Omec

iTrader: (2)

not sure what the function of the blocker rings are. could someone shed some light on the subject for me. im trying to figure out whats up w/ my trans and its horrible shifting. thanks!

85MikeTPI

iTrader: (9)

So called blocker rings, or synchros, block the shifter from engaging the gear, until the gear and shafts are synchronized to the same speed. They have clutch-like friction material linings that help to speed up or slow down the speeds, without wearing the metal components..

A very comprehensive tech article (among others) from Rockland Standard Gear is here: http://www.rsgear.com/articles/2005_07.pdf

DAVESS02

iTrader: (30)

The blocker ring has a tapered cone on the inside and teeth on the outside to engage the shift slider ring. When you pull/push the shifter in to the next gear, the slider engages part of the blocker first and pushes it up against the gear. This action wedges the cone of the blocker onto the matching cone of the gear essentially sticking the two together, causing the gear to speed up or slow down to match the speed of the slider ring. The torque applied on the blocker ring also causes those small teeth on the outside of the blocker ring to slightly mis-align with the teeth on the shift slider. This is the blocking action. As the gear and shift ring match speed, the torque reduces on the blocker and the teeth are able to align, and the shift sleeve slides over the blocker teeth and engage the teeth on the gear selected. Now the slide ring and hub assembly are locked onto the shifted gear assembly and that gear can be used. All of this happens is a very short time. In a properly working trans, you start in first and run that gear up, disengage the clutch, pull the shifter toward second. When the shifter passes the neutral position and is engaging second, there is a moment of slight resistance you fell as the shifter continues on into second gear. This moment of resistance is the blocking/speed matching action of the synchro and slider assem.