how to test an LT77 out of the vehicle - Defender Source
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  #1  
Old July 28th, 2013, 11:12 AM
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Clark Bowen
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how to test an LT77 out of the vehicle

How would I test a LT77 gearbox and attached t-case that's not in the vehicle?
What should I look/listen for?

Thanks
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  #2  
Old July 28th, 2013, 12:03 PM
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Paul
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Was it run recently? If not, pull the lt230 bottom plate and look for rust and or pitting on the gears. Check for spline wear on the input and output shafts.
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Old July 28th, 2013, 02:40 PM
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Clark Bowen
1969 Series 2a/OM617 Bugeye 88"
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Hello Paul......

Good chance to tell you how much I enjoy your 88" Bugeye. It is so nice to buy a well maintained LR.
I checked with Turner and the motor was built by them with a 2.5 litre cam and gas flowed heads and it is the strongest running 2.25 litre petrol I've ever owned or driven.
I had the chance to buy a 200 TDI and an LT77 from an importer in Portland and I'm considering replacing the stock trans and overdrive with the LT77 but I wanted to test it first.
The only reason I'd swap out the existing trans/t-case/overdrive is that I'm concerned the TDI will be too much for it.
I know the LT77 is about 4" longer so I may have to go to a double cardan propshaft.
I'm not exactly sure what to feel for as I twist the input and output shafts. Can you tell me.

Clark
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Old July 28th, 2013, 05:29 PM
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I went through the mental math for the 200 tdi conversion a few years ago. In short, IMO it does not make sense unless you are keen to do a major overhaul of the vehicle. My rationale was that the 200 tdi is too powerful for the SIIA transmission over the long term. Therefore, I would want to replace the transmission as well. With either an lt77 or r380, one could get an adapter kit for the series transfer case or they could use an lt230. The adapter kits are sporadically available and spendy. An lt230 is full time 4WD and the series front axle ujs may not be up to the task, or so I have been told. If so, then a cv front axle and the resulting steering link issues with a coil sprung axle on a leaf sprung axle...it led me to a complete drive train replacement, engine through axles...not worth it for me. It would change the character of a great series rig. Ymmv
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Old July 28th, 2013, 07:28 PM
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Clark Bowen
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Thanks.
Well put.
An alternative is to use the 200 TDI as a DI (no turbo). I believe that overcomes most of the concerns except for the money side and I already have the TDI.
Since the 2A was available with a diesel, I'm not sure if that approach (non-turbo 200 DI) changes the character, but I welcome your thoughts.

Clark
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