Rennshift install / 901 spring pressure, Are the springs pressing on bits in the tranny? Options

[smdubovsky]

I installed the Rennshift last night. Nice piece of kit to be sure. It spring loads the 4/5 plane just like the factory shifter spring loads the R/1 plane. My question is, what are the springs pushing against in the tranny?

The stock 915 (in a 911) uses a little tab on the 5/R side to keep the springs from pressing the shift linkage against stuff in the tranny. Here is a pic from Seine systems (he makes a 915 kit that also springs load 1/2 and adds the tabs to both sides).



You can see the little tabs and the hook on the shift lever that relieves the spring pressure when your anywhere other than the center plane (3/4 in a 915, 2/3 on our 901s). The reasoning is that you can spend alot of time in 5th gear in a 911 and its putting pressure on the linkage & couplings. The stock 914's stock shifter doesnt have it, but you'd never spend alot of time in 1/R either.

What is the spring loading in the 4/5 plane doing to the tranny? Are the 901 shift fork internals that much different from a 915 (doesn't look like it in the pics I've seen)?

Just looking to keep the tranny healthy,
SMD

[smdubovsky]

James,
But the G50 has an internal gate mechanism that relieves the pressure. (I understand its spring loading is internal too.) You can add the Wevo gateshift to do the same to a 915 but they dont offer one for the 901. I've never taken apart a honda/vw/etc tranny to know how they handle the problem. I've seen the 915 guts and I partially buy into the argument that the tranny wasnt designed to handle the constant pressure.

SMD