Recent content by krcaddis

  1. krcaddis

    Fire extinguisher vs. engine

    My timing was so far off that my 85 C20 backfired big enough to split my LH muffler from end to end, catching my filler neck and hose on fire. Fortunately we were able to get it out with a fire extinguisher - the dry powder kind. I had a fresh full tank. Once I got the repairs done I used the...
  2. krcaddis

    85 C20 AT suddenly backfires; now runs crappy

    My recently re-powered crate 350 (TH400) suddenly backfired cruising about 40 MPH and now sort of lugs, less power and sputters on decel. I suspect the timing. I changed harmonic balancers to match the rest of the pulleys, located the TDC (different place than marked), set timing based on that...
  3. krcaddis

    new crate motor, now no A/C and just one fan speed

    Thanks for the reply. Your diagnosis sounds very likely, but quickly went over my head. What's a binary switch look like and where is it? What is the "Control Unit" (- under dash, on dash, under hood?) I mostly suspect a cut or incorrectly connected wire (s) and/or vacuum line(s). The...
  4. krcaddis

    new crate motor, now no A/C and just one fan speed

    Sorry both same photo, (There isn't a dead end by fender/booster), but here's a better shot of greens plug w/dead end light green. Dark goes to A/C clutch (no power in any switch position) Sorry if prior description is confusing.
  5. krcaddis

    new crate motor, now no A/C and just one fan speed

    '85 C20 350/400, A/C- Thought I saw a similar post but didn't find it. I just plugged in a multi wire plug to a relay on my firewall and now I have a only low fan speed (in all run modes), but no A/C . At least it's some progress over nothing at all. A/C worked great before the swap after a...
  6. krcaddis

    WTB 700R4 to replace '85 C20 longbed TH350 2WD

    I'm looking for a good usable 700R4 '88-92 to replace my good running TH350 in my 85 C20 long bed 2WD. Easiest exchange is '88-92. 9" tailshaft and whatever else is generally required. I don't know all what else is needed I hope- cable, etc. I have a fresh Holley 4 BBL on it, so I want to keep...
  7. krcaddis

    Second Trans failure in 200 miles

    My '91 2500 4x4 was 2 years old when I bought it. After a year, or so, I lost 4th (700R4), soon 3rd, on a long trip. Had it rebuilt in AZ an AAMCO shop. I saw damaged parts, a ground down AL valve body (?). Had it rebuilt and added an external cooler. No explanation as to why. 6 months later...
  8. krcaddis

    Backfiring help

    Yesterday my '85 C-20 Scottsdale blew the muffler open along the seam on deceleration after a series of lesser pops. It's very first few miles on my 1st gen Mexican crate 350 transplant - driving to town to smog it. Then the plastic shield on the tank caught fire, then the cap. Fortunately a...
  9. krcaddis

    Electrical problem after crate motor install

    PS. BTW, tranny (th350?) appears to use vacuum for kick-down, not a cable. Is that possible? Or is it a different tranny? Trans code on glove box is MX1 : MERCHANDISED, TRANS, AUTO PROVISIONS It's a 3 speed, apparently no lock up (?), and won't kick down.
  10. krcaddis

    Electrical problem after crate motor install

    UPDATE: I checked all fuses=OK ground from rear of RH head connected to firewall.= OK found a broken small gauge (20?) loose orange wire at firewall,drivers side, where it appears it was routed through a large flatish plastic clip about 1"x 6" wide that locks closed and also holds holds other...
  11. krcaddis

    Electrical problem after crate motor install

    What does it look like? Can you post a photo?or a link to a drawing?
  12. krcaddis

    Electrical problem after crate motor install

    All is good after the crate motor installation in my '85, EXCEPT for two wiring snafus. 1) my fuel gauge (dual tanks) is pegged at 3:00. Somewhere under the hood there's an incorrect or missed connection. It's not even supposed to go further than about 1:00. 2) my heater fan and AC controls...
  13. krcaddis

    '91 2500 with 700R4 probs

    I did move on; sold the truck cheap to a friend who did trannies for the local Chevy dealership. It's just bad experiences now and I'm considering a 700R4 for my current '85 C-20. Looking at the fence not even on it yet...
  14. krcaddis

    Manually rotating SBC without plugs

    I posted a different thread aout my horrors with a 700R4 in my '91 4x4 and I'm wary of them in general. But I'm tired of 10 MPG in my '85 2X4. The crate I'm putting in a used crate 350 with about 20k miles. I overheated my original engine so I finally decided to replace the engine. I tried...
  15. krcaddis

    Manually rotating SBC without plugs

    I'm ready to find TDC on my crate 350 and install a timing marker. I pulled all the plugs squirted a bit of Marvel Mystery Oil in to lube the cylinders. (Heads are on it). I had to swap harmonic balancers to get the crank pulleys to align with the accessories (Alt. Smog Pump, Water Pump, PS...
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