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  1. Hoodbj

    ECM question

    Just for gits and shiggles I replaced the prom in the burb ECM. Put in pickup and whalaah. Shifting and locking up in overdrive. I'm not sure what was going on before but for now working good. The only thing that seems a little off is it may be going into overdrive a bit early, around...
  2. Hoodbj

    ECM question

    Just for the hell of it I pulled the prom from the burb ECM. It reads jt8(g)/j6/p. lfivz348. Ab04. I am trying to research this to see if it went to another style tranny
  3. Hoodbj

    ECM question

    Thanks retro, will check into that this weekend
  4. Hoodbj

    ECM question

    The tranny shifted ok in the burb, the only bad thing was it built high rpms between 1st and 2nd before shifting. After that it was good. The 700 r from the pickup ran fine so that's why I used it. The burb did lockup fine though. I will see if I can get my hands on that ECM. My pops has a...
  5. Hoodbj

    ECM question

    I have a buddy with a 87 350 700r r10. I may try to coax him to let me try it. I am a little curious why the burb ECM would act this way. Are there different variations of 700r transmissions between 86 and 91, assuming both were factory
  6. Hoodbj

    ECM question

    Near Dallas Fort Worth area. I think you may be correct on the other tranny being a 700r also after checking the casting numbers. I wonder why no lockup on the 87 700r with the burb ECM? Thanks for the response
  7. Hoodbj

    ECM question

    I recently replaced my 87 tbi 305 to a 91 350 tbi from a suburban (with lots of help from this forum). The issue I'm having is I used the engine from the suburban but not the tranny which is not a 700r (4160e? Possibly) I used the 700r that was in the pickup since the tranny in the burb didn't...
  8. Hoodbj

    Wiring harness question

    Wow, I had completely forgot to change the computer out. Did that today but no real noticeable difference. What differences do they make for 305 vs 350? In leaving the correct one in just didn't notice any real change. I also forgot square bodies have the tendency to run out if gas before E...
  9. Hoodbj

    Wiring harness question

    It lives!!!! Started and sounds great, smooth idle and good pickup. Now off to the parts store for antifreeze and tranny fluid. Thanks everyone for the help. It's been a while since I've turned wrenches and forgot a lot.
  10. Hoodbj

    Wiring harness question

    Tps problem resolved. Just rewired connector. Getting down to the nitty gritty. I have to replace the low oil/fuel shutoff sensor also, only wish I'd have noticed it was slightly different before dropping engine because it does not look easy to get to.
  11. Hoodbj

    Wiring harness question

    You are correct Jin, after some research it is the tps, are these interchangeable or should I change the throttle body? Or could I splice the connecter in? Thanks again!
  12. Hoodbj

    Wiring harness question

    Not sure it's purpose. It is actually part of the throttle body on the front passenger side. The old tbi had a flat 3 prong connected and the new one has a more square connecter. Both connectors are 3 wire but the wires are different colors.
  13. Hoodbj

    Wiring harness question

    And sorry for the confusion, the connector that doesn't match up is actually on the tbi itself, I will look over the wiring diagrams and see if I can figure it out. Worse comes to worse I should be able to switch throttle bodies.
  14. Hoodbj

    Wiring harness question

    Thanks for the help. The big black wire with a red stripe is hooked up. The two prong plug is what's throwing me on how to desire. The 87 alternator only had the one brown wire in the harness but coming out of the same connector was an orange wire about 4 inches long with a ring terminal...
  15. Hoodbj

    Wiring harness question

    Ok ran into a couple of wiring issues. The alternator in the 350 has two wires that run into the harnes that are brown and pink with a black stripe. The 305 had one black wire Amin the harness and one orange with a eye to bolt to alternator. Also on the tbi on the front passenger side of the...
  16. Hoodbj

    Wiring harness question

    Transmission, starter driveshaft and crossmember in tonight after work. Installing a tranny solo is rough work. I had to see saw the transmission on 2x4s to be able to get it on jack and then balance it on the jack while trying to move it and jack it up to align at the same time, but it is...
  17. Hoodbj

    Wiring harness question

    Thanks, I will check out the oil sending unit tomorrow. As for the harness I agree, in sticking with what I have and just altering what I need. I have to pick up some shrink tubing and solder tomorrow. Thanks again fellows for the help! I really like the forum, very helpful.
  18. Hoodbj

    What have you done to your square lately??

    In the middle of swapping out a 305 for a 350 on my 87 . Also installed. 91 suburban front core support and grille. One of the cheaper cooler things (sometimes the simple things please me the most) is I put blue ledsttips inside my instrument cluster, really lights up now.
  19. Hoodbj

    Wiring harness question

    I noticed on the harness that where it plugs in on the firewall the light harness plugs into the bottom on the burb and the top on the pickup, not sure if it would make a difference but not much modifying needed to make the old harness it appears. I'm hoping to get back on it this weekend. I...
  20. Hoodbj

    Wiring harness question

    Ok, got the engine stabbed yesterday and everything went pretty smooth other than Hercules used a cheater to tighten all bolts in the suburban and then emursed them in acid to rust them really well. Going to start plugging in connectors and installing tranny tomorrow. Everything looks to plug...
  21. Hoodbj

    Wiring harness question

    Thanks everyone, I will keep everyone updated as I go. I just finished the core support swap onto the pickup. I plan on starting the engine tomorrow. I already have the 305 out of the pickup, I only have the 350 from the burb to pull. They are both tbi but the location of accessories, ac...
  22. Hoodbj

    Wiring harness question

    I recently purchased a 87 r10 with a 305. I also purchased a 91 suburban as a donor truck for parts. The 91 suburban has a 350 but has the serpentine belt system. I am in the process of putting the 350 from the 91 into the 87. Would it be best to remove the engine wiring harness from the...
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