gt3 mk1 gearbox rebuild?

[gorisan26]

Hi folks, out of all the mk1 gt3's on here, who's had their box re built? also for what fault, was it covere by opc and what mileage?

thanks!

[7357]

I have not had mine re-built ?

I have read somewhere that a track'd MK1 will need the gearbox re-building @45,000 miles..

Why the qusetion ?

How many miles has your done ? Why do you think it needs re-building ?

[gorisan26]

just curious really, you always hear that they don't last much past 45k, i'm on 65k, seems fine but i assume it'll need doing in time! I'm covered by the opc warranty I assume but i can only renew that for another couple of years ya see!

[Slippydiff]

Main gearbox issues seem to centre around worn synchro rings, I stand to be corrected here, but the chances are Porsche won't stump up for a gearbox rebuild at 65K plus miles because your synchros are worn out. More likely to be viewed as fair wear and tear I'd have thought.
Hope I'm wrong though.

Slippy

[993rsr]

Gearbox rebuild @ 65k following the first rebuild @ 45k (previous owner elected to have brass synchros fitted again).

The weak link of these cars for sure, I've replaced the brass synchros with steel Motorsport items and added a gearbox oil cooler mounted in the front PU to ensure durability.

[andy tims]

Rebuild @ 42k miles - worn synchro's + needed new crown wheel & pinion

[7357]

andy tims said:

Rebuild @ 42k miles - worn synchro's + needed new crown wheel & pinion

Is the car track'd ?

What sort of money is the rebuild ? and who will doing it ?

[gorisan26]

7357 said:

andy tims said:

Rebuild @ 42k miles - worn synchro's + needed new crown wheel & pinion

Is the car track'd ?

What sort of money is the rebuild ? and who will doing it ?

2nd that, what sort of money are rebuilds?

[maximu5]

since I was having an 8/32 set fitted last winter, I asked the garage to simultaneously carry out whatever work seemed advisable to the gearbox (it still seemed to work fine to me; this was a precaution). A number of bearings were replaced (cost some 635 euros), steel syncros (this was the 2nd set already, 647 euros), further parts adding up to some 1000 euros. Cannot allocate labour, as more work was carried out. All gears and shafts were stlll in good condition. I had an aftermarket oilcooler fitted with thermostat set at 120 degrees. Seems to switch on egularly on track days, so I'm sure it is a good investment. My MK1 has some 45k miles and is tracked all the time.

Edited by maximu5 on Friday 14th September 20:36

Edited by maximu5 on Friday 14th September 20:36

[melv]

First Mk1 GT3 I drove had 4th > 3rd syncro prob at 11,000miles!!! Eeek!! Turns out previous owner was a race driver.....

Then learnt from a race team that prob they have with GT3 race cars is drivers not fully depressing clutch before taking car OUT of gear into next....

[gfreeman]

andy tims said:

Rebuild @ 42k miles - worn synchro's + needed new crown wheel & pinion

Ditto here....

Mine done by Andy Fearns, Andy's done by Russell Lewis.

Cost around £3-£4k I think.

[Henry-F]

20k miles, 3, possibly 4 rebuilds from memory now.

It will have no bearing (forgive the pun) on how many miles the car has done, totally down to how hard it`s driven (obviously the cup car gets a little bit of stick hence the reason we treat it to so many rebuilds). Steve Winter at Jaz is your man for gearbox rebuilds.

Henry

Edited by Henry-F on Saturday 15th September 15:05

[7357]

Before I brought mine.. PARR did a PPI and said the gearbox was very strong.. (16,000 when I brought her)

I have a short shift on her(been on from New), and have been told this should be removed ??? Don't know why ??? Any Views..

[Dave 321]

Just had my box done in JZ last month. 82k miles. I think its the first rebuild as i know the history of the car since 40k miles. Mine needed a bearing, new 2nd gear/synchro, sliding hub magnesium thing?? and a few small bits..

[gorisan26]

Dave 321 said:

Just had my box done in JZ last month. 82k miles. I think its the first rebuild as i know the history of the car since 40k miles. Mine needed a bearing, new 2nd gear/synchro, sliding hub magnesium thing?? and a few small bits..

sounds like jz is the place, how much did that cost ya? was it the full job or did they want the box out?

[Slippydiff]

7357 said:

Before I brought mine.. PARR did a PPI and said the gearbox was very strong.. (16,000 when I brought her)

I have a short shift on her(been on from New), and have been told this should be removed ??? Don't know why ??? Any Views..

Fitting a short shift allows you to move the selector forks quicker than you can with the standard lever.
This in turn means you are expecting the synchro hubs to do their work (syncronise the two gears) in a shorter space of time than with the standard lever (and more often than not with more pressure applied to them as well)
The end result can be that the synchro hubs wear out more quickly.

Slippy

[Slippydiff]

gorisan26 said:

Dave 321 said:

Just had my box done in JZ last month. 82k miles. I think its the first rebuild as i know the history of the car since 40k miles. Mine needed a bearing, new 2nd gear/synchro, sliding hub magnesium thing?? and a few small bits..

sounds like jz is the place, how much did that cost ya? was it the full job or did they want the box out?

Give the lads at Fearnsport a ring, tell 'em Slippy sent you (they're very competitive on price)

[andy tims]

gorisan26 said:

7357 said:

andy tims said:

Rebuild @ 42k miles - worn synchro's + needed new crown wheel & pinion

Is the car track'd ?

What sort of money is the rebuild ? and who will doing it ?

2nd that, what sort of money are rebuilds?

I got the car about 2 years ago with 33k miles on the clock & minimal track use to that point.
I have done about 15 track days in it so far. I do have a short shift kit, but am not hard on the box.

The work was done by RSR Engineering in Grayshott & cost £4,300 including the extra cost of fitting Cup selector cables, which is a worth while operation as these are much thicker & stiffer than the standard cables & so make the change even more possitive.

[Dave 321]

gorisan26 said:

Dave 321 said:

Just had my box done in JZ last month. 82k miles. I think its the first rebuild as i know the history of the car since 40k miles. Mine needed a bearing, new 2nd gear/synchro, sliding hub magnesium thing?? and a few small bits..

sounds like jz is the place, how much did that cost ya? was it the full job or did they want the box out?

They took the box out to check an oil leak for me. Replaced the clutch and the few bits. £3.5k I asked them to change whatever needed changing and thats how much it was.

Oh, I had the diff rebuilt 6 months earlier so that wasnt included in the price..

Edited by Dave 321 on Sunday 16th September 11:20

[gorisan26]

so its obviously not covered by the opc warranty then?