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Used Porsche and Prestige Cars For Sale | Harbour Cars

Short Shift Kit - 4th gear...

R

rabbitstew

Imola
Joined
21 Aug 2015
Messages
779
Fitted a SSK to my 997 turbo a couple of days back. Nice easy job. I marked both cables so I could refit them the same. Everything went well and im impressed with the new reduced travel in the lever.

However, I notice that if I change from 3rd to 4th quickly I get a crunch. Its only if im changing quickly. Around town or normal relaxed driving gear changes are all smooth and fine. Theres no play in the lever when you wiggle it etc.

Before I dismantle half the car again and try adjusting the cables & endless road testing. Does anyone else with a SSK experience the same. I wonder maybe if its just the syncromesh on the box as you can really whip it from 3rd to 4th quickly now with the SSK.
 
It's your gearbox mate. The problem has probably always been there but the increase in speed of the change has highlighted it. With a ssk, all you're doing (apart from less hand movement) is accelerating the selector arm on the gearbox. The distance that arm moves is still the same. By accelerating the selector, you highlighting the sluggishness of 4th gear synchromesh.
 
alex yates said:
It's your gearbox mate. The problem has probably always been there but the increase in speed of the change has highlighted it. With a ssk, all you're doing (apart from less hand movement) is accelerating the selector arm on the gearbox. The distance that arm moves is still the same. By accelerating the selector, you highlighting the sluggishness of 4th gear synchromesh.
Click to expand...

Cheers, thats what I suspected (or was hoping) tbh. Just wanted to double check id not done anything wrong!
 
The SSK on my turbo made third to fourth a pleasure, so probably a gearbox problem.

First and second gears are a little stiff, but that is because they are fitted with triple synchromesh cones. Third has double synchronisation and fourth, fifth and sixth single synchronisation. Therefore fourth should be one of the easier gears to get in theory!

For completeness, reverse has single synchronisation.
 
basildon993 said:
The SSK on my turbo made third to fourth a pleasure, so probably a gearbox problem.

First and second gears are a little stiff, but that is because they are fitted with triple synchromesh cones. Third has double synchronisation and fourth, fifth and sixth single synchronisation. Therefore fourth should be one of the easier gears to get in theory!

For completeness, reverse has single synchronisation.
Click to expand...

Hmmm.. interesting. I did read a lot about how the SSK makes 1st/2nd a bit stiff, but mines fine. I did wonder if the cables needed some adjusting, but I would have assumed that if the cables were not right then it wouldnt engage 4th correctly at any time, not just make the crunch on quick shifts?
 
If it was a cable problem then you would be having problems in second and sixth as well I think?

My next job is a transmission oil change to see if that helps improve the shifting.
 
I'd be inclined to ring Mike at Sports & Classic and seek his advice.
He is a gearbox guru and may offer experienced insight into the issue.

Third gear synchro could be knackered and brought to light by the SSK.
The usual synchro issue is mainly with second.

I'm not sure about adjustment issues or the more inflammable argument of OPC kit versus after-market kit and doubtless for every one guy who has the former there will be another that had the latter and vouches no issues with either kit.

If its gearbox worn synchro, I'm not sure what effect changing the oil will have. But its a cheap starting point against a full gearbox strip/rebuild st around £4k! So worth a go with the cheap solution first.

If it does need a strip/rebuild consider carefully who you entrust with the work.
It needs specialist tools and experience. I know Mike has both and regularly see a couple of gearboxes a month at his place for strip/rebuild.
 
Well as an update, I have done 300 miles since fitting and all seems perfectly fine now, so I have just put it down to an oddity or me doing over zealous ninja gear changes when first fitting.

No problems at all with finding 1st or 2nd when car is stone cold, and it slots nicely in when changing gears. It makes the gear change on the wifes car feel like wiggling a stick in a bucket.
 
You're now £4k better off if the situation has corrected itself without gearbox strip and rebuild.
 
cheshire911 said:
You're now £4k better off if the situation has corrected itself without gearbox strip and rebuild.
Click to expand...

Indeed, now I have "saved £4k" I can go out & buy a new exhaust system! :D
 
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