We were running a completely stock T-5 in my friend's 88 until 3rd let go last Nov. it held up just fine after a full season of drag racing every sat. night for 3 months launching at 4500 on slicks with a 150 NX kit, but we also used a stock clutch and it finally let go one day while I was driving it home on the interstate, started slowing down and I went to 3rd and boom, no more 3rd. We have the D&D Motorsports 3rd and 2nd gear kit in it now and have also added P heads and a Novi2000, we'll see how it holds after we put the King Cobra clutch in and run it on slicks. As for the 4cyl T-5 in mine, I just put another used one it after destroying the first one which was behind my new engine for about a month and the current one has been in it for 2 weeks and 1st through 3rd sound like they are ready to go any day now