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windy81



Member Since: 14 Mar 2018
Location: North Wales
Posts: 311
Wales 1992 Defender 90 200 Tdi HT Firenze Red
200tdi Defender LT77 - downshift into 3rd is crunching
I was wondering if anyone who knows these boxes could help me.

The story is that I got the LT77 gearbox rebuilt to be 'as new' during rebuilding the defender, and as such all the bearings and baulk rings etc should be new.

Since getting the car working on the road it's been crunching into 3rd on the downshift from 4th. Always at speeds about 40mph or higher, nothing drastic, just regular downshifting into 3rd when slowing down.

I kinda prayed it would bed in and go away but it's not got any better over the last 5k miles Sad

At first I had the prescribed ATF Dextron II in it, tried Redline MTF but it's still the same. Bias springs are perfect and the rest of the gear changes are spot on. Up-shifting into 3rd is faultless, which is why I'm confused.

Since the baulk rings are new along with everything else, does anyone know why this could be so I can perhaps fix it myself ?? If that's even possible with simple tools.

Hopefully this gives the full details, if not let me know

Dylan
Post #793521 17th Sep 2019 8:57am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2277
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
Duff syncro ? Does it change smoothly down if you double declutch?
Ashcrofts recommend Dextron 3 in their rebuilt LT77 boxes.
TBH unless you want to pull the gearbox out and get it repaired, I'd use the brakes more and change down at sub-graunching speed

HTH
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #793597 17th Sep 2019 1:18pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1675
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
Did they replace the thrust washers in the hubs?
Post #793722 17th Sep 2019 11:34pm
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windy81



Member Since: 14 Mar 2018
Location: North Wales
Posts: 311
Wales 1992 Defender 90 200 Tdi HT Firenze Red
Mo Murphy wrote:
Duff syncro ? Does it change smoothly down if you double declutch?
Ashcrofts recommend Dextron 3 in their rebuilt LT77 boxes.
TBH unless you want to pull the gearbox out and get it repaired, I'd use the brakes more and change down at sub-graunching speed

HTH
Mo


I've tried to double and triple de-clutch and it doesn't make a difference.

I drive like you say, slow down to the slow speed then change to 3rd, but sometimes you need a downshift to 3rd when towing, regardless it should be working spot on after the rebuild.
Post #793777 18th Sep 2019 11:00am
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windy81



Member Since: 14 Mar 2018
Location: North Wales
Posts: 311
Wales 1992 Defender 90 200 Tdi HT Firenze Red
NickMc wrote:
Did they replace the thrust washers in the hubs?


I assume they did, like I said i had it rebuilt and my instructions were I wanted 'as new'.
Post #793778 18th Sep 2019 11:01am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2277
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
Indeed it should, I agree. Looks like it's gearbox out time and back to the rebuilder.
Have you spoken to them ?
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #793791 18th Sep 2019 12:23pm
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windy81



Member Since: 14 Mar 2018
Location: North Wales
Posts: 311
Wales 1992 Defender 90 200 Tdi HT Firenze Red
I have spoken but it's the hassle of it all.

In his words is he'll sort it out if I take the box to him, but that's the problem I'm not able to do that.
Post #793799 18th Sep 2019 1:20pm
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2277
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
I understand your frustration but unfortunately the only way to resolve the issue is to remove and return it for the remanufacturer to repair it Crying or Very sad
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #793800 18th Sep 2019 1:31pm
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windy81



Member Since: 14 Mar 2018
Location: North Wales
Posts: 311
Wales 1992 Defender 90 200 Tdi HT Firenze Red
My hope was that someone would know so i could fix it myself on the weekend.

Since the baulk rings are new could it be the gear itself ? What would you say ?
Post #793830 18th Sep 2019 5:40pm
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OJ



Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 121
Scotland 2015 Defender 90 Puma 2.2 XS CSW Corris Grey
Mo Murphy wrote:
I understand your frustration but unfortunately the only way to resolve the issue is to remove and return it for the remanufacturer to repair it Crying or Very sad
Mo


Agree with Mo Sad
Post #794283 21st Sep 2019 12:52am
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1675
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
There is no magic fix unfortunately. You’ll have to remove the box, unless the shifter is incorrectly adjusted.

Might be worth talking to Ashcroft’s I always find them very helpful.
Post #794404 21st Sep 2019 10:18pm
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