Stiff Gear Box

[Guest]

During normal driving the gears are selected easily but when driven hard the gear selection becomes very stiff especially 2, 4 & 6

Any ideas?

 

[Steve Humphreys]

Hi I had a similar problem though the symptoms weren't exactly the same. My car had a problem whereby I really had to pull hard to get 2, 4, and 6, this was virtually all the time. 1, 3 and 5 were pretty well as normal. The problem here seemed to be a diff bearing which had separted and effectively jammed to shift linkage--probably a far more simplistic explanation that is meaningful. For me this required the diff bearings to be replaced.

However, the starting point should be to check that there are no problems with the linkage--I can't see that a change in temperature would affect the shift linkage but it is a reasonably straightforward inspection that can be done with the car up on a ramp.

After this the only way I can think is to pull the gearbox and see if it is a similar problem to what I had.

For me on the positive side I took the opportunity to replace all the synchro's--there was nothing wrong with them and the car had only done 43k miles but I thought that they might need doing at some point so while the gearbox wa in pieces was as good a time as ever. So effectively I have a new diff/gearbox as a result.

Hope this is helpful and not too much scare mongering.

Steve

 

[Stuart Hatfield]

had same problem drain the g,box oil and see what comes out if its needle rollers diffneeds looking at its not a hard job but a little costly

 

[mike cooper]

Hi. Had similar problem on my 1994 Carrera 2 993 just after I bought the car two years ago with genuine 32000 miles on the clock. Had difficulty changing gear. You had to pull quite hard on the lever. Was speaking to one of my customers who happened to also work for Maclaren F1 team. His Ferrari 355 had similar problems which were revealed as rust on the main shaft which meant the splines were grabbing on the clutch. Had Steve Bull (Porsche specialist) drop the gearbox and there was the obvious area of rust on the shaft. Cleaned off and reassembled the problem was immediately sorted. Took the trouble to put new clutch in at the same time due to the expense of remove the box. The original clutch was still in very good condition with little wear. Rust put down to lack of use prior to my ownership. No signs of any other problems at all with the transmission. Car has covered 8000 miles since with no sign of the problem.

 

[Sundeep]

had a similiar problem about a year ago... the gearbox oil revealed fragments of metal which turned out that that diff was chewing it self up..... so needed to be rebuilt, which did cost a few £'s []

works a treat now with my shortshifter.. if only someone made an even shorter shortshifter, as that 20% reduction still feels too long !

 

[Sundeep]

just remembered you could also try spraying WD40 in the gear box levers / mechanism that are accessible from within the cabin..... taking the leather covers et al isn't that hard, but if it solves the problem then you may have saved a a few £££'s !

btw.. what kind of mileage does your 993 have ?

 

[Steve Humphreys]

Graeme

Have you been able to solve the problem with the stiffness in 2, 4 and 6--intersted to hear what it might have been


steve