Determine LT230 ratio from serial number - Defender Source
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  #1  
Old January 22nd, 2016, 10:31 PM
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Determine LT230 ratio from serial number

Is there a database out there somewhere that I'm missing that allows determination of transfer case ratio from serial number? I'm trying to verify its ratio - it's one I picked up from a board member. Thanks!



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  #2  
Old January 22nd, 2016, 10:40 PM
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Ashcroft, yours is a 28e... For some reason I cannot open the tech specs on my phone. If you have your lap top click on the lt230 and scroll down there is a layout of all the ratios based on serial numbers. Looks like it's a 1.22... F#%^*~!!!!
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Old January 22nd, 2016, 11:17 PM
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Yep, 1.22.

I had a feeling. The om617 is great but I barely ever spend much time in 5th gear. On the local hills I'm constantly shifting between 3rd and 4th to maintain 45mph.

Is it true that the ratio doesn't affect low-end? I'm having a hell of a time on hill starts... Really kicking my ass because of the low-power of the om617 before boost kicks in. Will it help when I finally get in a 1.4?
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Old January 22nd, 2016, 11:19 PM
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Brian Kandefer
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All low gear ratios are the same 1.22,1.41, and 1.6
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Old January 22nd, 2016, 11:30 PM
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Thanks gents.

------ Follow up post added January 22nd, 2016 11:36 PM ------

While we're on the subject - anyone have anything that shows the individual ratios of each gear through the 1.4 vs the 1.2? Just curious now
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Old January 22nd, 2016, 11:50 PM
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Gearbox ratios are here: Land Rover Gear FAQ

Why not just increase the power. You can do 250 hp.
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Old January 23rd, 2016, 12:07 AM
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Quote:
Originally Posted by Red90 View Post
Gearbox ratios are here: Land Rover Gear FAQ Why not just increase the power. You can do 250 hp.
True - but I don't think this particular om617 is a healthy engine. It can probably hold for many more miles stock; as they tend to do. Add more HP and maybe not!

------ Follow up post added January 23rd, 2016 12:10 AM ------

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Originally Posted by JSBriggs View Post
TeriAnns site has all the ratios. Land Rover gear ratios -Jeff
thanks... I'm going to have to try this tomorrow without whiskey... Too much math and numbers!
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Old January 23rd, 2016, 12:16 AM
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Quote:
Originally Posted by JSBriggs View Post
TeriAnns site has all the ratios. Land Rover gear ratios -Jeff
There are errors there and lots of missing info.

All possible options are in Ashcrofts ratio calculator and there are no errors.
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Old January 23rd, 2016, 07:14 AM
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Dave I have a guy that might be interested in the 1.2 if you decide to let it go
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Old January 23rd, 2016, 08:47 AM
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Quote:
Originally Posted by ontheway View Post
Yep, 1.22.

I had a feeling. The om617 is great but I barely ever spend much time in 5th gear. On the local hills I'm constantly shifting between 3rd and 4th to maintain 45mph.

Is it true that the ratio doesn't affect low-end? I'm having a hell of a time on hill starts... Really kicking my ass because of the low-power of the om617 before boost kicks in. Will it help when I finally get in a 1.4?
To clarify your low end question. The standard boxes all have the same low range gearing but the high range gearing is all effected. Ie 1st gear in a 1.22 is a full 30% taller than it was with your old 1.66 which is what I think you are asking.
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Old January 23rd, 2016, 09:49 AM
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Ok thAnks Doug, that does help. Everyone else was saying low-range selection on the XC stays the same... You've clarified that the 1.22 makes 1st gear much taller. That's what I wanted to know. This may seem elementary to some, but the inner workings of gear boxes and XCs is still akin to the realm of 'magic' for me.

------ Follow up post added January 23rd, 2016 09:49 AM ------

Quote:
Originally Posted by speedpin View Post
Dave I have a guy that might be interested in the 1.2 if you decide to let it go
I'll look for someone with a straight trade - especially in the NYC area
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