Printable Version of Topic
Click here to view this topic in its original format
914World.com _ 914World Garage _ Rennshift reverse lock out stopped working
Posted by: john77 Jun 14 2021, 11:52 AM
Car was off the road for 5 months as I was flaring it and doing some other work.
I'd been having issues getting into first before that so decided to redial in the shift pattern, but now, for some reason, even though I have all 5 gears and reverse, when I'm shifting from first to second, unless I go really slowly, it tries to get into reverse (i.e. blood curdling grinding noises).
I used to AX the car and had full confidence slamming it from first straight into second, but now I'm not sure what's happened.
The spring loaded lock out pin on the Rennshift springs into position so I can't push the shifter to the left and forward, but that doesn't seem to matter - shifting straight forward and a little bit to the left seems to be putting me into reverse.
My first thought was I'd moved the pattern way too far to the right, but if I try to dial it back to the left a little I lose first and reverse.
I have the tangerine precision shift adjuster, firewall bushing, shift linkage, all new bushings etc, and there's no slop in any of it, so I'm a little stumped as to what's changed.
Here's a picture of my shifter in first with the lock out pin doing its thing.
Also, and I can't remember if this is normal, to go into fifth I just push the shifter as far as it will go right and then pull back. But fourth isn't the same.
If I push the shifter all the way to the right and push it forward, it won't go forward. Instead, I have to move the shifter slowly to the left while maintaining forward pressure until it "finds" the slot for fourth and only then moves forward. Is that how it's supposed to be?
Posted by: mepstein Jun 14 2021, 12:07 PM
I would call JWest. They are very helpful and knowledgeable about their products.
Posted by: john77 Jun 14 2021, 12:12 PM
Thanks, I've just sent them an email. Unfortunately, they don't list a phone number on their website.
I would call JWest. They are very helpful and knowledgeable about their products.
Posted by: ChrisFoley Jun 15 2021, 11:26 AM
Have you fiddled with the short shift ratio on the Rennshift?
Posted by: Steve Jun 15 2021, 11:42 AM
Have you fiddled with the short shift ratio on the Rennshift?
Good point, if you change the default setting to the shorter throw it bypasses the lockout or causes it to not work correctly. You also need to make sure the stick is in the middle for the 2nd and 3rd plane. It should be spring loaded to the first and reverse plane and the 4th and 5th plane.
Posted by: john77 Jun 15 2021, 01:05 PM
Hey @http://www.914world.com/bbs2/index.php?showuser=209 .
It's been about 5 years since I fitted it, and I haven't touched anything on the shifter since then. I'm 99% sure I never adjusted anything on it though - I just bolted it in straight out the box in it's default setting.
Have you fiddled with the short shift ratio on the Rennshift?
Posted by: ChrisFoley Jun 15 2021, 02:03 PM
Have you looked inside the plastic cover at the trans? Everything tight there?
Posted by: Mark Henry Jun 15 2021, 04:30 PM
Have you looked inside the plastic cover at the trans? Everything tight there?
I've had the set screws back out on me at both the trans and the firewall joints, make sure they are tight.
Posted by: john77 Jun 15 2021, 06:18 PM
@Mark_Henry, wow, you totally nailed it.
The set screw at the firewall between the stock shift rod and the tangerine linkage had backed out and the hole in the rod was no longer in line with where the set screw seats into it.
I pulled the whole linkage out and then fitted it back in with the rod disconnected from the shifter, and then reattached the precision shift adjuster and the damn thing is shifting better than it ever has haha. It’s so tight, I honestly don’t remember it ever shifting so good. I didn’t even have to adjust the pattern, it was just there.
Have you looked inside the plastic cover at the trans? Everything tight there?
I've had the set screws back out on me at both the trans and the firewall joints, make sure they are tight.Posted by: Mark Henry Jun 15 2021, 07:34 PM
Cool glad you got it. 
Posted by: Mark Henry Jun 16 2021, 07:17 AM
BTW a new set screw has a little plastic nub in an indent that is suppose to lock it in, once you remove the screw the nub is gone. Really it's one use only.
I had limited success with a dab of hot glue in the indent.
Now I clean the screw and the thread 100% and use a drop of red Loctite, but to remove you have to hit it with heat for a few seconds.
Posted by: ChrisFoley Jun 16 2021, 10:07 AM
Posted by: jim_hoyland Jun 16 2021, 10:21 AM
BTW: There are several great Rennshifter videos available on YouTube.
One address’ the reverse lockout issue.
I’m still trying to get the “slop” out of mine.
Posted by: john77 Jun 16 2021, 10:24 AM
Ha, that's funny, I literally red loctited it back in... and then wondered if I should have asked you first whether red loctite was a good idea.
BTW a new set screw has a little plastic nub in an indent that is suppose to lock it in, once you remove the screw the nub is gone. Really it's one use only.
I had limited success with a dab of hot glue in the indent.
Now I clean the screw and the thread 100% and use a drop of red Loctite, but to remove you have to hit it with heat for a few seconds.
Posted by: john77 Jun 16 2021, 10:29 AM
Thanks Jim. Even though this is now sorted (fingers crossed) I'll take a look at those. The slop caused by the backed out set screw definitely appears to be the cause of my problem based on a short test drive though - I'm going to drive up Angeles Crest Friday morning and put it through its paces just to be sure though haha
BTW: There are several great Rennshifter videos available on YouTubr. One address’ the reverse lockout issue.
I’m still trying to get mine …
Posted by: Steve Jun 16 2021, 10:32 AM
Thanks Jim. Even though this is now sorted (fingers crossed) I'll take a look at those. The slop caused by the backed out set screw definitely appears to be the cause of my problem based on a short test drive though - I'm going to drive up Angeles Crest Friday morning and put it through its paces just to be sure though haha
BTW: There are several great Rennshifter videos available on YouTubr. One address’ the reverse lockout issue.
I’m still trying to get mine …
For the last 40 years I have used Blue Locktite and never had a problem using the same set screw over again. I typically replace it after the allen screw starts to get stripped.
Posted by: john77 Jun 16 2021, 10:38 AM
@http://www.914world.com/bbs2/index.php?showuser=209
Thanks for chiming in on this. I cannot say enough good things about your shift linkage kit and precision adjuster. Now I've tightened the backed out set screw the shift is so tight and precise.
Powered by Invision Power Board (http://www.invisionboard.com)
© Invision Power Services (http://www.invisionpower.com)