there is more to it than the flywheel. there is a difference in bellhousing depth that must be taken into account. am in process of a 4.8l swap into my 90 c1500 with getrag 290 5spd. i used an ls1 flywheel for a camaro ss with my stock truck clutch and flywheel. had to find a longer clutch release bearing. napa part number n1086sa. found this info researchin on ls1tech and its working for me so far