LT95 gearbox ratio discussion - Defender Source
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  #1  
Old February 4th, 2016, 11:17 AM
Tallergypsy
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Ray Wood
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LT95 gearbox ratio discussion

I'm lucky to own a 1986 Australian built 110 fitted with the Isuzu 4bd motor and the LT95 gearbox. Over the last ten years I driven it extensively in Africa Europe and North America. It is the most reliable Land Rover I've ever owned.

On the 4000 Km drive back to Vancouver from the Arizona rally Last year I gave some thought to changing the ratios to give the truck better highway performance. I think it could cope with about 10 or 12 % lower overall ratio. An overdrive at 28% would be far too over geared to be useful which is the reason we don't make a Roamerdrive

There are no available lower transfer case gears available to swop as the existing ratio is already 1:1. It is not possible to cut some custom gears for the lower case as the diameter of the lower shaft is too big to accommodate a smaller diameter gear. You could replace both the front and rear diffs but that gets quite pricey and there is nothing out there quite right ratio wise

I'm thinking of cutting a myself a set of gears that would replace the upper two gears in the transfer case to bring the ration up by 12%. I don't this will effect the off road performance significantly as it such a low geared beast anyway. Anyone have any thoughts on this?

Ray
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  #2  
Old February 5th, 2016, 08:34 AM
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So, you would change the input gear and the intermediate gear? Kind of like the Ashcroft hi-ratio transfer box?
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  #3  
Old February 5th, 2016, 08:50 AM
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Once upon a time, there was an overdrive for the LT230.....

Overdrives

edit. There may be hope yet: http://rockymountainspares.co.uk/ds-roamerdrive/
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  #4  
Old February 5th, 2016, 08:55 AM
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Quote:
Originally Posted by Rocky View Post
Once upon a time, there was an overdrive for the LT230.....

Overdrives

edit. There may be hope yet: DS Roamerdrive - Rocky Mountain Spares
FYI, the OP is the owner of Roamerdrive.
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  #5  
Old February 5th, 2016, 11:56 AM
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David Short
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This is my favorite LT95 resource web page.

http://www.vislandrovers.nl/extra/re...versnel.php#v7

I concur with Ray's assertion about the lowest standard gears being 1:1 - I changed my standard gear set to the .996:1 gears in my Stage One. I run a pretty well sorted 3.5 and I think my gears are just a little too tall (especially when pulling my camper trailer). They are ok in normal unladen conditions.

With Ray's Isuzu motor - he probably has the extra power / torque to pull off a taller gear set.

I do not think there is much commercial demand for LT95 gearbox upgrades - but it would be a cool experiment.
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  #6  
Old February 5th, 2016, 12:35 PM
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Quote:
Originally Posted by Firemanshort View Post
This is my favorite LT95 resource web page.

http://www.vislandrovers.nl/extra/re...versnel.php#v7

I concur with Ray's assertion about the lowest standard gears being 1:1 - I changed my standard gear set to the .996:1 gears in my Stage One. I run a pretty well sorted 3.5 and I think my gears are just a little too tall (especially when pulling my camper trailer). They are ok in normal unladen conditions.

With Ray's Isuzu motor - he probably has the extra power / torque to pull off a taller gear set.

I do not think there is much commercial demand for LT95 gearbox upgrades - but it would be a cool experiment.
I do feel the Isuzu does pull well with the 1:1 gearset, but the gear gaps are right where i am comfortable. I'm not sure the truck will be as nice off the line with a taller first than it is.

I feel like a 1.17 ish gearset with an external overdrive, would be the best solution.

Ray, please be aware that the Perenties have a tapered roller bearing setup in the transfer case, and it is a different setup to a standard LT95 transfer case, I've only ever pulled a Perentie LT95a apart so I cannot comment on the exact difference. But i do know the replacement gears i bought were different than the standard LT95 gears.
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  #7  
Old February 12th, 2016, 10:36 AM
Tallergypsy
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Ray Wood
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Thanks for the input. I'm not to concerned about 12% up on the low range. Even in the Sahara with a full load in dunes it has never needed low range first. I'm aware that the Parenties have an improved intermediate gear running in tapered roller bearings. It is an extra op in machining to produce this but not difficult. If there is a market for this idea it would be in Parenties anyway. In civvy use they are lightly loaded and need help on the highway. I also agree that changing both the output ratio and then fitting an overdive would be a good solution but the costs prohibitive.

Ray
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  #8  
Old February 12th, 2016, 10:42 AM
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Dan Pollock
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I'd be interested in something like this. I do a lot of highway driving with my LT95 and 3.5.
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  #9  
Old February 12th, 2016, 10:58 AM
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Also interested same LT95 with 3.5

Fairey O/D's are still expensive and many worn out...

other options ?
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  #10  
Old February 12th, 2016, 12:11 PM
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Quote:
Originally Posted by Red90 View Post
FYI, the OP is the owner of Roamerdrive.
I didn't realize that. Apologies to you Ray.

In penance I have read up on Perentie. Its so desirable but I get your desire for higher top end gearing.

LandRover Perentie 4x4 and 6x6, designed for the Australian Army
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Old February 12th, 2016, 01:05 PM
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You mean how can we organize a group purchase ?

Buy land rover 110 Online - GraysOnline Australia
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  #12  
Old February 12th, 2016, 06:05 PM
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route back...

http://www.2wglobal.com/globalassets...-route-map.gif
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  #13  
Old February 13th, 2016, 07:52 PM
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Ray Wood
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I have to say that the ISUZU powered 110 is the most rugged and reliable Land Rover I have ever owned. (Mine is the civvy version) It is not quite as fast as the NA edition 110 we had a few years ago that got so stupidly valuable that I did not regret selling it. The Isuzu simply gets the job done, Robyn and I used it on five separate African trips and we've driven it coast to coast across the States nd North South Vancouver to Artizona.. The only things that have gone wrong with it are the alternator brush wore out in Namibia and the clutch started slipping at 300,000K. We also had to replace the thrust washers in the LT95 transfer case after an idiot in England put in GL5 oil instead of engine oil. I also have to say that the Australians did much better job of assembling it than the Brits do. There are some pictures of Matilda on the Roamerdrive website.

Ray
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  #14  
Old February 15th, 2016, 10:17 AM
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Just got a quote back from WW for RoRo of 6x6 from Melbourne to Port Newark about $6k USD, total vessel transit time about 2 months ... I guess picking it up Tacoma and driving across will be faster and cheaper. surely around 4k.
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  #15  
Old February 23rd, 2017, 11:03 AM
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Quote:
Originally Posted by Firemanshort View Post
This is my favorite LT95 resource web page.

http://www.vislandrovers.nl/extra/re...versnel.php#v7
David-

I have an LT95 on my modified Series 1. It's the 101 FC version with the shorter bell housing. Do you know if the info on the linked website is available in English?
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  #16  
Old February 24th, 2017, 08:33 AM
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A lot of web browsers have an auto-translate feature on them.

If you are serious about something - I wager that since the shop is Dutch - they speak pretty good English. A phone call would probably get you the answer you are looking for.
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  #17  
Old February 28th, 2017, 08:35 AM
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Quote:
Originally Posted by Firemanshort View Post
A lot of web browsers have an auto-translate feature on them.

If you are serious about something - I wager that since the shop is Dutch - they speak pretty good English. A phone call would probably get you the answer you are looking for.
Great help. Thanks!
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