1.410 or 1.22 Transfer Case Question - Defender Source
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  #1  
Old March 10th, 2014, 06:50 PM
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1.410 or 1.22 Transfer Case Question

I wanted to get some opinions on keeping my existing 1.410 or swapping to a 1.22 transfer case... I hear that the 1.22 is better for highways but any opinions on city driving?

Truck is a 110 currently running on 235/85R16 but may change to 285/65/16. 4HP22 Gearbox on a 3.9 v8.

I'll be using the truck equally on the highway between MA and NJ but will also be driving it in major cities such as Boston and NYC. Thanks.
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  #2  
Old March 10th, 2014, 06:52 PM
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What model truck. What tires. What gearbox. What engine.
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Old March 10th, 2014, 07:07 PM
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updated the thread with more info.
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  #4  
Old March 10th, 2014, 07:16 PM
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Get the 1.22. It makes a Defender so much nicer to drive every day.


I have a 1.22 transfer in mine with 33x12.5 tyres and find it fine. Probably would start getting abit tall alright if I was using 35s all the time though.

I've a TD5 with about 500Nm torque so able to pull the taller gearing easy enough. the V8 should have no problem either though.
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Old March 10th, 2014, 07:22 PM
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I run a 1.22 and it is the tits on the highway! if that's your plan (to do some highway driving) then definately do it.

Just bear in mind if you want to add bigger tires or more weight (i.e. rollcage, roof rack, tent etc.) it may be a bit sluggish getting up to speed. Maybe not with a V8, but I don't know how tired your V8 is, or if you're running FI vs. carbs.
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Old March 10th, 2014, 07:37 PM
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Not sure how many above have driven a v8 auto 110. Comparing a tdi r380 truck to a 3.9 auto is like comparing seedless green grapes to a pineapple. Depends on the 110 too. A 5 door is quite a bit heavier than a 2 door soft top or pickup. With an old 3.9 and autobox I'd use a 1.4. Will the truck be fuel injected or carburated ?

With a diesel and a manual a 1.2 works. If you lived in Florida or Kansas where its flat a 1.2 may suit with the auto. If you are anywhere where hills are common you are going to be adjusting your downshift cable up tight so it downshifts early on hills so its not a slug. But that's just one mans opinion.
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  #7  
Old March 10th, 2014, 07:54 PM
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Stock diffs?

There should be no guessing here. Calculate your final drive ratio in top gear and tire size, and note your current RPMs. Run the numbers with different configurations to see how it affects your RPM and then you can make a decision based on the data.
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  #8  
Old March 10th, 2014, 08:29 PM
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My Disco ran well with 3.9/auto 1.22 and 255/85-16. Its not like any "traditional" LR is a rocket ship.
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Old March 10th, 2014, 08:48 PM
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I used the ashcroft ratio calculator to figure out my final drive with 35" tires . Its kinda fun to play with .

http://www.ashcroft-transmissions.co...atio_calc.html


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  #10  
Old March 10th, 2014, 08:58 PM
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I would say no as well. Nothing will help the mileage and that is too much gearing for a 3.9 and a 110.
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  #11  
Old March 11th, 2014, 12:26 AM
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Thanks. This will be a 4 door NAS 110 with 235/85/16 so 31" tires and stock diffs. I'll be honest and say looking at the ratio calculator I am not sure what I should look for.

It shows that at 70mph on the 1.4 I'll be at about 3k RPM where the 1.2 will leave me around 2.5k RPM. That tells me better fuel economy on the highway but how does the car perform on city streets? Stop and go?
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  #12  
Old March 11th, 2014, 01:13 AM
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you won't be able to tell around town, unless maybe you are towing something.


Why did a 1.4 case end up in the rover?
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Old March 11th, 2014, 01:51 AM
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The 1.4 case came from the factory
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  #14  
Old March 11th, 2014, 03:54 AM
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I have a 1.2 on my 110 (Td5, tweeked, standard gearing otherwise, and 235's)

Pulls very well. 1st is slightly overgeared, but nothing bad. If it stick my 255's on, then 1st does become pretty useless for steep hill starts, but it takes all of 2 seconds to slip into low range, pull away in 2nd low, then shift straight into 2nd high. easy.

When I towed my new G wagen back last month (SWB 280GE is anyone's interested... my next project!) I had to use low a couple of times on hillstarts even on 235's, but once I was moving it was no problem.

Mind you.... even a SWB G comes in at about 2300KG!!!
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Old March 11th, 2014, 07:23 AM
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Quote:
Originally Posted by robertf View Post
you won't be able to tell around town, unless maybe you are towing something.


Why did a 1.4 case end up in the rover?
All NAS 110's came with 1.4's- they are very heavy. In fact most all 110's with lt230's have 1.4's, Td5's could be special ordered with 1.2's as the computer controlled diesel has incredible torque compared to the rest of the anemic crap offered. In the case of the sub 100 hp engines, those trucks got 1.6's.

How easily does the truck maintain 70mph now ? A 1.2 is 15% taller gearing- kind of like putting 35 inch tires on. Do you feel that your current engine would pull those down the road well @ 2500 rpm ?

The 110 I built last fall with a 4.6 and auto I re-used the 1.4 and was glad I did when I drove it the first time.
A 1.2 will get you ever so slightly better highway mpg , although you will use more fuel getting up to speed.

A 1.4 will make the truck fun to drive, a 1.2 will make it a dog. You already have a 1.4.

Are you driving a NAS 110 for its fuel economy ?

Again just one mans opinion but I have been here done this with a larger engine.
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  #16  
Old March 11th, 2014, 03:39 PM
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This may not be entirely related, but for some added perspective... I swapped a 1.4 LT230 into my '96 Discovery years ago (1.2 was stock). It was on 235/85-16's (32") and the change essentially negated the tire size increase (it was a 5 speed manual as well). I also towed a 3500 lbs boat frequently at the time, and it was a wonderful combination. It turned almost exactly 3,000 RPM at 70 mph, and for the 4.0 V8, that put it right in the fat part of the torque curve, and I rarely had to down shift for anything but a true hill..
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  #17  
Old April 5th, 2014, 07:12 AM
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I agree with Doug.. Been there done that. I would not do it. Your truck will be a dog and try taking off on a hill. Unless your doing an LS sway that will not work.
I have found if you need extra gearing for the highway, the rover drive overdrive is the way to go. I have one and installed several. You get to keep your stock gearing for around town but when on the highway, you have a 6th Gear to shift into..
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  #18  
Old April 5th, 2014, 08:02 AM
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Just a thought Daniel, if you plan on going to 285, then that's probably similar to going to 1.2. No I haven't done the math.
It's a lot easier and cheaper to swap tires.so just flip the tires for now and see how it drives.
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  #19  
Old May 14th, 2014, 10:56 PM
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Just an update for anyone interested. After lots of back and forth leaning towards the 1.410 I decided to go with the 1.22 TC. Just did 210 Miles Highway going 70 mph at 2,200 RPM's and 40 Miles Stop and Go City all on 15 gallons. Yes my gauge works.

Thanks again for all the comments above. It definitely helped me through the thought process and as mentioned I was leaning towards the 1.410 the whole time. I did like the idea of lowering the RPM's on the 21 yr old engine but also didn't want the truck to be a slug.

So what did I do? I did what this board recommended. I test the 1.22 first with both 235/85/16 and 285/65/16 going up, down, stop, go, highway, local and it was great. It pulled as quick as the next car on the road and probably has more pull that my first car. It didn't help that I took Nicks LS for a spin between test drives but nevertheless it's was fun to drive and was not a slug. It keeps up with any steep hill I've throw at it, and now I know I can put 285's on and it'll still be fun to drive. At the end I decided the 1.22 was perfect for me and did not put the 1.410 back in.

Once again thanks for all your opinions.
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  #20  
Old May 15th, 2014, 02:42 AM
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And any really steep hill starts or trailer pulling away, you can always just move off in 2nd low, then slip into high range.
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