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Joeytf



Member Since: 20 Sep 2024
Location: Somerset
Posts: 42
United Kingdom 
M57 manual in 200tdi
Hello all, looking into putting a m57 in my 200tdi as the title says. My question is, would it fit in the standard lt77 seatbox and gearbox tunnel or would it need to be changed for the r380?

Thanks
Post #1074896 6th Sep 2025 7:25pm
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MarkBrown



Member Since: 03 Oct 2022
Location: Mid Wales
Posts: 574
Wales 1983 Defender 110 Other HT Auto Keswick Green
From what I understand the lt77 isn’t the strongest of gearboxes, so how long it would last behind the m57 I don’t know, I thought the m57 started at around 185hp? That said I had an lt77 behind a 165 hp V8 way back and it was fine. I’d guess that the m57 would make a fair bit more torque than the V8 though. I thought the r380 was a straight swap with the lt77 anyway? Just my thoughts. 1983 110 automatic OM606
Post #1074908 6th Sep 2025 10:15pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1327
France 2002 Defender 110 Td5 DCPU Chawton White
The (removable) tunnel piece and the shape of the seatbox cutout where it connects are different between the LT77 and R380 so they are not a straight swap.
Post #1074918 7th Sep 2025 7:36am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2389
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
If you are using a 6hp auto box then you can use the LT77 era tunnel. I believe (I fitted an auto) the manual BMW gearboxes need more room and require you to use an R380 tunnel.
HTH
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #1074923 7th Sep 2025 8:18am
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Joeytf



Member Since: 20 Sep 2024
Location: Somerset
Posts: 42
United Kingdom 
Thanks Mo, that’s what I was after!

Would you use a defender ratio transfer box or a disco?
Post #1074927 7th Sep 2025 9:55am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2389
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
It depends on which gearbox you are using and whethef or not you are using it for towing.
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #1074936 7th Sep 2025 12:21pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8396
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
From your thread question your fitting m57 to r380? So 185/narrow block?

And want to know if r380 gbox.will fit under lt77 tunnel? No.it won't.

Tbox ratio, depends on final gbox output, tyre size and diff ratios.

For cooling engine likes to be 2k rpm or just above. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1074985 7th Sep 2025 8:24pm
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