1987 GMC V1500 Sierra Classic LS swap/build

[y5mgisi]

I believe people have done it before.

[NastyBuzzard]

Originally Posted by y5mgisi

I believe people have done it before.

I haven't seen anyone do the 99+ style.. I've seen a few guys attempt the 97 style dash but never really any fully finished stuff with good pics.

I'm more so interested if anyone's ever swapped the under dash ac boxfromthr nbs (withservos) into square body n replaced the vacuum setup. A lot to consider here and a lot of neat things could done. However, I don't mind the 87 dash, kinda gotten used to it but I want to make this swap as clean and neat as possible.

[NastyBuzzard]

I got most of the dash out last night. I gotta zip tie the instrument cluster back in so It can still be moved/driven around a bit. I need to bypass heater hose so I can remove the rest of the the hvac. Still contemplating if the hvac setup from the 01 would fit in the 87.



Today I am leaving work on time so I can get home and get trans fluid flushed and a new filter/gasket & fluid put in to see how it goes. Also got a bottle of lucas stuff for the trans. I am hoping it will act better than it did before.

If it does do decent then soon I will start detaching stuff from engine to clean, prep and paint it.

Any recommendations to do to engine before I do the swap? Any gasket changes or checks I should do? I do plan to pop valve covers and take pics of what heads look like.

[NastyBuzzard]

So I changed trans fluid and flushed as much of the old out as I could. I even added some lucas.

Results where pretty good. Seems to shift a lot better (on jack stands). Was great at first then shifting linkage/cable came loose. I realized this by when I moved shifter on column it didn't do anything. I found out I knocked the c-clip out. I put it back in and the cable where I think it is supposed to be and took it down the road. Seemed a lot better but when I stopped it was sluggish off the line and I realized it wasn't shifting all the way back down to first. When I manually dropped it back down into first it was fine. Still holding first a little longer than I'd like sometimes though, but otherwise good.

Any way to adjust the cable? Like a normal tv cable on 700r4? Any ideas why it isn't dropping all the way back down into first?

[NastyBuzzard]

Actually after some reading. It may be starting out in 3rd gear. Rpms were crazy low and wouldnt pull itself up a small embankment. If I drop it all the way down in 1st manually it does downshift but may only be going to 2nd. So I may be in limp mode... Need to investigate some stuff.

[y5mgisi]

I feel like probably a sensor isnt plugged in or a ground is un done. Otherwise, maybe the trans is no good. And no, there is no cable adjustment on these.

[NastyBuzzard]

We must have posted about the exact same time. I am getting a check engine light but no way to check it currently.

Like I said after reading I think I am in limp mode, b/c if I unplug battery and reset it acts differently at first. I am not 100% sure. Before I changed fluid it was just holding trans in 1st gear till around 25mph sometimes and sometimes 30mph.

When I first filled it with fluid and ran it through gears on jack stands it seemed fine but has developed into this. Not sure what I may have messed up.

[NastyBuzzard]

Found this, no clue what it goes to.




I ran engine codes, deleted them several times and these three kept popping up.

P0133 - 02 sensor

P0332 - knock sensor on Bank #2 is generating a low output voltage

P0785 - 3-2 Shift Solenoid Circuit Electrical

Where to start..