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Gregg

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Where is the best place to look for a 3:9:1 differential to lower the gearing on my 86 XT GL (EA82 NA)? Also, what about pistons and/or cams to up my compression ratio?

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remember that you will have to swap the entire transmission with the rear end to match gears. but also, a non turbo trans should already be a 3.9 gear. you can only have a different rear gear if you run your 4wd as a RWD, removing a front axle.

 

a non turbo mpfi should have 9.5 compression, the highest with stock pistons, you already have as high as they come stock, or swapping in other stocl parts.

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I would tend to guess that the XT has a 3.7 in it, especially if its an automatic.

 

I think the 3.7 is more suited to street use personally but to each his own.

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I just picked up a 2" catco cat, and once I pick up a new Y pipe, I will have my local shop finish my exhaust system (I already have a 2" muffler). After that, I was looking at a higher compression - maybe 10:1? I'm not big on turbocharging cars that weren't designed for it. I had also looked at flywheels and pully kits.

 

I don't neccessarily want a dragstrip car - I'd rather have more GT performance.

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You realize, of course, that many of these cars came with turbo. True, the compression ratios are different, but this could be a complete bolt-on affair.

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