Since I put my 3:73's in there has been no problems. Even with 8psi boost. I've got a chip in that boosts line preasure and changes shift points to higher rpm range. The 4r70w is the transmission that is in all Modulars, also called the AODE. The 4r70w is in the auto trucks and I think even in the lightning. They are a pretty tough tranny for an auto. Cost of installation depends on the mech. Don't pay more than 350 bucks, 2 - 3 bills should do it. Make sure they have done alot of gear set ups or you can get screwed. The 3:73's make all the difference!! 
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98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!
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