squares had a fiber optic ribbon to light up the wiper switch.
  24. Turbo4whl

    horn(s)

    If the horn buzzes when hooked to power, you can fix it. Horn off the truck, add 12V and a ground wire. While conected to power, tap the horn on the concrete. Horn will start to beep after a couple hits. Couple more hits it will get louder. Stop banging.
  25. Turbo4whl

    Disconnected mystery wire in 1982 C10

    We all call it a proportioning valve, but as Rick stated it is a combination valve. Two separate functions, first it will put the brake light on if you have a major fluid leak, front or back. Rust and corrosion can put the light on over time (valve fails) without any fluid loss. The second...

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