Vehicle & Technical > Defender

Gearbox identification

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zulublue:
Hi Chomp,

I am just going through the same thing with my LT77 gearbox and LT230 T-Box (LT-230 was knackered), Solihull Mick gave me good price for doing the work, but as I am off on holiday very soon I cannot stretch to that as well, I managed to get a second hand T-box off a MC member which seems to be good, but I know there is a common problem with the splines on the mainshaft in the gearbox which wears down, I took my T-box off today and yes the splines had almost gone on the G-box, my mate had a spare gearbox and t-box, but we split that and the splines were gone on that also.
So I need either a recon box or a repair my original. due to funds I think a new mainshaft and seals will be the way to go, quoted £175 for a replacement and fitting.

So if I was you, before you fit the unit in to your 90, I would take 20 minutes out to split the t-box from the G-box and check the splines, they should be flat on the top and not worn to a 45 degree angle like mine, I know its a pain, but it will save you a lot of time and money in the future.

Mark.

Chomp:
Hi Mark - I'll be removing the tansfer box one night this week, so I'll look then - thanks for the 'heads up'  :)
 I'm also waiting for a new clutch, prop shalft bolts etc to come. I was recommend to replace the clutch while the box was out, so I thought I'd give it a go

Mark - is there a gasket between the transfer box and the main gearbox? Just would like to know before I start work on it . I'd rather have all the bits in front of me, rather than find out when Ive taken it apart and wait for the bits to be delivered

Mark

Range Rover Blues:
No mate, the T-box and G box fit with a sealing compound.  That said there is also an oil seal on each so you are effectively sealing a dry space.  If you look hard you should find there's a drain on this space, to let oil out if it leaks.  The space just prevent mud getting to the gearboc oil seals whwre it can't be cleaned off.

Any sealer will do, I used a silicone sealer but red hermetite, instant gasket etc etc will do the job.


Later LT230s had a cross-drilled gear in the T-box to prevent the spline wear, recon boxes should have the same gear.  It's worth noting that the B_W T-Box doesn't cause this wear, so boxs from RRC are a good bet second hand from that point of view, though I think they are a different length to the Defender box (V8 and TDi are different to each other).

Chomp:
Thanks for the advise Range Rover Blues, "every little helps" ;) :grin: :grin: :grin:

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