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If you are going to do the 6 speed conversion, go the 6l90, they are built for the lsa.I hadn't really given it any thought to be honest. The recommendation was to go to a t400 which is an unappealing prospect at this stage as I want to get this car engineered and they wont pass it with a t400.
And I just assumed the difficulty and cost of a later modern trans would be out of my price range.
Been reading a little about it since I seen your post though and seems fairly easily achievable.
This post is a pretty easy one to follow doing a conversion into a vt-vz with a 6l80e
I'll see the transmission guy tomorrow and see what my options are
I have concidered this, it would be cheaper and easier than swapping out the 4l60e for a different automatic transmission, which would probably need a build anywayAnother thought, convert to 6 speed manual?