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  1. 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.
  2. 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...
  3. 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...
  4. 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.
  5. 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...
  6. 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...
  7. 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...
  8. 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???
  9. Matt69olds

    Different brake codes?

    Same bolt, I used the new washers that came with the hose.
  10. 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...
  11. Matt69olds

    Th350 or th400? Help please

    Read this: https://www.crankshaftcoalition.com/wiki/TH350_rebuild_tech
  12. 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...
  13. 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...
  14. 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.
  15. Matt69olds

    700r4 problems

    Fluid over full after sitting a few days is normal. The converter will naturally drain into the pan.
  16. 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...
  17. 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...
  18. Matt69olds

    Strange square holes in case...

    Here is a brand new case cast by ATI for drag racing. You can see the hole in the same place.
  19. Matt69olds

    Strange square holes in case...

    Crap, I forgot to take the picture. If that’s the only concern, then go head with the overhaul. Lots of cases have holes cast into them that look just like what you are seeing. Aluminum is expensive, they don’t put any more into the case than is absolutely needed.
  20. Matt69olds

    Strange square holes in case...

    That’s just a drain hole. They are cast that way. I have a th350 torn apart on my bench, I’ll take a pic when I get home from work.
  21. Matt69olds

    Haynes manual suggest silicone dielectric grease for ignition module?

    I’m pretty sure it’s mentioned in the factory manual to use thermal paste. I’m sure the book says to use GM part number whatever, but whatever it’s called it’s a heat transfer paste.
  22. Matt69olds

    CUCV Torque Slip (TH400)

    I forgot about the diesel governor!! When I swapped the 455 Olds in place of the blown up 350 Olds diesel on the first test drive I noticed immediately it shifted way too early. I think the shift points were around 3500-3800, it definitely made for a sluggish WOT. I swapped in a “mystery” gov...
  23. Matt69olds

    CUCV Torque Slip (TH400)

    They will physically interchange, it’s the internal pump/turbine/stator combination that is the problem. The torque curve between a gas and diesel engine is completely different, a really tight diesel converter won’t be fun behind a gas engine.
  24. Matt69olds

    CUCV Torque Slip (TH400)

    Get a remanufactured converter for your truck with the gas engine. The stall speed will be all wrong for the engine, especially if the engine has some go fast parts. The diesel engines have a low rpm torque curve, the factory converter is tailored to that. The gas engine will definitely not...
  25. Matt69olds

    Haynes manual suggest silicone dielectric grease for ignition module?

    Thermal paste is NOT dielectric grease! Dielectric grease is designed to seal connections from moisture, and to allow easy disassembly. Thermal paste is designed to help transfer heat. In my 35 years of driving, I have had 2 modules fail. One would quit once the engine got hot, the other...
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