Moparts Tech ArchiveManual & ClutchesClutch ?'s 4Speed question on clutch?mopower440 ok, my friend bought a 1966 coronet with original 361BB and 4speed a few years back, this was back before we knew anything about mopars, so he gets it and the clutch goes out on it, a neighbor man looks under the hood and says its a 440, so we go to the parts house and get a clutch for it and we told the partsman it had a 440 4speed, he gives us the clutch and we go home, well, it turns out the clutch wouldnt fit, i cant remember if it was the spline count or what, but it wouldnt work, in the mean time, i ran the numbers on the block and it did have a 361BB, not a 440, so, now we want to get the car going again, my question is, how many different style clutches did mopar use behind there big block cars? i heard there are only 2 different ones, is this correct?? Brian_wo for the most part you need to know if you have a 10½ or 11 inch flywheel and if it's an 18 or 23 spline tranny. mopower440 will the clutch measure either 10 1/2 or 11" exactly with a ruler or is there another way you have to determine wether its a 10 1/2 or 11? The outside center holetohole  15.50" on a 10.50" Your car probably has a 10.50" bell housing and a 23 spline trans input shaft. Most early 440's used the 11.00" and an 18 spline trans. which is probably why yours won't fit. *Get me the casting number off your bell housing and I'll tell you what it is. I'll second Scott. It should be a 10.5" w/23 spline disc. Is it apart? If it is measure the old disc and count the splines if that's what it comes down to. info provided by members listed above
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