75gmck25's latest activity
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75gmck25 replied to the thread Definitive interchangeable parts thread 73-87(91) (non-drivetrain).The logo on the early tailgates was centered, so the GMC embossed on my ‘75 is in the center of the sheetmetal. Later on they switched... -
75gmck25 replied to the thread Rim compatibility.If you just need a spare, and don’t plan to use it in a tire rotation, you can also use a 16” wheel and tire. 16” 8 lug rims are...
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75gmck25 replied to the thread Transmission cooler ideas.Long Mfg. Low Pressure Drop (LPD) coolers are stacked plate coolers (same design as B&M) and them come in many sizes. Most have a low...
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75gmck25 replied to the thread Crate SBC 350 installation plan.My old SBC had the factory lifting eyes already on it, so I used them in combination with a balancer bar. I took the distributor and...
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75gmck25 replied to the thread Power steering gear box.I think the boxes cross between 1/2, 3/4 and 1 ton without any issue if it's the same year group (IIRC, 73-78 shaft ends are different...
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75gmck25 replied to the thread Did the NP203 change internally between 1974 and 1977?.In the past they used to sell an NP203 chainsaver kit, but I haven't seen one advertised in a long time. I assume it just helped take...
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75gmck25 replied to the thread Small Block choices: A feller has too many.I think my choice would be #3, then maybe bore it out .030 and use pistons that would work well with 64cc Vortec or aluminum heads...
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75gmck25 replied to the thread Did the NP203 change internally between 1974 and 1977?.There were problems with the internal chain drive on early NP203's and they used a different width in later models. The info I found...
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75gmck25 replied to the thread General Motor Swap Questions.These are roller cam engines, so cam break-in is not needed, and idling them is less of a concern. Just get timing and carburetor set...
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75gmck25 replied to the thread Confusion on fuel and more..My truck has a ‘74 cluster becsuse I found one with a tach, so I assume my speedometer is the same as yours. When I first bought a new...
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75gmck25 replied to the thread putting in air conditioner.The big, long heavy compressor is the A6, and they often fail and contaminate the entire system with black granules. It’s usually best...
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75gmck25 replied to the thread AC Troubleshooting 1976 GMC C15.Did your truck originally have the large A6 compressor mounted on the driver's side? I had that on my '75 and they were infamous for...
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75gmck25 replied to the thread Regearing Advice... What do I need?.The 4.10 14 bolt was a common gearing in early 70’s 3/4 and 1 ton squarebodies. I would search for one and just do a swap for the...
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75gmck25 replied to the thread Crate SBC 350 installation plan.So this is a 2WD Blazer? Just checking, since on a 4WD you usually install the transfer case and transmission first, and then drop in...
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75gmck25 replied to the thread AC duct behind glove box.Based on the grommet around the line, it’s probably the vacuum supply line that goes through the firewall and connects to the vacuum...
