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8-10 hours is about right for a transmission swap, if they are going by book time. That may go up if they have to fight anything or other things go wrong along the way(very likely)
My mechanic just quoted me $2,000 for the installation, I am going to get another quote as well.
I can attest to the durability and reliability of the ZF Transmissions used in Discovery 2 models. My unit has 230,000k on her and when I first bought the truck afew years ago a intercooler line popped off and drained all the fluid while I was on the highway... was able to get off the road, secure the intercooler line and had just a quart of fresh tranny fluid at my disposal so I added the quart and drove 2 hours to get back home. The tranny was running real rough and I could not exceed 25 mph. RPMs high etc. When I got home I replaced the filter and flushed the tranny twice and it was fine for 1.5 years. Recently a critical but small seal failed inside the transmission which requires the removal of the tranny in order to replace the seal. SO I decided it would be worth having the entire unit rebuilt, cleaned up and put back in my truck. I played $2,385 for the rebuild. The shop I went to specializes in Transmissions. So use my numbers as a reference.
Awe I see. In my original post I mistakenly used the term "intercooler". What I ment to say is "transmission oil cooler lines". And more to the point; I misinterpreted your response as suggesting that the transmission oil cooler has nothing to do with the transmission. That is why I jumped on your post. But I was wrong and used the wrong terminology so my apologies.