As written in my sig, I have a 2.47 diff in my car, in preparation for the gasser engine. Yes, it is a dog (with the diesel, anyway)! However, I only did it to make gears 1-4 act more like 2-5 and get lower revs on the freeway and a quieter ride. So if I could fit a 5-speed I'd probably go back to something shorter like the stock 3.07.

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'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo