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  #1  
Old November 14th, 2012, 06:41 PM
maleger
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Marc-Andre Leger
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T-case advice

What transfer case should I buy for my Defender restoration ?

I can get a 1.2, 1.4 or 1.6 from a canadian D-90 board member relatively close to me.

I'm looking to put a diesel engine. I'm considering either a 300TDI, International of Isuzu. I have not yet made a final decision. I would put a (new or rebuilt) R380 to replace my LT77S. Likely with KM2's in the 235/85R16 size.

As a reminder of what I'm planning for this winter: I'm rebuilding off a new galvanized frame that I'm getting ready to order with a new Wolf bulkhead I just bought from the UK and installing new wiring harness, new (or rebuilt) axles and all the stuff I already have (Bumper, winch, TF suspension, HD steering members, etc.). I think I want to get all the body panels repainted while off the old truck with new capping and I'm keeping the NAS roll cage, other NAS specific stuff and the VIN...
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  #2  
Old November 14th, 2012, 06:47 PM
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Paul
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Transfer case ratio depends upon overall gearing, tire size and engine rpm/power curve. On my 4BD1T, I opted for 235 85 R 16, stock gears, and .9962. Run the numbers. FYI: Ashcroft has a nice ratio calculator http://www.ashcroft-transmissions.co...atio_calc.html.
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Old November 14th, 2012, 08:06 PM
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John B.
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90 or 110? How much stuff do you carry? You need to decide on engine first.....
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Old November 14th, 2012, 08:33 PM
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Mike
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With a 300 in the flats the 1.2 would do fine, go with the 1.4 if you are going over the mountains. The 1.6 might wind you out to quick but better in the mountains..
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Old November 15th, 2012, 05:23 AM
maleger
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Marc-Andre Leger
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Quote:
Originally Posted by Red90 View Post
90 or 110? How much stuff do you carry? You need to decide on engine first.....
I have a 1994 D90 NAS. Sometimes followed by a trailer.

------ Follow up post added November 15th, 2012 05:24 AM ------

Quote:
Originally Posted by MC22958 View Post
With a 300 in the flats the 1.2 would do fine, go with the 1.4 if you are going over the mountains. The 1.6 might wind you out to quick but better in the mountains..
I guess I do go over mountains some times... but I really need to choose an engine !

------ Follow up post added November 15th, 2012 05:29 AM ------

Used the Ascroft calculator... 1.4 would be great, if I put an overdrive... something I was thinking about doing.
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  #6  
Old November 15th, 2012, 10:35 AM
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Quote:
Originally Posted by MC22958 View Post
With a 300 in the flats the 1.2 would do fine, go with the 1.4 if you are going over the mountains. The 1.6 might wind you out to quick but better in the mountains..
I don't really agree on this. The gearing is much more set by first gear. Top gear does not matter much. You can always shift down.... The power curves on the 300TDI is quite flat, so once up over 2000 rpm, gearing does not matter a huge amount.
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Old November 15th, 2012, 11:45 AM
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Quote:
Originally Posted by Red90 View Post
I don't really agree on this. The gearing is much more set by first gear. Top gear does not matter much. You can always shift down.... The power curves on the 300TDI is quite flat, so once up over 2000 rpm, gearing does not matter a huge amount.
You're right, I'm running a souped up Td5 with a 1.2 and 35" tires. Everything is great except for 1st gear. Highway RPM (and mileage) is awesome, but taking off from a standstill is challenging. I'm either going to have to go with 4.11's or go back to a 1.4 box.
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Old November 15th, 2012, 05:00 PM
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I find my 110 with 235/85 track edges,1.222:1 transfer box and 3.54:1 diffs is Ok pulling away in first and cruises well enough, slows for long hills though. Oh and it's got an LT77 main box, no I don't know the serial number, I think they have slightly different ratios too.
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