No...the T5 won't care what size flywheel you have as long as the clutch disc and the pressure plate are the same size and the spline count matches the input shaft. I did have to make a new connecting link for my clutch. A couple of other folks have told me they had the same issue. The short throwout bearing didn't provide enough length to let the linkage adjust right and the long bearing wouldn't fit. I just used some 5/16" steel rod and all was Jake after that.
I could check the GM Heritage page site. I think the Astro Van came with a 10 inch clutch and 11 for the extra passenger package. Edit...just looked and GM says 9.125" for standard Astro Van.
I didn't measure & calculate the extra contact area but the area of a 10 inch circle is 78.5 and the area of an 11 inch circle is 95 just for comparison.
Last edited by baldeagle; 05/17/202411:18 PM.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
