mark boschert

I just had an experience with our 2 Spec Boxsters this weekend which might explain why so many SPB boxes fail. We noticed the stick felt difficult to move and did some checking. It turned out that the detent bolt on the side of the box had backed most of the way out on both cars. We retightened them and both cars now shift better. If it had fallen out completely, the gear selector rod fails to align correctly and causes gear damage or popout.
Detents are commonly found in the selector mechanism of a gearbox, holding the selector rods in the correct position to engage the desired gear.
A detent mechanism associated with a selector mechanism for change-speed gears in a manual transmission which includes a shift-and-select shaft axially slidably and rotatably assembled within a transmission housing and being linked with a manual shift lever to be axially moved in selecting operation of the shift lever .

Any thoughts?

jdistefa

This is a known issue. There are upgraded bolts available (which I used in multiple SPB transmissions). Can't recall the supplier. Someone here will know.

KevinGross

Did anyone ever figure out the supplier / part no. for the upgraded bolt?

txhokie4life

I got mine from Chris Amond.

In my case they didn't back out, they just snapped.

Not sure if that eventually lead to me loosing third gear.

Does remind me I have to pull them out of the old tranny and use them in the "new" one.

Mike

KevinGross

Mike, thanks.

BFT3.2

Can someone post a photo of the bolt and location on the box? Want to make sure Im checking the right thing.

tgsmith4845

There are 2 of these, one on each side of the trans. Replace the stock aluminum bolts with steel bolts.