Porsche Enthusiasts Club Forum

My box is louder than when I got it. Still ok but I've seen a few non runners on ebay at 150 to 160 K miles with dead diffs. It's clear that sooner or later it's going to have to be replaced or rebuilt. (Have a plan to add some horses which may finish it off!) Sounds mostly pinion but i wonder if once the diff is done then I might hear how bad the rest of it is! I don't want to fit a second hand one as its unlikly to last the car out. This is a daily drive doing approx 10K miles/ year. When ever I've fitted second hand bits they were never as the dismantler described them & I ended up paying twice. Sure they would list mine as good if they got there hands on it!
How big a job is it? All bearings & seals are available & would be around £400 with gaskets.
Porsche shop do a rebuild service. Anyone tried them? Diff only for £600 ish. Should I do the main input output shaft as well.
Been quoted 4K ish for the full box Syncro seems fine on all gears.

Hi

Do not even think about it as an amateur...you wont have the tools or the gauges ...basically its not on....think of it like being asked to rebuild the space shuttle from a pile of parts...BLINDFOLD ....lol

Changing a diff is relatively easy though, as long as you do BOTH crown wheel AND pinion together for a matched set...

p.s 4k for a box rebuild is ridiculous.....try a local gearbox specialist...as a guess ...a full rebuid WITH guarantee....around 1k to 2k max...

All the best Brett

Thanks Brett. Sounds like an exchange recon then. Wasn't planing on a complete rebuild. Just to replace some bearings. Will see if I can get a better price away from the Porsche speicalists!

Hello
my 91 turbo gearbox was very noisy so I have rebuilt it.(all the bearings were worn out).The job is quite straightforward if you use the Porsche manuals but there are a few things that are definitely required,
a 30ton press,
a dial gauge with magnetic stand
feeler gauges
a very low value torque wrench
the wife to go out so that the kitchen oven is free !
loads of patience and time, the pinion and diff preloads and relative positions have to be set checked and reset a number of times. This requires a few trips to the dealers for shims which usually need to come from Germany and take a week each time.
All said, if you have the tools and patience then go for it, its good fun, unlike a torque tube rebuild which is a pain !
Cheers

Thanks. I have a friend with a press. It's how long I can afford to have it off the road thats the problem. If the box is coming off then I may as well do the torque tube bearings & clutch at the same time. Will see what credit crunch quotes I can get first.