confused90owner Posted October 7, 2020 Share Posted October 7, 2020 Hi Folks, We have a 1995 Defender 90 300tdi, manual ok, I've recently purchased a 3.5v8 engine on carbs out of an SD1 Auto!, question is, will the original manual gearbox in our 90 mate up with the V8 Engine?, Regards. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted October 7, 2020 Share Posted October 7, 2020 Sadly not. You will need either an adaptor plate (if available) or to convert your R380 gearbox to V8 fitment (new bellhousing and input shaft). Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 7, 2020 Share Posted October 7, 2020 ...or just buy a V8 gearbox outright. Quote Link to comment Share on other sites More sharing options...
Arnie91 Posted October 8, 2020 Share Posted October 8, 2020 I have the R380 gearbox with a chevy 350 CI short block engine. Quote Link to comment Share on other sites More sharing options...
mickeyw Posted October 8, 2020 Share Posted October 8, 2020 There are R380 boxes that were built to go behind the 4 or 5 cyl diesel, and others built with bell housings and input shafts to fit the Rover V8. You just need the right version. If you get one that first lived in a Discovery you'll need to change the gear stick and selector assembly to the Defender type. Ashcroft transmissions (and probably other LR gearbox specialists) have all these parts. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 8, 2020 Share Posted October 8, 2020 3 hours ago, Arnie91 said: I have the R380 gearbox with a chevy 350 CI short block engine. Give that LR never dared fit the R380 behind the 4.6 Rover lump I suspect it could be a bit under-rated behind a 350 lump. Quote Link to comment Share on other sites More sharing options...
mickeyw Posted October 8, 2020 Share Posted October 8, 2020 1 hour ago, FridgeFreezer said: Give that LR never dared fit the R380 behind the 4.6 Rover lump I suspect it could be a bit under-rated behind a 350 lump. And yet you have an R380 and 4.6. All down to one's control of the right foot Quote Link to comment Share on other sites More sharing options...
Escape Posted October 9, 2020 Share Posted October 9, 2020 I also used an R380 with a 4.6, no problems or signs of wear (but not used long). I'm confident it will last with the 5.0 as well, given some mechanical sympathy. Filip Quote Link to comment Share on other sites More sharing options...
garrycol Posted October 9, 2020 Share Posted October 9, 2020 Didn't the US spec Disco 2 4.6 have the R380 as an option? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 10, 2020 Share Posted October 10, 2020 On 10/8/2020 at 7:09 PM, mickeyw said: And yet you have an R380 and 4.6. All down to one's control of the right foot Absolutely - but a 4.6 V8 is a very different thing to a 350ci lump of iron, you'll be able to lug it along in any gear and the engine won't care at all but the gearbox will be being twisted in half. Quote Link to comment Share on other sites More sharing options...
Arnie91 Posted October 11, 2020 Share Posted October 11, 2020 22 hours ago, FridgeFreezer said: Absolutely - but a 4.6 V8 is a very different thing to a 350ci lump of iron, you'll be able to lug it along in any gear and the engine won't care at all but the gearbox will be being twisted in half. It's been bellhoused directly onto the engine. Not sure if that makes a difference but the gearbox hasn't had any issues and its been thrashed about in the mountains of europe Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 11, 2020 Share Posted October 11, 2020 32 minutes ago, Arnie91 said: It's been bellhoused directly onto the engine. Not sure if that makes a difference but the gearbox hasn't had any issues and its been thrashed about in the mountains of europe Well I don't know how else you'd connect it, but no - the issue is a large displacement lump with way more torque across a broader range than the box was designed for. However, as previously said, mechanical sympathy and driving style comes into it hugely, plus the fact that a petrol V8 provides 8 smaller/smoother lumps of torque per rev compared to the large 4-pot diesels which seem to give LR boxes a bad day. Also the weight of the vehicle will make a difference. Quote Link to comment Share on other sites More sharing options...
Escape Posted October 12, 2020 Share Posted October 12, 2020 On 10/9/2020 at 10:17 AM, garrycol said: Didn't the US spec Disco 2 4.6 have the R380 as an option? I don't think the 4.6 ever came with a manual option, either in the P38 or D2. Unlike the P38, the later D2 with Bosch/Thor 4.0 V8 was available with a manual as far as I know. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 12, 2020 Share Posted October 12, 2020 A manual option in the states? Sounds like dangerous pinko libtard socialism talk to me. 1 Quote Link to comment Share on other sites More sharing options...
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