Hi, are you saying sycros can be replaced without a complete rebuild? My second is shot, 3rd is weak and first (status unknown) I couldn’t care less about.
Did you imply this could be done with just the gear box removed?? DYI?? (I’m pretty seasoned…rebuilt around 12 motors in my life including a 928) Or $$$ guesstimate?
Aside from grinding 2nd without dbl clutching, and a bit of grinding in 3rd nothing howls, clutch works fine etc. Pretty low miles to boot.
What’s the minimum you think I could get away with?
Regards, PK
... It seems like usually by the time you experience a problem the damage is already done so I would bet you're in for more than just the synchros. There is likely damage to the synchro teeth on your gears and if you have to replace the loose gear wheels for first and second, Porsche requires replacement of the corresponding fixed gears if the milage is above something around 15k. So I would guess you're in for replacing first, second, the entire synchro assembly and if you wanted to comply with the Porsche's guidelines, the input shaft. ...
You can remove only the gearbox by itself, so the engine can stay in the car. ...pretty much impossible to do DYI due to all of the special press tools needed. I think if you want to save money on this you would be better off removing the gearbox yourself and then taking it to the dealer.
Hello,
Thanks for your reply, finding someone who’s got there hands dirty in a gear box is just the person I wanted to. I’ve done lots of motors, never a trans.
Isn’t the damage just the replaceable synchros most of the time?
I’ve Haven’t really been cramming the thing into gear. Doing my best double clutching I can usually get it into second with minimal or no gnashing, 3rd only grinds with a high rev. fast shift. (there’s no howls and the like) How likely Is it that I’ve damaged more than the synchros?
If you talk me out of DIYing it, I’d probably be taking it to an competent indi. shop I use. I’m a bit critical about dealerships in general and specifically Porsche, I think they overcharge and over prescribe, not to mention the fact that the a large percentage of a dealers profit comes from the service bays’
That would be nice, do you mean just the gear box or the whole transaxle assem?
I’ve access to a 20 ton press and a Lath and mill to fabricate tools, but if that’s a hug program in it self…I’d probably pass.
How do you feel about junkyard Trans? There’s several on Ebay (from a yard I trust) for $1500,supposedly with 37k miles, Their guaranteed for 3 months. If it’s good for 3 months, driven modestly and not often, any idea the likely the useful life expectancy?
Thanks, PK
You really never know the extent of the damage until you have a look for yourself. When you hear the grinding noise its not the synchro rings making the noise, its the guide sleeve of the synchro assembly and the synchro teeth on the gear wheel that are grinding each other. When these teeth get rounded off you have all sorts of problems. Say the synchro teeth on the second gear wheel were rounded, you could put a whole new synchro and rings in and you would still grind and likely jump out of gear too. I would say at this point its pretty likely there is more damage than just the synchro, but hey I lost my X ray glasses so you really need to tear the cover off and inspect it to know for sure.
I think you have your terminology a bit skewed, the gearbox is the transaxle. They are one and the same in rear/mid engined Porsches. Also dealer profits come from selling cars and selling parts. Actual profits from repair work performed is smaller than you think. Dealership service overhead is huge. Actually the entire "service" side of the business is looked upon as a necessary nuisance. The main reason dealers have service departments is because you cant sell cars without having a place to fix the inevitable broken ones.
A junkyard gearbox is definitely an option. Theres no real way to give any reasonable estimate on life expectancy on a junkyard box. You have no idea whats inside or whose been rowing the gears for the last 37k miles. As for myself the cost savings wouldn't be worth the lost peace of mind. On the last G86.20 I rebuilt there was a bit over 2 grand in parts (mostly because its needed a new input shaft). A brand new G86.20 with full Porsche parts warranty (2 years/unlimited mileage) was 4400. So yeah the junkyard box is an option but its rolling the dice for sure.