Miles Posted May 2, 2015 Share Posted May 2, 2015 (edited) 240Z with SBC 350 and WC T5 transmission After six years of flawless use my 89 WC T5 transmission is grinding when shifting between 3rd and 4th gears. While out for a drive the grinding got progressively worse. No grinding in any of the the other gears, just 3rd to 4th. I can double clutch it into 4th with little or no grinding When I pulled into the driveway the shifter (stock T5) jammed in 1st gear. I shut the engine down and shifted to neutral and restarted the engine. Shifted hard into 1st gear, but was able to put car in the garage. A Google search indicates that the 3rd and 4th gear synchronizing assembly is probably warn or broken. Another Google search suggested that the pilot bushing could be causing the problem. Here is what my T5 manual says: Clutch damaged or out of adjustmentPilot bearing between input shaft andOutput shaft bindingDamaged synchronizerBell housing misalignedDamaged gear or gearsWorn or damaged flywheel pilot bushing Any other suggestions? Edited May 2, 2015 by Miles Quote Link to comment Share on other sites More sharing options...
whatnow123 Posted May 3, 2015 Share Posted May 3, 2015 Sounds like you are pulling the trans. It's going to be all speculation what is going on until you check it out. Fortunately T5's are cheap and easy to rebuild. Quote Link to comment Share on other sites More sharing options...
Miles Posted May 9, 2015 Author Share Posted May 9, 2015 (edited) Solved: The T5 4th gear synchonizer assembly hub keys broke and fell out. The transmission shop I bought the rebuilt T5 from six years ago replaced the synchonizer hub and keys at no charge. Edited May 9, 2015 by Miles Quote Link to comment Share on other sites More sharing options...
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