Cornish Rattler Posted December 9, 2016 Share Posted December 9, 2016 Hi guys We didn't get round to referbing the gearbox ( lt77 ) when we did the chassis swap but plan to once the 2a is finished but when we do I quite fancy fitting an R380 instead and just wondered whats involved, new Richards 4 cylinder chassis, fitted with a disco 200tdi engine what do you think. Quote Link to comment Share on other sites More sharing options...
western Posted December 9, 2016 Share Posted December 9, 2016 probably need a 'stumpy' R380 which was a update for 4 cylinder LT77 fitted vehicles. Quote Link to comment Share on other sites More sharing options...
Cornish Rattler Posted December 11, 2016 Author Share Posted December 11, 2016 Other than needing a stumpy would the gearbox and tranny box fit the same mounts, also which rear prop would I need Quote Link to comment Share on other sites More sharing options...
western Posted December 11, 2016 Share Posted December 11, 2016 Yes a stumpy R380 will fit the exsiting gearbox mountings, [my 110 has a 200tdii/stumpy R380] rear prop stays as well on a 90 conversion, but you might need a modified rear prop if the existing one won't fit. Quote Link to comment Share on other sites More sharing options...
Cornish Rattler Posted December 12, 2016 Author Share Posted December 12, 2016 23 hours ago, western said: Yes a stumpy R380 will fit the exsiting gearbox mountings, [my 110 has a 200tdii/stumpy R380] rear prop stays as well on a 90 conversion, but you might need a modified rear prop if the existing one won't fit. Thanks Ralph I will keep my eyes open for one, I hate the LT77 setup 1st and reverse are too close together for me 1 Quote Link to comment Share on other sites More sharing options...
Tractor Boy Posted December 18, 2016 Share Posted December 18, 2016 Like the idea of this as I dont like the LT77 for the reasons above. So if you use a R380 stumpy the propshafts are OK and dont need changing? What about other stuff like the gearbox tunnel? How many other bits will need swapping over. Ian Quote Link to comment Share on other sites More sharing options...
western Posted December 18, 2016 Share Posted December 18, 2016 Just the main gearbox when my first stumpy R380 was fitted back in mid 1994, the existing props/tunnel/floor plates are my orignal items. the upper gear lever & it's turret are common parts to both gearboxes. Quote Link to comment Share on other sites More sharing options...
Tractor Boy Posted December 18, 2016 Share Posted December 18, 2016 Thank you Western. 1 Quote Link to comment Share on other sites More sharing options...
Maverik Posted December 19, 2016 Share Posted December 19, 2016 Watch the ratios when buying your R380, I've still not quite worked out what I've got but it's quite different from the LT77 originally in. (My r380 being lower geared) - slightly disappointingly... Quote Link to comment Share on other sites More sharing options...
Peaklander Posted December 19, 2016 Share Posted December 19, 2016 Sorry for a novice question but what differences make it a 'stumpy' box? Quote Link to comment Share on other sites More sharing options...
Snagger Posted December 19, 2016 Share Posted December 19, 2016 The short bell housing and input pinion like the Defender version of the LT77. The Discovery and RRC had long nose versions. The R380 was made long for all applications, a short version specially made only for MoD retrofits. 1 Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 19, 2016 Share Posted December 19, 2016 It seems like an awfully expensive way to avoid adjusting the gear positions on the LT77. I don't have any trouble with 1st and reverse being too close together. The positions are quite distinctly seperate. Mo 1 Quote Link to comment Share on other sites More sharing options...
Scotts90 Posted December 19, 2016 Share Posted December 19, 2016 11 hours ago, Maverik said: Watch the ratios when buying your R380, I've still not quite worked out what I've got but it's quite different from the LT77 originally in. (My r380 being lower geared) - slightly disappointingly... So do you have a stumpy 380 fitted then Mav? I did the Ashcroft calculator and it showed there to be little difference in the Rev/mph tables between the 77 and the 380. I assume the calculator is using defender spec ratios, but I know you can buy the parts to convert the long nose variants. Again like most it's something I'd like to do as it seems to be a belt and braces upgrade....in all honesty though I have no issues with the use or selection properties of the LT77. The only issue I had was the gearbox detent spring getting gummed up and making reverse selection very temperamental, after a clean and lube it's actually very good now. Quote Link to comment Share on other sites More sharing options...
reb78 Posted December 19, 2016 Share Posted December 19, 2016 The lt77 and r380 have different ratios in fifth IIRC. The later Lt77S and r380 have the same ratios. Quote Link to comment Share on other sites More sharing options...
Maverik Posted December 20, 2016 Share Posted December 20, 2016 After owning the H reg stock 200tdi camel 110 and driving my truck as a comparison there was a huge difference in the drivability of the vehicle's, i.e. I'd found myself settled in to going along in 4th in the camel thinking I was in 5th... i started to look into ratios but never quite worked out what I'd got. Perhaps it was just me, but I don't think so. I'll have a think and maybe look at the box serial again. Quote Link to comment Share on other sites More sharing options...
Maverik Posted December 20, 2016 Share Posted December 20, 2016 After reading Ashcroft website I'm pretty sure mine is a 50A. When I purchased mine from AW transmissions I don't recall paying all that much attention to the ratio spec... (a rather serious schoolboy error) but in my defence I'd only known landies a few months at that point. Think I'll be putting some pennies away for the a higher ratio upgrade. - overdrive is a good idea but I can't be bothered with the extra hassle and noise you get from them. Quote Link to comment Share on other sites More sharing options...
Snagger Posted December 20, 2016 Share Posted December 20, 2016 Are you still using your Roverdrive after rebuilding it? I too find the transmission a fair bit noisier with it fitted, both engaged and disengaged. (though less than the howl of an engaged Fairey) The profile of the output gear teeth must differ slightly from the teeth on the original gear box output gear, as it's all noticeably quieter with that fitted. It does at least bring the engine noise down, though, so it's a trade off between the two that is in favour of the Roverdrive up to about 60mph, at which point the Series transmission and engine revs make quite a din. My plan is to retrofit a ZF and BW unit, giving just slightly increased top gearing over the existing set up and lower low range, plus the torque magnification of the torque converter, while having 4wd with a viscous centre unit and all much, much quieter and stronger than the current set up. Snag is that it'll put me under the 8 points for the radically altered vehicle score, losing the tax exemption. Decisions, decisions... Quote Link to comment Share on other sites More sharing options...
Maverik Posted December 22, 2016 Share Posted December 22, 2016 My Rover drive is presently sitting on a shelf waiting my wrath to calm down... after the full new bearing re-build, the mysterious whirring/tight spot has come back... I serious spat the dummy and nearly binned the thing off the bat... but I've got one option left to change out the main bearing for the one I got sent through from Canada, when I find a minute that will be the last shot, if it doesn't work after that then I'll be disposing of it. Quote Link to comment Share on other sites More sharing options...
Snagger Posted December 22, 2016 Share Posted December 22, 2016 Mine had a tight spot on the big main bearing - after cleaning the whole thing in a parts cleaner, that bearing squeaked on every turn and the tight spot could be felt. It cost me about £35 for a decent replacement. Quote Link to comment Share on other sites More sharing options...
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