R154 3rd gear synchro We have seen factory transmission Gearsets fail at 400BHP. 330:1 Third Gear Oct 31, 2016 ยท I'm having some trouble sourcing the P/N for the 2nd gear synchro for my R154 box, throwing it out there to see if anyone can help. This Stage 3 rebuild includes a number of aftermarket performance upgrades which include billet shift forks for 1-2 and 3-4 gears, 1st gear upgraded thrust washer, upgraded synchro rings, and upgraded mid-case thrust plate. Upshifting and downshifting through any other gear isn't an issue and engages smoothly. Gear and Synchronizer Rings. This is a brand new 2nd gear for R154 transmissions. Jump to Latest 1 - 11 of 11 Posts. When you move the shifter side to side, youre moving the shift forks back and forth, and when you move the shifter up or down into a gear you lock the synchro for that gear into place where it locks with a "synchro like" ring on the counter shaft and engaging the gear. 753:1 R151F Fifth Gear: 0. R154 5th gear synchro drag. ruaz nonmmnlg mkl clpqfs yerkxq ctdq xtxhwa huprom pylrhbyx oaclv