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  1. Matt69olds

    Under Dash Wiring Mystery

    The green box is the VSS (vehicle speed sensor) buffer. Don’t throw it away, you will create more headaches. Look for a ribbon cable that runs up to the speedometer. One the opposite end of the box, you will find a place for the plug with the pink, black, and yellow wires. The speed buffer...
  2. Matt69olds

    1986 Automatic Transmission Leak

    The seal is called the manual shaft seal. Some people call it the selector shaft seal. Go to your nearest transmission shop, chances are they will have one. There is a cheap tool you can buy to replace the seal without removing the transmission pan, otherwise you need to drain the fluid and...
  3. Matt69olds

    Avs2 problems

    Take off the distributor cap and rotor, make sure the advance weights are free to move and return to their resting spot. If you adjust the idle speed with the weights slightly advance, when the return to their resting spot the idle speed will be lower. If after driving the truck the weights...
  4. Matt69olds

    Engine oil lines.

    I’ll leave the oil cooler block fitting discussion the the Chevy experts. Assuming the fitting can be removed from the block, anyplace that makes hydraulic hoses can probably make exactly what you need. As someone pointed out, I wouldn’t drive the truck like that. If you have a line come...
  5. Matt69olds

    Help! My coolant temp heats up fast in idle or slow-moving traffic (around 210F+) then decreases when I start driving (around 170F-190)

    First, 210 at idle isn’t terrible. If that’s as hot as it gets, I’d say you’re trying to fix a problem that really isn’t there. Make sure the fan clutch works as it should, and the shroud fits well. You can easily test the fan clutch, throw a heavy blanket over the front of the grill (make...
  6. Matt69olds

    Electric fuel pump

    Without a doubt. Holley has enough quality control issues on their own, you don’t need the added headaches of an external fuel pump.
  7. Matt69olds

    Electric fuel pump

    Are you SURE the float level is correct? It needs to be just below the sight glass window, if you shake the truck fuel should just dribble out the window. Once you’re sure that’s good, drive the truck until the engine is good and hot, then shut it off. Wait a few minutes, check the float level...
  8. Matt69olds

    Modern trailer controller wiring details

    Make sure the controller signal wire is connected to the white wire of the brake switch.
  9. Matt69olds

    1987 R10: TH400 to 200-4R swap (mostly wiring??)

    The computer won’t care if the kickdown wire is disconnected. Somewhere there is a switch on the carb or throttle that sends power to the kickdown solenoid. I think on some of the later trucks the computer sends a signal to a relay which disengaged the A/C compressor and energizes the kickdown...
  10. Matt69olds

    1987 R10: TH400 to 200-4R swap (mostly wiring??)

    Look up TCC wiring for a 700 swap. The TCC works and installs in basically the same way on a 200R4, the pressure switch is obviously in a different location on the valve body.
  11. Matt69olds

    A Technical Comedy [Only After the Fact]

    Friend of mine locked his keys in the ignition in his Chevelle. He crawled under the car, pushed off the sheetmetal he had covering the hole in the floor, reached up and pulled them out of the ignition. Many years ago, I attended the Woodward Avenue Dream Cruise in Detroit. Dumbass me left...
  12. Matt69olds

    Overheating 87 TBI

    How hot does it actually get? Put a real gauge on it, and see what happens. You may be pleasantly surprised. When does it overheat? Idle? Going down the road? Are all the factory rubber baffles/gaskets/seals around the radiator in place? Any air that goes around the radiator instead of...
  13. Matt69olds

    Update on my Ignition Module failure!

    Nope, you’re not nuts!!! I do the same thing. Unfortunately, my supply has almost vanished, and they aren’t in salvage yards anymore. I’d rather have a good used 20 year old Delco module than the crap they are selling at the stores today.
  14. Matt69olds

    TH400 Yoke Bolt Came Out

    Then you should be good.
  15. Matt69olds

    TH400 Yoke Bolt Came Out

    You need a washer also. It needs to fit well to the register inside the yoke. Technically, all the bolt does is keep the yoke in place, and to prevent transmission fluid from seeping between the splines of the output shaft and yoke.
  16. Matt69olds

    Column wiring harness need help

    Here is a wiring diagram from a 87 G body, should be very close to what you need.
  17. Matt69olds

    TH400 Yoke Bolt Came Out

    I just tossed a handful of those bolts last week. Bummer. I would think as long as there is no other damage, replace the bolt, and either the complete housing or the bushing and seal and relax. Put some loctite on the bolt and properly torque it.
  18. Matt69olds

    Wiring Harness? Choosing one?

    Agreed! Even if you’re starting from scratch, you could buy a couple good used harnesses and build one far cheaper.
  19. Matt69olds

    Need help wiring power windows and door locks 83 K1500

    If your referring to the relay I suggested, just about any GM car or truck 1990ish and newer will have one. Sometimes they are in the door jamb area, behind the glove box, it shouldn’t be hard to find one.
  20. Matt69olds

    Truck cranks and starts and dies immediately

    Since you have HEI, the BEST way to wire it is to find the original resistance wire and remove it. Then you can install a regular wire in the original spot and eliminate the ignition bypass wiring and extra connections at the fuse box. You need a Series 56 male terminal, a couple bucks from...
  21. Matt69olds

    headlight/seat belt buzzer

    I don’t remember the RPO code, but the blue chime module is the holy grail. That’s the one that doesn’t just sound an alarm, it has a Speak N Spell type voice that tells you the key is in the ignition, the door is ajar, the lights are on, trunk open, etc. Those modules were found in Cadillacs...
  22. Matt69olds

    4l60 swap

    What PCM does the truck have to control the LS? Before doing anything, make sure the PCM won’t control a transmission. If do, definitely use a 4L60e. That will solve the TV cable issue, and allow you to dial in the shift points and converter lockup exactly where you want them
  23. Matt69olds

    Carb rebuilders?

    John Herald Jr Ray Kleem there are several others on the Q-Jet Facebook page. I know Ray and Cliff worked together, I think Ray took over the rebuilding when Cliff retired.
  24. Matt69olds

    Pumping Air to a Catalyst

    The temp switch automatically locks the converter if it gets too hot. The theory is a locked converter will reduced heat. Of course, by the time the transmission is hot enough to trip that switch, the damage is probably already done.
  25. Matt69olds

    headlight/seat belt buzzer

    I think the difference is for seat belt warning. There is a trigger wire for the seat belt switch in the seat belt latch, and another wire that is an output for the seat belt warning lamp in the dash.

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