Gearbox mounting change in situ

ronsealdeath · Dec 20, 2014

Hi all, going to swop out my transmission mounting rubbers next week for new ones as I suspect they are shot. Can't find amything in the manual or via a google search on this (maybe as its so simple :crazy

New ones look like this

I assume they only fit one way?

I also assume I can do this with everything in-situ by loosening nuts and jacking up the trans case, but will I start bending stuff if I do this and where is best to jack up the box? Back of h.brake drum and using a bit of wood under it the other side? Don't want to bend the handbrake or interior doing this!

robbh · Dec 20, 2014

I'd just stick an axle stand under the box and transfer box to hold it up then remove the gearbox crossmember to change them.

I don't think there is enough room (unless you have a bodylift) to lift the boxes far enough anyway,so crossmember out is probably the best way.

Plus you can check the chassis for rust where the crossmember bolts too. Probably the only place a disco chassis properly rusts away.

Pikey · Dec 20, 2014

Trolley jack under handbrake drum don't even bother lifting it just enough to support is enough. then unbolt crossmember 3 bolts thru chassis on each side IIRC. then undo mounting nuts and pull crossmember down.

ronsealdeath · Dec 20, 2014

Cheers both, will give that a shot.

jamesmartin · Dec 20, 2014

just jack transmission up as high as it will go remove gear box mount first and refit t/box one first as you can then lever transmission enough to help , you will need a decent 15mm spanner to remove mount plates from boxes, you dont need to drop crossmember

ronsealdeath · Dec 20, 2014

jamesmartin said:
just jack transmission up as high as it will go remove gear box mount first and refit t/box one first as you can then lever transmission enough to help , you will need a decent 15mm spanner to remove mount plates from boxes, you dont need to drop crossmember

Thanks James, so I don't do one at a time ;remove in the order you say and have both off at same time, then refit in reverse order?

I have a 15mm cranked ring spanner, would that do the trick or should I buy a C spanner in 15mm (which I haven't got)?

Sorry for all the questions, I have so little time to get under the landy I need to practically guarantee I can do something to the bitter end before I start it!

Cheers

jamesmartin · Dec 20, 2014

rhs t/box mount is hardest ie less room so it helps to have the other off,spanner sounds ok

Pikey · Dec 20, 2014

Drop the cross member much simpler. and easier to get at the mounts. especially if you don't have a fully equipped workshop to work in.

The Mad Hat Man · Dec 20, 2014

Pikey said:
Drop the cross member much simpler. and easier to get at the mounts. especially if you don't have a fully equipped workshop to work in.

if the bolts come out.

use plenty of coppaslip.

jamesmartin · Dec 20, 2014

the last few ive done i did out side in the yard with a bottle jack,crossmember is secured by 10 bolts 1 holding front exhaust hangar is quite awkward

Pikey · Dec 20, 2014

Just dropped crossmember off a 300Tdi to get engine & transmission out in one piece. there weren't no exhaust bracket on it. Just the thru chassis bolts. & mountings.

ronsealdeath · Dec 20, 2014

Thanks all, I'll just get the impact wrench on standby if I need to remove the crossmember.

I found this pic from the Defender RAVE after searching for ages

I'm guessing I could remove all but the bottom-most cross member bracket and just tap it down to sort of swing it forward/back enough to change the mounts then it would be easy to tap back in place as there would be one bolt locating it still.

I think what has happened on my disco is there is a blow in the exhaust near the mount on passenger side. I can smell burning rubber sometimes when driving and I think the exhaust has fried the mount! I get a really high pitched vibration from the transmission when pulling away at about 30mph in 4th. Suggests the mount may be letting things vibrate a bit. That's the theory anyway, we shall see.

jamesmartin · Dec 20, 2014

Pikey said:
Just dropped crossmember off a 300Tdi to get engine & transmission out in one piece. there weren't no exhaust bracket on it. Just the thru chassis bolts. & mountings.

what holds up the disco flexi front piped then as is std

Gearbox mounting change in situ

ronsealdeath

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