Mike Frye

One thing to note about the round hole versus oblong hole in the rear shift coupler:

The original hole is designed that way. You could say it adds slop, but you could also say it allows for some play so that you're not applying every movement of the shifter directly to the transmission input shaft. Some people (I think including Jim Bailey, whose opinion I would seriously take into account) believe that this 'play' in the linkage is required to lengthen the life of your transmission.

I think of it as being just like the difference between solid motor mounts and stock MMs: It will definitely remove any movement, which is bad in some circumstances, but for your average driver in typical conditions, it may not be warranted and may cause more wear and tear elsewhere.

If your current bushings are shot, then stock replacements are going to give a HUGE improvement by removing almost all of the play. The round hole delrin replacements will give incrementally less movement but at what cost?

I don't know if there's any hard data to back up the claim that a round hole could cause more wear and tear on your transmission, I just wanted to point out the other side of the argument so you know when you make your choice.

Dave928S

I've given that thought too. The oval hole could 'allow' the gear selection train to 'find' the detents which they settle into in each gear, and not be held back by any pressure on the shifter, which might inhibit the gear settling 'in' to position.

Considering that, I at first hesitated to use anything which took out that play, but then thought of my DD which has a gearstick direct into the box with no such inbuilt intentional play, and couldn't see that the oval hole could deliver any real positive benefit. I also thought that the four bushed connection points in the linkage chain, no matter how tight, still give some play anyway.

The bottom line is that I personally prefer a tight notchy gear selector, with good feel ... and my driving style is to guide the shifter towards the target with an open hand and let it 'find' its way into gear at the right revs ... instead of wringing the neck of the gearstick and pushing it where it may not easily go.

Jim ... Mike brings up a good point. My personal preference is for delrin ... but you should decide what you prefer and make your own judgement on whether you want to mess with what Porsche put in originally.

jwillman

Thanks all.

I see some pretty old posts talking about the delrin so I assume we have some history within the community around their performance.

Anyone been using them for a while that would care to share their thoughts?