Quote:
Originally Posted by Erik Johnson
If you used a synthetic oil on your last change, get that out quickly. This may at least buy you some time on your rebuild. Once the synchronizer starts to die it will do exactly what you are describing, work well once it is hot but not so well cold. This is due to the fact that the metals swell with heat and the tolerances tighten up again to allow that synchro to get a good bite on the dog ring collar again. It will get worse though.
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I am gonna have to call BS on this theory.
The reason that a transmission would be easier to shift after it warms up is that the viscosity of the oil improves, gets runnier with heat. This lets the synchros hunt as they should, instead of spin around, stuck to the assembly
The metal parts do not shrink or expand in such a way that they bind and cause things to be harder to shift. Porsche tolerances are tight, but not THAT tight!
Yes, having badly worn synchronizer rings is not going to help either.