Quote:
Originally Posted by Lugnutz65
I have read all the above and agree with the following:
Here's what I think you should do in the following order.
1. You need to run a dedicated full 12 volts to the HEI dizzy. Use a 10G wire or bigger.
2. Now, set the timing to 10 degrees with all vac lines plugged. You can go up to 14 degrees later, but see what kind of power you make at 10 degrees first. You can fine tune the timing using a vacuum gauge.
3. Your 235/70/15 tire is a 28" diameter tire and should be fine if the above issues are addressed first. A smaller tire will treat the symptoms but it's not the cause of your power issues. Also a smaller tire might look too small on a truck. It's a matter of personal taste, but I wouldn't go smaller for that reason.
4. Swap the rear to a 3.73. remember that changing the rear affects EVERY gear. A lower rear end (i.e. 3.42 or 3.73) will increase the power you have in EVERY gear. It will also reduce your MPG.
5. Add an OD transmission if you want to keep the 3.73 and want better MPG. An OD tranny will not affect performance in the first several gears but it WILL reduce your RPMs in OD and thus give better MPG with highway driving. A nice AT for a 3.73 rear diff is the 700R4.
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Notes taken. I will try to give this a shot tonight or tomorrow. Tires are new so there isn't any change going to happen there. I have some wire at home so I will rewire the HEI and set the timing. Items 4 & 5 are on my wish list.
I really want to keep the six. A trans and gear change are cheaper than a 350 goodwrench swap (once you add in intake, carb, dizzy, headers, misc brackets, mounts, exhaust system.