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  1. Matt69olds

    Replacement parts for bed cover?

    I have a cover on the bed of my Ram. I bought this cover during the dark period of Covid. I got it thru summit racing, at the time that was all that was available. One of the hold down clamps is broken. I called Summit, they tell me the manufacturer has discontinued that model and no parts are...
  2. Matt69olds

    TCC issues on 4L60

    It’s easy enough to test the TCC solenoid once it’s out of the trans. Pull the solenoid, use a rubber tipped blowgun to apply air to the tip of the solenoid, air should exhaust thru the solenoid. Apply power (make sure you observe the polarity, some solenoids use a diode) the exhaust should...
  3. Matt69olds

    TCC issues on 4L60

    Pin F or the ALDL is converter clutch. If I remember correctly, if you put a test light on pin F the light should be on until the PCM provides the ground, then the light should go off. The ECM looks at lots of engine/drivetrain data to determine when the converter should lock. Things like...
  4. Matt69olds

    Stress cracking on transmission case, is it rebuildable?

    That’s normal casting marks. Nothing to worry about. Poor man’s crack detection: spray paint. Clean it up, make sure there is no oil on it, give it a coat of paint. If there is a crack the paint will seep in and make it visible enough for Stevie Wonder to see it.
  5. Matt69olds

    Electric Fan Conversion

    ^. What he said! It’s hard to beat factory engineering. We all like to think we work and abuse our trucks, but what the factory did during development was brutal. These trucks didn’t overheat when new, assuming it’s maintained they shouldn’t now. The best fans are either the high dollar...
  6. Matt69olds

    TH350 speedometer drive 2WD

    Read this: https://www.tciauto.com/speedometer-gear-calculator You can use this to figure out what gears you need.
  7. Matt69olds

    LS swap transmission problems

    PO740 is a converter slippage code. Meaning the pcm is commanding the TCC to apply, but it either isn’t or it’s slipping Can you feel the converter engage? Get it up to highway speed, stay steady on the throttle and touch the brake pedal. Not enough to actually slow the truck, just enough to...
  8. Matt69olds

    TH350 speedometer drive 2WD

    It’s a ratio adapter used to fine tune the speedo. Certain tire size/gear ratio combinations require speedo gears that don’t exist. The ratio adapter can fine tune the speedo. If you clean all the crud off the adapter you will find the ratio. Some overdrive the speedo (if it reads slow) or...
  9. Matt69olds

    Ticking/slapping noise

    Take the oil filter off, cut it open with tin snips. If something is wearing or banging around you will find the debris in the filter long before you find it in the oil.
  10. Matt69olds

    Smokes way to much?

    Pull the plugs, disable the ignition, wire the throttle wide open, and do a compression test. Rule of thumb is there shouldn’t be more than 20% difference between the highest and lowest cylinder. Be sure to crank the engine the same number of pumps on each cylinder. The first pump of air...
  11. Matt69olds

    1986 C10- Is it reliable enough for a daily driver?

    This thread is several years old, I’m betting the truck has been sold. I personally would rather have an unmolested truck if I was looking for a daily driver. GM made millions of these trucks, good solid unmodified trucks are out there. The problem with custom trucks is you don’t know the...
  12. Matt69olds

    Seized engine?

    Pull the oil filter, use some tin snips to cut it open. If it’s full of metal, there is no point in doing any diagnostic work with the engine in the truck.
  13. Matt69olds

    Does anyone use Gear Venders unit with TH350?

    ^what he said! Small block, mild big block, go 700. Lots of power, lots of serious abuse, bit the bullet and go 4L80. I have a gear vendor in my Olds, it’s been in ther probably 15 years. If I had to do it over today, I’d go 4L80 without hesitation. The ability to program shift points and...
  14. Matt69olds

    How to add cruise to truck built without?

    I used the Rostra universal cruise kit on my 81 GMC. I used a speedo head from a truck with factory cruise, you also need the speed buffer ( greed box with a small ribbon cable) that plugs into the speed sensor. You also need the matching plug for the factory cruise lever. Depending on what...
  15. Matt69olds

    Does anyone use Gear Venders unit with TH350?

    Unless you really plan to beat on the truck, or add a bunch of power, go with a 700. Properly built, I wouldn’t hesitate using one behind a mild big block. If you do plan to add a bunch of power, go with a 4L80. It will take far more abuse that a 700 ever will, and even with the added cost of...
  16. Matt69olds

    Different brake codes?

    Sounds like a pretty easy question to answer!! Power brakes or manual? Now why couldn’t the counter help tell me that???
  17. Matt69olds

    Different brake codes?

    Same bolt, I used the new washers that came with the hose.
  18. Matt69olds

    Different brake codes?

    Had to replace a brake hose on the 81 GMC. The truck makes a HARD left turn whenever you hit the brakes, and once you release the brakes it takes a couple seconds before the truck would start to roll. Obviously, the hose has collapsed internally. Once I got it back together no matter what, I...
  19. Matt69olds

    Th350 or th400? Help please

    Read this: https://www.crankshaftcoalition.com/wiki/TH350_rebuild_tech
  20. Matt69olds

    Th350 or th400? Help please

    Unless it’s a really stout big block, a 350 will hold up just fine with a few cheap upgrades. Plan on a full set of bushings. Machine the direct drum piston the equivalent of one steel plate and friction, that allows you to install 5 friction plates where 4 were factory. Dual feed the direct...
  21. Matt69olds

    TH350 help

    With the pan off, the full mark on the dipstick should be about the same level as the oil pan rail. It takes the application of 2 different clutch packs (the direct clutch and the low/reverse clutch to get reverse gear. It takes more fluid to apply 2 clutches, that’s why reverse is usually the...
  22. Matt69olds

    Strange square holes in case...

    This^ Use a small punch thru the hole to push the snap ring out of the groove, then use a small screwdriver or pick to pull it out.
  23. Matt69olds

    700r4 problems

    Fluid over full after sitting a few days is normal. The converter will naturally drain into the pan.
  24. Matt69olds

    CUCV Torque Slip (TH400)

    Most factory converters will have a stall speed of around 1600-2200. I know the place I buy remanufactured converters won’t sell a TH350/400 converter without a core. There is no core charge, either you have a core or they won’t sell one. Who would have thought the day would come when stock 12...
  25. Matt69olds

    Strange square holes in case...

    And another case for sale on EBay. Do you have a service manual? Once you get the pump and forward/direct drums back together it’s easy to air check your work. Stack the direct drum with bearing onto the forward clutch housing. Set the pump with the bearing or thrust washer in place onto the...

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