Alberta Land Rover Enthusiasts Club Forum
General => Technical Discussions => Topic started by: pechanec on January 29, 2017, 06:34 PM
Anyone know if the front output housing of a regular 1.2:1 case will work on a 1.6:1 military case? I have 2 partials , hoping to make a whole mil- spec case. Also, any recommendations for a shop in Edmonton area to rebuild ( told the bearings are done in the 1.6)?
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Bert can do that....and it's quiet now. ;)
Don't know about the fitting question though.....to far above my pay grade hahahhahhah
You would need to investigate a lot further. The problem is not the ratios. The problem is the suffix of the box as things changed through the years.
There is no such thing as a "mil-spec" case. They are the same as used on civilian trucks.
Just happens to be army green is all
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"army green" as in dark green? OR "army green" as in pale puke, be very afraid AVRO did the repairs green????
Dark green, still has Wolverhampton tag
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Dark green. Still has Wolverhampton tag
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So, you want put the lower geared case in a Discovery?
I guess I should ask, why are you wanting to swap front output housings?
Missing from the lower geared case
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When you remove the front output housing the output gears come with it along with the center diff. What parts from the 1.6 lower end are you more specifically missing? That will help determine if you can make up those parts from a 1.2.
Front output segment, which I'm thinking should be just the output bearings and locking mechanism/diff. All main gear sets should be in main body of case , no?
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Quote from: pechanec on January 30, 2017, 10:49 AMAll main gear sets should be in main body of case , no?
The shaft that the center diff is bolted to is what supports the output gears and the shifter. If you are just missing the housing itself with output shaft, maybe it will work. You would need to know every little difference that happened through the years or just try and see. At a minimum, if it works, the bearing preload would need to be checked and adjusted with shims. I can't imagine anyone has ever needed to try what you are asking, so it would be doubtful you will know without looking at it yourself.
If you do go down the route of a local rebuild, get a quote first and compare to bringing in a rebuild unit. If you bring one in, I would consider changing to a 1.4. You will be much happier with the higher gearing, IME.
Thanx for the info
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I would second John's suggestion re the 1.4 gearing. Unless you're trailering the unit around, the 1.6 makes for some pretty slow highway driving.
I'd have to run the math, but the idea is reduce gear hunting in the transmission, as it's on 33 inch tires and I'm leaving the factory axle gears
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10percent bigger tires and 0.4 drop in drive ratio should be not too bad @ 100 kmh
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Quote from: Trevor on January 30, 2017, 12:38 PM
I would second John's suggestion re the 1.4 gearing. Unless you're trailering the unit around, the 1.6 makes for some pretty slow highway driving.
That is what I was thinking. Most folks regear the diff to regain lost performance due to tyre size etc.
That way you can address differential carrier weakness and improve the off road performance as well as on road at the same time.
Edit, that is to say high and low range performance.
True. Axle gearing change is expensive. Rear carrier already addressed with Detroit locker swap, plus, I haven't had any issues with the factory diffs as is. And I have the cases laying around
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I hear ya. That's part of the reson the Mighty Range Rover on 33" tyres still runs factory axle gears.
Let's a person keep the lift small (growlers is 2.25 inch) for better stability also
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Quote from: pechanec on January 30, 2017, 12:45 PM
I'd have to run the math, but the idea is reduce gear hunting in the transmission, as it's on 33 inch tires and I'm leaving the factory axle gears
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I'm running 33" (255/85R16) on my CT Defender and can clip along very nicely at 100 - 110 km/h. I do not find it lacking in power at all, it is quite nice to drive in both the city or highway (well, for a Defender that is, relatively speaking of course).
I also run the stock gearing in the axles (salisbury rear, and rover-diff front). Only change to those is a pair of TruTracs and Ashcroft chrome-moly axles....but gearing is stock.
Yes, mine is on 285/75 r16. Cruises OK at that 100/110 mark also, but a little lacking when trailering (2000 lbs ish) up hills on road. Fine off road in low range.
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My Rangie is on similar 285/75R16 GY Duratrac tyres, stock gears, an ex-Disco T'case and it works ok. It's a V8 so HWY speeds of 110-120 are attainable and the tall gearing and tall tyres help the rpm and mpg on a long run. My only gripe is the lack of engine braking in low range when descending a steep hill with the auto box. Even when you hold the transmission in 1st gear it has a tendency to run away on me a little. Makes me use the service brakes more than I'd like.
I have noticed that as well
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