Spdrcr Posted December 16, 2020 Share Posted December 16, 2020 Hello. I tested the fit of the JCI driveshaft in my 280z with LS1 and 4l60e. The driveshaft slides all the way in the transmission and then pulls out a bit once you get the flange lined up. It seems to pull farther out than I would suspect. About an inch and 1/2. Does this look correct? Quote Link to comment Share on other sites More sharing options...
alainburon Posted December 16, 2020 Share Posted December 16, 2020 I just went through the same issue, my JCI driveshaft was too short. 1 1/2" is too much. I bottomed out my slip yoke and pulled it out 3/4" then had the driveshaft made to fit. I verified this with Modern Driveline and Tick Performance. Quote Link to comment Share on other sites More sharing options...
Spdrcr Posted December 17, 2020 Author Share Posted December 17, 2020 bummer was really hoping for a yes that is normal answer! Here are some more measurements. The transmission shaft sticks out about a 1/4 to 1/2”. The yoke is about 3 3/4” and the splines go all the way to the edge I can’t math real gud but that leaves about 2 1/2” of spline contact. My gap is 1 1/2” If the normal gap is 3/4” would it be worth redoing the shaft to add 3/4” more contact? Quote Link to comment Share on other sites More sharing options...
alainburon Posted December 17, 2020 Share Posted December 17, 2020 I hear you, in my case I had no choice. Mine was leaking from the rear seal. I replaced the seal twice and still leaked. I was also told that not having proper engagement could damage the transmission bearings in time. You can always try it like I did, if you have no leaks or vibrations you may be ok. Quote Link to comment Share on other sites More sharing options...
Richard Oben Posted December 22, 2020 Share Posted December 22, 2020 With a fixed pumpkin that is not enough engagement, there is a bearing or bushing in there that the yoke rides on. We never trust pre made shafts, measure and give a good shop dimensions. HTH, Richard. Quote Link to comment Share on other sites More sharing options...
billyjones454 Posted December 31, 2020 Share Posted December 31, 2020 I just tried in my JCI driveline and I have about 1/4" to 1/2" of exposed yoke Quote Link to comment Share on other sites More sharing options...
Spdrcr Posted January 2, 2021 Author Share Posted January 2, 2021 I reached out to JCI and the service is great. I sent it back to get fixed. Very happy about that. Quote Link to comment Share on other sites More sharing options...
Spdrcr Posted January 12, 2021 Author Share Posted January 12, 2021 New shaft came back and fits perfect. 3/4 inch gap. Any smaller and squeezing the thing in there would be harder. Quote Link to comment Share on other sites More sharing options...
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