1964 GMC 3/4 ton build :D

[sdwolff98]

Hi Darkrider actually the Dmax was for the burb but **** went down with my daily so had to sell it. The suburban came with a 283 in dammed good shape so just going to run that with a 2 barrel sniper eventually. I was terrified of wiring when I had the 6.0, then the 6.2 came along and a bit of luck happened there so I decided to give wiring a try lol.... Called around looking for a used 6.2 harness..... car-part.com is great for finding stuff BTW called 5 different places *chuckles* and bingo last yard I called said oh yeah we have a harness for that they are in boxes in our storage room............... turns out the delivery van with the GM harnesses rolled over and was totalled cargo and all. With a brand new harness I figured lets try this out. and here we are.. Now the 6.2 I had to sell I do not know if I mentioned in this thread. We had to move to Tacoma washington from DFW and mom in law needed help. the all told 2500$ 6.2 had to go to finance the move. sold for 6500$, the 3rd 6.0 was beat to hell that's when I started hunting the 8.1 lol

Sean

[Darkrider]

Ahhh ok, Now I am tracking the story a bit better lol. If my '84 didn't already have a 350 Olds in it I would have likely considered going big block. May still do so down the road with a 455 since the truck is already set up for Olds engines.

[sdwolff98]

Darkrider,
Oh I see I never posted all the engines I have had mounted in this truck or tried to lol. Lets see original engine was a 292 6, then a junkyard 350, a 454 vortec, and lq4 6.0, cummins 6 cylinder (never made it to mounting had the infamous 59 block cracked water jackets), 1992 camaro 350 tpi was next, escalade 6.2 (lucky find on craigslist with the 6l80e for 1k), then the 454 (6000k rebuild price in washington state :/), next another 6.0 as described, finally the 8.1 lol
Cheers
will be watching your build thread sir
Sean

[sdwolff98]

olds 350 can be a beast sir! have fun with it plenty of upgrades available for them they are popular

[Darkrider]

That is quite the list of engines that have gone through or nearly gone through this old truck. Hopefully, now that I have put the ex in the rearview I can get working on the '84 rather than just DDing it as I have been for the past couple of years.

[sdwolff98]

Darkrider,
My wife calls it squirrel syndrome!!!!

Sean

[Darkrider]

Originally Posted by sdwolff98

Darkrider,
My wife calls it squirrel syndrome!!!!

Sean

That is an apt description!

[sdwolff98]

well going back to an issue I found on the cruise to Dallas and back.. Cruise control was not working. So now that i have some times going to start tackling that problem on this truck. gmt400/gmt800 have an issue with LED lights and cruise control working. So that is one things to look at. Also ECM C1 pin 33 is another item to look at. Pin 33 needs 12 volts when the brake lever is not pressed. Will be testing that circuit tomorrow night now that I have the volt meter in a spot I can see it while pressing the brake lever . Also found a nice terminal that slides in the 8.1 ecm without damaging the terminal as well. Here are some pics. The tac module is getting the 12 volt brake light power so i may need to place a 6 ohm resistor somewhere in the harness. Thank heavens I built the entire harness modularly. So I can take out the tac/ throttle body wiring without removing the entire engine harness ROTFLMAOOO!!!! I used a 2 pin Delphi/aptiv sealed 2 pin connector for the ECM to tac communication wires I did a similar connector for the ECM to Transmission control module as well. Here are some pics of what I have setup for tomorrow night. the terminal is an MP100 delphi male terminal. I had some from back when I was buying up left overs from GM dealers in washington state lol

Sean

[sdwolff98]

a few updates, still having issues getting the cruise to work have added a resistor in and no luck just yet. Will be coming back to that one when I get some time to research the ECM programming as well. On another note was having stop light cooling issues. Temp was hitting 218-220 at stop lights. I did not have a fan shroud but now I do. I also remixed the coolant. 15% straight anti freeze, distilled water, and some water wetter and doing fantastic at stops. 205 the highest so far . I emailed PRC and they said yep gives us a couple of weeks and we will have a fan shroud for you. Top knotch company to deal with. Fit is great had to drill 3 bolts holes and add some weather stripping to the top of the chroud but it nice tight and no rattles at all. Trying to save some money at the mooment to get the ac unit charged up. everything electrical on it is working like it should. Lastly will be upgrading the alternator to a bit higher amperage then the 140 amp currently in the truck. Still researching companies on that on. Looking like Ohio or Mechman there.
Will post on that once I can afford either one and let yall know how well it works.

Cheers
Sean Wolff