12200411 PCM swap for 1996 to 2000 GMT400 trucks

ricosauvec1500 said:

thank you guys, but is he the only way to get the pinouts? I’ve tried looking up the pinouts online but I haven’t had much luck

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L31MaxExpress said:

Same in the Express van and I am not just talking about an extorsion fee handed to me by someone in a uniform that broke more laws than I did while driving wrecklessly to catch up. When the 350 was in the van, it went 45* to the road at 40-45 mph after breaking the tires loose on dry pavement on the 1-2 shift. That was with the Lunati 218/228 cam twisting it 6,000-6,200 rpm. My brother and I were talking about grabbing dinner before heading back to the shop, me on autopilot took the exit for the shop. My brother said hey, what about food. I told him sorry brain is on autopilot. I stopped at the 3 way, then burried the go pedal to get up the short, steep little on ramp there and it proceeded to skate around on the 1-2 shift, putting us 45* to the road. I let off, steered out of it and got it back under control. My brother looks over and said in a hurry much. I said, yea food is calling, I got back into it and merged on the highway. I am fairly certain it had the 5.13s in the 9.5 at the time. I have had the 383 break tires loose when the converter locks in 2nd gear at 60-65 mph a couple of times as well, felt like transmission slip the first time, but I caught it on a datalog and the MPH went up sbout 6-8 MPH, then dropped back down 2 or 3. Forget using any throttle on a rainy day.

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supspt454 said:

What gear and tire you running in the van

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supspt454 said:

What gear and tire you running in the van

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L31MaxExpress said:

This is with the 383, 4L85E, 3.73 gear and 30.5" tall LT245/75R16s on it. Remember too it is almost a 7K lbs van with me sitting in the driver seat. It could stand a bit more gear or a 6L90E swap. I have a line on a 4.10 G80 factory rear disc rear end out of a newer van that is a bolt on. So it may very well end up with the $200 rear end in it. That is if my buddy ends up acquiring the van it is in from his work place for the rest of the drivetrain. For longevity I am only spinning the 383 to 5,500 rpm although it makes a pretty flat HP curve all the way to 6,200. I am sure it would shave a little off the 0-60 reving in higher, but really no point. It moves plenty well for me to jump on the highway and get up to ~80+ mph traffic is moving before the end of the ramp without stressing hard on the valvetrain and rotating assembly constantly. I brake torqued it to maybe 1,500 rpm then got on it in this clip. The converter will brake stall 2,900 rpm but it just hazes the tires through most of 1st gear leaving much over 1,500 rpm.

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