924Board.org

Jason-87924S · Guest

Has anyone ever replaced the syncros in either a 924s or 944? Is it tough once you have the tranny out? Do you need special tools?

Thanks

jcope · Guest

I have no idea what's going wrong on your car, but refer to my previous post called "87 924S: Difficult Shifting". I put that up a few weeks ago. I would have sworn that my synchronizers were about to die. A little investment in some good gear oil helped immensely. There were a lot of votes for Redline. I used Valvoline synthetic. Redline apparently works better, so I'll probably switch next time.

Or maybe you're certain your problem can't be fixed with a lube change. In that case, never mind. I'm kind of interested in what it takes to fix synchronizers anyway.

Jason-87924S · Guest

Currently I am running Mobil1 75w90 gear oil in this car. It was put in by my Porsche mechanic. It made a very slight difference, but I like to shift quickly...I don't like to feel gear mesh.

This is why I want to replace the syncros.

Jason

dwak · Guest

Well I've got a boner-fide crapped out synchro/2nd gear in my '80 931. When I go to downshift no amount of double clutching helps. I have a spare trannie but if there is a cheap fix.....why not. I was told synchros are very expensive, hence the spare.

kevrl · Guest

Just had synchro's on 1st, 2nd, 3rd and 4th replaced by my mechanic, parts came to about £170 GBP, I can't see them costing any more on your side of the pond, it sure makes a differance to the overall driving pleasure though, now I can concentrate on the corners instead of shifting gear

Kevin
(Mine's a 931)

Jason-87924S · Guest

How much labor should I expect or is this a DIY job once the tranny is out?

Jason

wdb · Guest

170 pounds = about 240 US dollars, heres a money converter.
http://www.xe.net/ucc/
hey KEVRL, would you try and get a price for sychros, for 79n/a snailshell, I cant seem to find them herer

kevrl · Guest

Yes, this was the price for the snail shell transmission. UK spec cars still had this fitted to 1982 931's, so probably the cost would be the same for a '79 model ? I don't know where the mechanic got the synchro's from, but if you can't get them in the US for low cost then try the following UK people, they seem to be able to get most things that I ask of them.

http://www.berlyn-services.co.uk
http://www.porscheshop.co.uk
http://www.eurocarparts.com

You won't find an unusual part like this listed, but send them an e-mail and you may get lucky.

Kevin

kevrl · Guest

Ohh yeah and I forgot to mention .... if you continue driving with worn synchro's, you can wear out the 'dog teeth' on each gear, and these cost LOADS

Kevin

eturbo924 · Guest

DWAK
I had my 1982 924 5 speed rebuilt by my mechanic two years ago. It cost me $900 or so. I had syncros on 3rd and 4th go south. I drove the car for about a year double clutching, then decided it was time. There was no damage to the transmission other than the sheered sycros. He is not a transmission expert but he has performed this surgury on a 944 so I was confident. Car shifts great now.

Anyway just wanted to let you know the cost for mine. He suggested I find a good used unit and bolt it in.... but I wanted the original transmission so I paid the cost.

Eri

Diesel · Guest

Ants · Guest

Hey kevin, you said your parts cost about £170 how much did your mechanic charge for the labour? how long did it take him??

Ants

numbers · Guest

I have replaced the 1st and 2nd gear synchros twice in my '80 with the snailshell. I have also replaced the dogteeth on 2nd once. You can get the synchro rings from any dealer or Performance Products etc. They run US $50 to $75 per gear. I can dig up the part number if you need it. Don't know what they will run for the "S." If you need the dogteeth you will have to buy a whole gearset. The gearset for 2nd gear was about $1400. The hard part is removing the tranny. There is one bolt on the linkage that is damn near impossible to access, particularly if you have large hands. The tranny itself is not too hard to work on, only complicated. The Haynes is only fair in it's descriptions of the innards. The synchro itself has several small pieces that will pop out and the diagrams do not show you how to fit them back together. So be sure you look at them before you start to disasemble the shaft. Also, you will need an impact wrench to remove and reinstall the mainshaft nut. Besure that you mark the position of the nut on the shaft before you remove it, as you will not be able to get enough torque with a torque wrench to reasesemble it properly. However, with the impact wrench, you can just put it back to the original mark, and then lock it in place with a punch. Just a word to the wise, you will probably have better luck with the Audi box, but with the snailshell, my synchro's started to go again after only three or four thousand miles. It is quite a bit of work and expense to go to for no more mileage than you will get out of the new rings. Redline, with its friction enhansers does help some, and I would recommend it for you refill. However, since the prlblem with the Porsche synchro's is that they do not provide enough friction to get the gear spun-up quickly, I have often thought that I may try getting the friction surface of the synchro rings nurled before I install them again. I believe that this would provide more friction. Any thoughts on this?

wdb · Guest

numbers ,thanks for making it clearer for me. as for hard to reach bolts, well most of you know this, but some others may not so,attaching several extentions together ( up to several feet )and adding a universal joint ( swivel )or two and a wobble socket,you can reach around,over and under,and get at most hard to reach bolts. Ive even used one of those claws you use to get a dropped screw to guide the socket on to a tranny bolt, and dont tighten any screws until you have them all in .

Jason-87924S · Guest

Excuse my ignorance, but what is a snailshell?

Jason