Gearbox grinding 172 help please

[shane159]

Hi guys,

I've bought a 172 for the track and after a good spirited drive I've found that the gearbox seems to grind on fast changes from 2nd into 3rd and then 3rd into 2nd, the car has been stood for about a year so just wondered if I could just get away with changing the Gearbox oil or does it sound like the gearbox is goosed?

 

[MonkeyKnifeFight]

Syncro trouble is highly common. My car had this problem and the box eventually let go. If you can get the box out www.burpspeed.com do a well priced refurb from what im led to believe.

 

[Silent_Scone]

They use Agency transmittions

 

[MonkeyKnifeFight]

Thats the one. My bad.

 

[Silent_Scone]

its also transmissions

iPhones are gay

Agency Transmissions (Services)
Shrub Hill
Worcester
Worcestershire
WR4 9EL (Road Map)


Tel: 01905 24896

 

[DominicJeans]

mines been like that for 30,000 miles but it's a lot better after it's warmed up. Led to believe it's a common fault. I am gonna go for a gear oil change to see if that helps. Someone on here said taht the oil absorsbs water over time making it more viscous than it should be and that a change will help.

 

[Budgie]

PMSL at having a crunch for 30k miles and only then thinking about an oil change.

 

[Chip-mk1]

Your best bet is to change the box oil straight away and then just have a bit more mechanical sympathy changing gear that you normally would to prolong the life.

 

[Silent_Scone]

Changed my box oil last month as I've got second gear syncro problems on a relatively new rebuild. Has definitely helped. Pretty much consumables on these cars really, just have to be firm but gentle lol

 

[Tony Hunter]

Syncro trouble is highly common. My car had this problem and the box eventually let go. If you can get the box out www.burpspeed.com do a well priced refurb from what im led to believe.

LOL, I'd take it to bits, but that would be about it.

 

[DominicJeans]

well, I did the gear oil change..sadly made it worse in that in doesn't get better when warmed up. I suspected that may happen. Next time I'll go with ny hunch. Could it be because I used 75w/90?

 

[DominicJeans]

well, I did the gear oil change..sadly made it worse in that in doesn't get better when warmed up. I suspected that may happen. Next time I'll go with ny hunch. Could it be because I used 75w/90?

 

[shane159]

Changed my oil and made no difference at all, but did a full trackday at donnington with just the grinding and the gearbox holding out to the very last lap, at that point it was also jumping out of 4th.

I ended up removing the gearbox myself and sending it off to agency transmissions as Reccomend on here.
I can't tell you how chuffed I'am with these guys, what a quality service they offer!!!

Got the box back on Friday and fitted it on saturday along with a new clutch and the car is spot on now.

 

[DominicJeans]

sounds good! How much did the 'box cost for the refurb? You do the swap yourself?

 

[shane159]

£20 for courier on way there, £275 for everything the box needed (was quite abit) £60 to get it back by courier (wanted it back here before the weekend)

Yeah did the swap myself and was quite surprised how easy it was to do.

 

[DominicJeans]

ok, so that's not so bad then! Cool.... I have nowhere I can take the box out (or the skills) so would need help with that, but all in all... not as bad as I feared.

 

[DominicJeans]

clearly rather not have to do it though!

 

[Tony Hunter]

Agency are good.