is there a spring that will work good for a replacement spring i can get at a auto parts store?

What exactly do you mean? As far as I know, RTs don't have any special spring. It runs on gas not used by the marker during cycling. I could be wrong and it could be different for a 98, but the only springs you should ever need to replace or modify are your hammer spring and the trigger spring (unrelated to the RT). And that spring can be replaced by a clicky-pen spring.

Minus the trigger spring, you cant buy random springs to replace your current ones. Here is a list of all the types of 98s and their parts... Tippmann Parts

If your looking to upgrade or replace your hammer springs, I HIGHLY recommend this kit. A5/98/BT hammer spring upgrade kit

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I completely concur with the Colonel on this...I have used the BT spring kit myself after upgrading my hammer.

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Thanks its the trigger spring

Our local ace hardware has a pretty extensive spring selection, but you're still taking a shot in the dark really. Not sure if ace is a nation-wide chain, but if it is you might check it out. Probably something you can cut down to size there for the sake of getting your gun working. Why not just call tippman though? Its a much safer bet.

find a papermate flexgrip pen that is retractable, the springs in most papermate flexgrip clicky pens are a perfect match, and lighten your trigger pull considerably.

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^That's the one. With my A5 I had luck with a BIC clicky pen.

I actually thought I could do this a few years ago, but in reality there is just to many variables when buying random springs. At the least you have to consider spring tension (compression or stretch tension), spring thickness, and compression/stretch distance. Just these 3 variables are enough to make your head spin when trying to match a random off the shelf spring. But I wont tell you not to try it, I still occasionally look for springs for special projects.

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Lots of guys do the clicky pen mod. It does help with trigger control quite a bit

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I'm CDO, that's the same as OCD except it's alphabetical like it should be.