Thanks for the info on my future grinding efforts. I have a spare diff, but it is stamped on the outside with 3.64. I not sure if its correct so I plan on cracking it open and counting the teeth for a ratio. I beleive the stock ratio on my 83' now is 3.91, but i've never had it out to check. Korman sells the 4.11 for too much, I'm on a buget. Any ideas? Other diff options? I can't help you with the differences in manifolds, sorry. I can give you a couple of tips that will help you. First 4" is way to big. Try (throttle body size x 1.25) for a good place to start and choose something close to it (go bigger unless smaller is very close). If the intake tube change came with a change to a cone filter, try sealing the filter from the engine bay. A good place for high pressure, cool air is in front of the front wheels or straight below where the battery sits in an 2002 (corner of engine bay). Do this intelligently so that you don't have a filter sucking water when you go through a big puddle. Let your creativity roll here, you just have to seal the filter from places you don't wan't it to suck air and open it up to areas you do. The length of tube matters to the 'tuning' of the intake system (as does the volume and cross section area). So you could make up several and try them :) None of this stuff is gonna get you 20 hp but every little bit helps. As I mentioned before a g-tech to do before/after would let you see what happened better. Sometimes you do good and sometimes you take a loss.. On another note - don't polish anything in the intake manifold or intake ports. A rough surface is better. If you want to get into doing some touch-up work on the manifold you could take it off and look for any sharp edges in there. You DON'T want to get carried away with the grinder but smoothing these will not hurt. When you have the manifold off, you could also put an anti reversion step into the head. Basically, you want the opening of the intake ports in the head to be slightly larger than the exits of the intake manifold(1/16" at most and it does not have to be even on each side or on all sides). Air flows both directions in the port. But you want it to only flow one direction. This step helps fight flow in the wrong direction and does not hurt intake flow. You can also do this to the exhaust manifold, just opposite. You want the exhaust manifold openings to be slightly larger than the ports. With any grinding you do, remember not to go hog wild removing material and keep it clean. You don't want grit or aluminum grindings getting into the motor. BTW have you thought about going to a shorter diff ratio?
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