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  1. M

    1st TBI Conversion Help Needed

    This saga just won't end. Yesterday my son and I swapped out the transfer case which is detailed in another thread. We go to take it for a spin to see if it fixed our 4x4 problem and the truck has never run so poorly. It spit, sputtered, and eventually died to a no start. I'll go back and...
  2. M

    Another NP203 Question

    ...plenty
  3. M

    Another NP203 Question

    I sold my GN a few years ago and have already taken a fair share of crap for it on this site. There's plenty of them around, I might get back into one some day.
  4. M

    Another NP203 Question

    There's no coupler on ours. Only a female input shaft. The thrust bearing I'm referring to is in this picture. This article references a 75 Blazer NP203 so I wonder if there are some design changes in the 78. Ours definitely doesn't look like this. When we get to dropping the original...
  5. M

    Another NP203 Question

    For me it depends on the application. We have a 69 F100 that was my grandpa's last truck bought new. It would have come with a 360 but will get the long rod 400. Technically not a BB but lots of torque for not a lot of money. The 84 short box will get a punched 454 or 427 TD. The 84 will...
  6. M

    Another NP203 Question

    I have a full seal kit left over from the TH350 rebuild. The guy told me at the time he couldn't buy the TC/Trans adaptor seal alone and had to buy the whole kit. That will come in handy now as the rear output shaft oil seal is hard as a rock. He was able to grab the shifter and linkage. Not...
  7. M

    Another NP203 Question

    There's definitely a BB in the future of his 84 short box. Gotta get this kids plow truck more dependable so he can generate cashflow.
  8. M

    Another NP203 Question

    I guess the main thing is that there isn't another major with the same spline count. Ford drops on drivers side and has 28 or 31 spline...GM drops on passenger side and is 27 or 32....from what I read.
  9. M

    Another NP203 Question

    I believe that is correct but there is no such thing as a 4wd glide, is there?
  10. M

    Another NP203 Question

    Need a quick answer here guys. About to send my son on a Friday afternoon class skipping salvage yard trip. We are going to pick up an unconverted 203 to swap into our faulty converted unit. They have several laying around, but don't know which ones are converted or non-converted. They will...
  11. M

    1st TBI Conversion Help Needed

    Yeah, could be. That or Dave tuned it accordingly.
  12. M

    1st TBI Conversion Help Needed

    Yes, ran just fine before the conversion. Pretty gutless before and after conversion.
  13. M

    1st TBI Conversion Help Needed

    Carb swapped to TBI. Old gen 1 SBC. The engine has been overhauled at a minimum. I had to replace a head gasket last winter and the cylinder bores looked like new.
  14. M

    1st TBI Conversion Help Needed

    Sorry that may have been an old log file. I did replace with a 195 degree thermostat and my coolant temps were 180 degrees. Didn't change any symptoms though. Engine is I think a stock 350. heads are stock and there was no obvious porting or work done to it when I had them off for head...
  15. M

    1st TBI Conversion Help Needed

    I hear you on the gearhead site. I just zipped a log file to this post.
  16. M

    Correct Hood Ornament for '76 GMC

    My 78 K15 does not have one.
  17. M

    1st TBI Conversion Help Needed

    I have a couple log files already created capturing the symptoms. I tried awhile back for @1987 GMC Jimmy and this site will not let me upload an .xdl file. If you would be so kind you could PM me your email address and I'll send you a log file. @4 @4WDKC Thanks! PS - I've not had much luck...
  18. M

    Another NP203 Question

    I found a salvage yard within a 2 hour drive that has several NP203's laying around. I can go through them and find one that has not been converted. Is there anything to look for other than obvious gear and chain wear that is viewable to the naked eye? If the oil looks ok and there isn't a...
  19. M

    1st TBI Conversion Help Needed

    I've checked for vacuum leaks on all the TB connections, TB base gasket, the vacuum boost brake line, and nothing. Where else could a vacuum leak be coming from? And why do I have good vacuum at idle and then poor idle at operating RPM?
  20. M

    Identifying my transmission

    Correct I was only referencing @Honky Kong jr comment on them being in Monte's etc. IIRC the TH2004R had a different valve body and some other things than the regular TH200.
  21. M

    Identifying my transmission

    That's a TH200-4R I believe. My GN had the 200-4R. That was actually a pretty good tranny.
  22. M

    Another NP203 Question

    Appreciate the real talk. There is one thing I know is going on in my 203, and that it pops out of 4wd all the time. Credit the crappy part time kit. Nothing I can do about that at this point it was with the truck when I bought it. With all I've learned now and the use of the truck, I'd...
  23. M

    Another NP203 Question

    I know I said I wasn't interested in a NP205 swap, but let's at least explore the option. I understand I need different length driveshafts due the "shorter" NP205. Is that front and rear driveshafts? What is the exact length if I am rummaging? Is there any other issues to consider in the...
  24. M

    1st TBI Conversion Help Needed

    I went over everything testing for vacuum leaks and all is good. the only way I can get it to change idle is shoot directly into the throttle bore. However, I did notice that the injector harness (inside the TB) and the throttle bore is covered in soot...which is coming from when the engine...
  25. M

    1st TBI Conversion Help Needed

    I double checked the thermostat and it was a 160 degree unit so I replaced with a 195 degree thermostat and my coolant temps are much better. The only thing I notice is that when idling, if I stab the throttle a bit I get the cutout around 1200 RPMS. I can slowly increase the throttle at idle...

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