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  1. C10MixMaster

    change from mechanical to electrical speedo?

    im not 100% sure, but i think the signal from the speed sensor is different between the 86 cruise III system and the later electro motor system(The output of the cruise III VSS Buffer Amplifier is a square wave with a frequency of 0.556 Hz/MPH, and the elecrtro cruise system uses a 4000 pulse...
  2. C10MixMaster

    change from mechanical to electrical speedo?

    I've done that swap. transmission needs to have a reluctor in place of the drive gear and a pick up inplace of the driven gear 700r4 the pieces are readily available, im sure they are available for the manual box or th400 also. You will also need a DRAC module its a little white box that...
  3. C10MixMaster

    need power window help

    here's the link to the 85 service manual section 10-14 has the power window regulator. and it is a pain in the ass to get it out. http://www.mediafire.com/file/9huc2634dnvtbq9/ST_382_85_1985_Chevrolet_GMC_Light_Truck_Service_Manual_CK_10_30_Only.pdf/file
  4. C10MixMaster

    What is this bracket?

    probably smog pump bracket positioned by the fuel pump. edit definitely a smog pump bracket
  5. C10MixMaster

    What should I include in my emergency tool set?

    ignition module , jumper wire with alligator clips, test light
  6. C10MixMaster

    Modern rearview mirror in a square

  7. C10MixMaster

    Is a 85 700r4 ok?

    typically you want a 88 or later it has the auxiliary valve body and most all the improvements they did on the 700r4 to make them reasonably reliable. the aux valve bodied cases have the st louis arch in the casting making them easy to identify. 82-87 had a bad reputation however if updated...
  8. C10MixMaster

    Best place or brand for everything electrical control in the steering column?

    2 probabilities 1 PO mess up the columbus trying to fix them , the bearings and linkage do go bad and the bolts are known to come loose. 2 Someone tried to steal the truck and the bust out the left side of the column to bypass the lock.
  9. C10MixMaster

    Intermittent wiper controller?

    here's the controller
  10. C10MixMaster

    Frame flex near steering gearbox???

    not sure about the fix on the rivets but my 76 2wd had the frame crack at the steering box.
  11. C10MixMaster

    Wiring question

    personally i would rework the harness to suit my needs. Now fixing a previous owners chop job may be another story.
  12. C10MixMaster

    What is this connector?

    2 p/s , 2 brake and 2 evap lines for a dual evap canister system.
  13. C10MixMaster

    What is this connector?

    brake imbalance switch / brake warning light.
  14. C10MixMaster

    78 K-10 Dual Tank Install

    1977 wiring 1979?- 1986 1987 with intank pumps
  15. C10MixMaster

    Axle question 1/2 and 3/4 ton

    pretty sure the axle on the 3/4 that sticks through the wheel is way bigger than the hole in the 1/2 ton wheel . No go.
  16. C10MixMaster

    Random Diff Questions

    I cant see someone setting up a diff that bad, is it possible the pinion bearing is loose enough to let the pinion climb and hit the carrier.
  17. C10MixMaster

    Tuning Advice Needed

    the leaky fuel plugs are an issue mostly on the early Qjets, gm changed how they installed them and for the most part they dont leak. If you think that's your problem you can pull the carb make sure there's fuel in the float bowl and observe if its leaking. Evaporation is probably your problem...
  18. C10MixMaster

    What have you done to your square lately??

    should be able to pull the relay and run a jumper to drain the tank.
  19. C10MixMaster

    Raw Fuel Coming out the Exhaust?

    If you just start it and move it and then let it sit, your plugs could be carboned over and fouling out. I would take it for a drive and romp on her a bit to blow out the carbon before i did anything else. Next i would do plugs if it didn't come to life, only use factory type plugs No...
  20. C10MixMaster

    Kill switch ideas?

    I have one in mine it's a momentary switch that has to be held down to start or it disables the starter. these trucks are far too easy to steal and i have way too much money and time to lose mine. I might add a second one to kill the ignition. In the past on my gmt400 the lowlifes popped...
  21. C10MixMaster

    Refurbishing Dash

    I've been thinking along the same lines. I got a extra dash from the boneyard that i've been playing with just in case I totally screw it up lol. I wanted to add gauges to the dash and blend them in. So far I have peeled the old vinyl off, it peels off pretty easy. Filled the voids with...
  22. C10MixMaster

    Smog Regulations

    acord according to the 78 options manual for a 350 in a c20 see here and download for specs https://www.gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Chevrolet-Trucks/1978-Chevrolet-Truck.pdf see pages 165-167. california emissions PCV positive...
  23. C10MixMaster

    Oil Pressure Gauge problems

    with the 210 marking i bet its the later version. so try looking for one from a 78 and up. 78 and up should all be the correct resistance. can't remember the year but around 78-81 the switched from a 1/2 sender to the smaller 3/8 sender , unfortunately I didn't add that to my notes , those...
  24. C10MixMaster

    Oil Pressure Gauge problems

    just edited my first response. :33:
  25. C10MixMaster

    Oil Pressure Gauge problems

    For Truck Years: 1978 - 1990 (Please note: although factory oil pressure sending units are available calibrated to 60 PSI, 80 PSI and 100 PSI gauges - 60 PSI is the most common calibration. To determine which sender you have, the pressure calibration is stamped into the hex nut at the base of...

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