Leaking from Transmission Extension Seal Area

[fernsantos]

AU2 6cyl Auto Fairmont Ghia
Just got the car serviced and the mechanic wrote on the bottom of the invoice that it is leaking from the transmission extension seal area.

Is this a big job to do and is it costly.
I am getting an auto transmission service done soon can it be done at the same time.

Any help will be much appreciated.

Regards

[frd906]

i just did mine all up cost me 100 bucks, make sure you get your UNI joint done as well,

mine was flapping around in the gear box and ripped the main seal out

new seal, new extenstion housing seal, new uni join with a grease nipple, new shim or wateva its called which goes over the yoke plus labour cost me 100 bucks

[Mr Hardware]

Is this a big job to do and is it costly.

Why didn't you ask the mechanic???

No and no is your answer.

[frd906]

man i got mine done for 100 bucks mate rates, a mechanic will charger a arm and a leg

[blueoval]

yes, is cheaper for an transmission specialist to do it for you.

Make sure its a brass fitting. This will last the lifetime of the car.

The factory units were made from cheaper inferior chinese fittings due to cost savings. They are meant to last only a certain period of time. The brass ones are far more resilient and once done, you can forget all about it.

[gregaust]

Most likely cause of seal failure is a worn bush, as mentioned above there is a BRONZE type rear bush is much tougher than the original types that wear pretty bad . Is easy done with extension housing removal. Special tool is needed to press the bush in .

[Erich]

Originally Posted by gregaust

Most likely cause of seal failure is a worn bush, .

What bush you talking about? Did I miss one?

What they are saying I think is a "speedy sleeve" is inserted on the yoke of the tail shaft to allow a nice surface for the new seal to run on as the yoke would have a groove on it - hence combating the seal leak.

Likely problems would have been seal creating a ridge in the yoke or worn Uni joint etc which will have play and end up streching/elongating the seal

[gregaust]

There is a bush in the back of the extension housing in front of the seal. It is very common for them to wear bad in these 4 speeds . A new bush , a new seal and a nice smooth gearbox yoke is the fix. A speedy sleeve is NOT suitable for the tailshaft yoke

[Jastel]

What Greg said

Get the brass/bronze bush they use in the V8's

To change bush drop tailshaft, (check uni joints while disconnected but they do 2-300000km normally) 4x 12mm bolts undo extension housing, (may have to undo some counterweight bits cant remember back to AU 100%) find suitable socket and knock bush out. Knock new bush in , make sure same way as old one to line up oil hole, new seal as well, reassemble.

[Erich]

then what if the yoke has a groove in it? Ive fitted quite a few - and they are a lot cheaper than replacing the yoke. Never had a car that is "not suitable" for a speedy sleeve

Didnt know about the brass yoke - I dont work on late model trans

[Erich]

ty Jastel & gregaust - didnt know about the bush

[gregaust]

The way to tell what bush is the original are a grey colour and a soft type whitemetal sort of lining. Not uncommon for most of the bearing lining material to be worn away to the steel backing .The bronze types are much more robust and of course are a coppery bronze colour lining.
If there are grooves worn in the yoke you'd be better IMO to source a new yoke . Speedy sleeves work well on narrow fixed running surfaces but never seen one on a yoke that moves/slides back and forward if that makes sense..

[Erich]

it does - and yes - speedy sleeves are an inteference fit and stationary - they bind to the yoke

[fernsantos]

Got the job done today total cost $440 maybe a bit on the expensive side but i am happy with the place i took the car to.

Auto service
Fluid flush
Supply & Fit rear transmission oil seal(brass)
Supply&Fit new rear extension bush

Thanks for everyones input.

[frd906]

yeh $440 is a bit steep, oh well at least you got the job done

[blueoval]

I think the extra dough would be in the flush. But good to know you can rest easy.

[The Monty]

$440 is right on the money including a flush. At least its all fixed now. On a side note, just to do the extension housing seal for me for the first time took about 20 minutes with the car on the hoist and cost $16.95.

[BIGJB]

$440 definately the right $$ for the work done.
Best of all you know it's all done and right now.

[Mr_4.0]

they are ven more prone to doing the extention housing bush when you have lower diff gears also. i have 4.11's and am getting my 2 one in 50,000 km's done

[The Monty]

Im sure with me, launching on slicks probably didnt help it much, lol.