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Ed McLawhorn Jr. · 10-11-2019, 02:50 PM

Have precision 3-speed co2 assisted shifter that will not shift from 2nd to high gear. For some reason it won't release plunger/stop so it will shift to high gear. It does fine during burnout when I start burnout in 2nd. It also works fine when I hit the test button on co2 line. Test button allows you to check wiring, plumbing on shifter without having to go live. It acts like the co2 pressure is keeping shifter up against the stop. I can pull shifter back maybe 1/8" and it will release and allow me to go to high gear. Can't manually go to high gear if 1-2 shift was co2 assisted. Can go manually from 1-2 and 2-3 without co2. I lowered line pressure from 95 to 80psi with same result. Side note, ss'er was last run at Atlanta and shifter worked fine even though we broke trans. I was testing last night prior to going to Rockingham next weekend.

10-11-2019, 02:50 PM	#1
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 306 Likes: 3 Liked 19 Times in 17 Posts	Precision shifter issue Have precision 3-speed co2 assisted shifter that will not shift from 2nd to high gear. For some reason it won't release plunger/stop so it will shift to high gear. It does fine during burnout when I start burnout in 2nd. It also works fine when I hit the test button on co2 line. Test button allows you to check wiring, plumbing on shifter without having to go live. It acts like the co2 pressure is keeping shifter up against the stop. I can pull shifter back maybe 1/8" and it will release and allow me to go to high gear. Can't manually go to high gear if 1-2 shift was co2 assisted. Can go manually from 1-2 and 2-3 without co2. I lowered line pressure from 95 to 80psi with same result. Side note, ss'er was last run at Atlanta and shifter worked fine even though we broke trans. I was testing last night prior to going to Rockingham next weekend.