Precision shifter issue

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.

fredjohnston · 10-11-2019, 05:19 PM

Not enough pressure...crank it up, not down.

SSDiv6 · 10-11-2019, 05:23 PM

Like Fred said, crank up the pressure.

ss3011 · 10-11-2019, 05:38 PM

Make sure the shifter cable is adjusted properly . I adjust mine on the 1st gear detent . This will make sure the detent in the transmission matches the detent in the shifter .

Ed McLawhorn Jr. · 10-12-2019, 06:29 PM

Thanks guys. Doubled checked linkage and increased pressure to 120psi and it works in the yard on a low rpm chip.

Jeff Niceswanger · 10-12-2019, 09:51 PM

Quote:

Originally Posted by Ed McLawhorn Jr.

Thanks guys. Doubled checked linkage and increased pressure to 120psi and it works in the yard on a low rpm chip.

I don't know what kind of controller you have, but first make sure the duration of the shift isn't overwhelming. The pressure has to shove, then relax so the pin can fall and let the shifter get ready for the next shift. Sounds like its bound up to me, not letting it relax.

Adger Smith · 10-14-2019, 03:20 PM

I do the cable adjust in second...

Jeff Stout · 10-14-2019, 03:45 PM

Quote:

Originally Posted by Adger Smith

I do the cable adjust in second...

I agree. I fought this for awhile. Adjust in second. Put air up to 120. Prior when it was at 80 psi one night it was really, really cold and the pressure went down and would not shift. Now zero trouble and with only 500 psi in bottle and still going.

Cotten · 10-15-2019, 11:26 AM

My controller requires setting it to "pulse". If you do not it makes the 1-2 shift but not the 2-3 pretty much what you described.

Ed McLawhorn Jr. · 10-15-2019, 11:32 AM

I adjusted in low gear, but will go back and adjust in 2nd. I failed to mention, but it's a front exit cable and has to make 2-90's bends to attach to trans. There is a small amount of slack in cable. Was told it was due to bends. Anyone else encountered this and if so, how to best minimize the slack. It's roughly 1/8" -3/16".

10-11-2019, 02:50 PM	#1
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 287 Likes: 3 Liked 16 Times in 14 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.

10-11-2019, 05:19 PM	#2
fredjohnston Member Join Date: Jul 2007 Posts: 341 Likes: 0 Liked 55 Times in 14 Posts	Re: Precision shifter issue Not enough pressure...crank it up, not down.

10-11-2019, 05:23 PM	#3
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 2,990 Likes: 690 Liked 1,454 Times in 542 Posts	Re: Precision shifter issue Like Fred said, crank up the pressure.

10-11-2019, 05:38 PM	#4
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 885 Likes: 63 Liked 221 Times in 102 Posts	Re: Precision shifter issue Make sure the shifter cable is adjusted properly . I adjust mine on the 1st gear detent . This will make sure the detent in the transmission matches the detent in the shifter .

10-12-2019, 06:29 PM	#5
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 287 Likes: 3 Liked 16 Times in 14 Posts	Re: Precision shifter issue Thanks guys. Doubled checked linkage and increased pressure to 120psi and it works in the yard on a low rpm chip.

10-14-2019, 03:20 PM	#7
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,348 Likes: 433 Liked 676 Times in 260 Posts	Re: Precision shifter issue I do the cable adjust in second... __________________ Adger Smith (Former SS)

10-15-2019, 11:26 AM	#9
Cotten Member Join Date: Aug 2007 Posts: 219 Likes: 452 Liked 485 Times in 58 Posts	Re: Precision shifter issue My controller requires setting it to "pulse". If you do not it makes the 1-2 shift but not the 2-3 pretty much what you described.

10-15-2019, 11:32 AM	#10
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 287 Likes: 3 Liked 16 Times in 14 Posts	Re: Precision shifter issue I adjusted in low gear, but will go back and adjust in 2nd. I failed to mention, but it's a front exit cable and has to make 2-90's bends to attach to trans. There is a small amount of slack in cable. Was told it was due to bends. Anyone else encountered this and if so, how to best minimize the slack. It's roughly 1/8" -3/16".