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  1. Matt69olds

    Opinions please on possible use for zinc oil additive

    I would think any engine made in the last 15 years would be fine on low zinc oil. I would especially think a generator engine would be perfectly content on just about any quality oil of the proper weight. Those aren’t high rpm engines, they basically run at the same speed. I bet the valve...
  2. Matt69olds

    700R4 Speedo Issue

    The terminator controller is what everyone recommends, it’s the next step up. The Dominator setup is the top of the line, with the top of the line price tag.
  3. Matt69olds

    1985 4x4 700r4

    How many miles since the rebuild? If the 1,2, and 3 shifts are normal, with no other issues, put the shifter in 3rd gear, drive the truck at a speed well beyond where it would make the 3-4 shift, and put the shifter in 4th. If it shifts, upshifting/downshift a few more times. If the valve is a...
  4. Matt69olds

    How to test torque converter lockup solenoid

    Technically, you need a non lockup valve installed in the pump to maintain the correct amount of fluid to the cooler. If you study the hydraulic circuit, the lockup valve restricts the amount of oil that goes to the oil cooler. Since probably 85% of the heat generated in a transmission comes...
  5. Matt69olds

    Holley issues

    Have you verified the float level is correct? With the sight plug removed, you want the fuel level just below the hole. If the float level is too high, it can flood the engine. Look down the throttle bore while it’s running, look for fuel dripping from the accelerator pump nozzle. If it’s...
  6. Matt69olds

    Somebody help a newbie!

    Start with the basics. Inspect or replace the plugs, carefully inspect the plug wires. If they are in bad shape, replace them. Same with the distributor cap and rotor. Once you’re certain the ignition system is in good shape, make sure the timing is right. There should be a sticker under the...
  7. Matt69olds

    700R4 that only mildly backs up at 1200 rpm

    Bummer. We will never know what the real problem was. At least it’s fixed.
  8. Matt69olds

    Holley issues

    It’s probably time to just pull off the carb, take it apart, see what’s been changed and screwed up, and start from scratch. You have already said the accelerator pump is frozen and inop, it’s never going to run right like that. Find out what jets and power valve are supposed to be in it from...
  9. Matt69olds

    -speedometer

    https://www.tciauto.com/speedometer-gear-calculator You need to know tire diameter, gear ratio, and either the drive or driven gear tooth count. This chart will calculate the other gear needed. Sometimes the chart says “no gear available” that means there is no gear that can be used with the...
  10. Matt69olds

    Fuse question (what is this for? Empty on a schematic)

    Found this pic online, you can see the pink pigtail that the power windows would plug into. The circuit breaker bridges the gap. If your truck doesn’t have power windows, they will be a blank spot where the jumper snaps in
  11. Matt69olds

    Fuse question (what is this for? Empty on a schematic)

    The blank spot is the power feed for power windows. It has a plug that snaps into the empty cavity, the power window feed connects to that. There is a 30 amp circuit breaker that bridges the empty spot. If something is plugged into the left cavity (where the circuit breaker would go) whatever is...
  12. Matt69olds

    This is probably a bad idea, but I'm too cheap to pay for a tow.

    The 425 ran really well, but the 2.41 peg leg rearend hurt big time. That car was a money maker at the Friday night test and tune/grudge races. I could run the entire 1/8 mile in first gear. And with the lousy gear and tall tires, tire spin wasn’t an issue. As long as you cut a decent light, the...
  13. Matt69olds

    Rear Gear Install for C10 with TH350

    If you have no plans to swap transmissions, go 3:42. If a 700 trans is in the budget, go 4:10. A 2004R properly built will handle far more power than a 700, regardless of the reputation they have. While a 700 is stronger in stock form, the 2004R has far more potential, assuming your pockets...
  14. Matt69olds

    This is probably a bad idea, but I'm too cheap to pay for a tow.

    Funny towing story. My first year of college (1991) my roommates girlfriend decided to pay a surprise visit. She was driving a 78 Grsnd Prix with the might 301 engine. She called out apartment (this was a Wednesday about 4:30 in the afternoon) made some small talk, and oh by the way, her car...
  15. Matt69olds

    This is probably a bad idea, but I'm too cheap to pay for a tow.

    Tow strap is the only way to go. I’ll emphasize COMPETENT assistant. I tell anyone who flat ties the guy in the front NEVER touched the brakes unless absolutely necessary, the guy behind does all the braking. That way you never get slack in the strap. And if the person in front does have to...
  16. Matt69olds

    This is probably a bad idea, but I'm too cheap to pay for a tow.

    If it’s only 20 miles, get a tow strap, a competent buddy, and flat tow it. Since the suburban runs, no need to pull the driveshaft. You could leave the engine running, meaning you have power steering, power breaks, and heat/defrost. Tow it either late at night or early in the morning (whenever...
  17. Matt69olds

    Oil Pan Gasket Change Out... what else?

    Environmental Loctite!! Always make’s seemingly easy projects much more difficult.
  18. Matt69olds

    Radiator recore or buy new?

    The plastic/aluminum radiator were kinda problematic when the first came out. Like most new technology, there are some learning curves. It didn’t take long for the OEM to figure out how to make them last. My neighbor suburban has probably 225k on it, they are pretty reliable. Which kinda...
  19. Matt69olds

    Oil Pan Gasket Change Out... what else?

    Other than taking a little weight off the mounts, there isn’t much of a trick. They usually slide right out. What problems are you having?
  20. Matt69olds

    Gearing for performance TH700R4 + 3.73 ?

    I’m betting with 4:10 gears and a 700 with the converter locked, you will be almost identical cruise rpm as with the non lockup 350 and the current gearing. Keep in mind, he non lockup 350 has about 250-300rpm of slippage at highway speed. I bet a decent 305 with 4:10 and a 700 will run pretty...
  21. Matt69olds

    Oil Pan Gasket Change Out... what else?

    Wow, this could get ugly with the MAW (Might As Well!). If you’re going thru the trouble of replacing the oil pan gasket, I’d replace the timing chain if they’re is any significant wear. The biggest hassle with timing chain replacement is getting the timing cover around the oil pan. No oil...
  22. Matt69olds

    Radiator recore or buy new?

    Radiator repair shops have gone the way of full service gas stations. When I started driving 35 years ago, there were 5 radiator shops in my town. None remain today. I don’t know if there are any in other town around me. All things being equal, aluminum is better. While copper has better heat...
  23. Matt69olds

    Automatic noob

    You are checking the fluid level with the engine running, with the shifter in park? Drop the transmission pan. If the trans is cooked, that’s where you will find the debris. Use 2 o-rings on the trans filter pickup tube. If your current tube has only one, use the old o ring off the original...
  24. Matt69olds

    700r4 code

    That’s probably a calibration code. At one time there was probably a sticker somewhere on the bellhousing with those same numbers. The calibration code tells the people on the assembly line what color accumulator springs to use, which valve body and spacer plate to install, what extension...
  25. Matt69olds

    How to test torque converter lockup solenoid

    If the pan is off, it’s easy to see what wires do what. I don’t know if you could hear the solenoid click with the pan on. You might be able to feel it by touching it while applying power. It’s easy to test it hydraulically. Remove the 2 10mm bolts that holds it to the case. Put a blow gun on...

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