A T56 from a '98-02 Camaro or Firebird, or a GTO, (and maybe CTS-V but I don't recall for sure) are your bolt in options.The T56 from the earlier camaro's with the LT1's have the wrong input shaft. The Corvette transmissions don't work either, they are set up with a torque tube. There is at least one Z on here runnig that torque tube set up, see Phantoms build or car. Some people are also fitting the TR6060, look for Crapforum's build.
There is also an option of fitting a tranny from a 350z to an LSx motor, but it involves buying an afttermarket bellhousing and cutting off the original bellhousing. Someone is working on this, but I havent seen an update from them in a while. Use the search and you shoud be able to find it.
The LS1 T56 is a hard to find item, which are getting harder to find and more expensive. They cost more than a complete LS1 in many cases. Keep an eye on LS1tech classifieds and they pop up for $1500-1800.
Search is your friend, there in no shortage of answers on this forum. most questions ahve been asked and aswered. Finding the right search terms can be the difference between success and frustration.
Edited by JoeK, 28 October 2015 - 09:51 AM.
1971 240Z - LS1 swap in progress. Just need to: get wheels, drop the car from the rotiserrie, install the motor and trans, rebuild my dash, put in a new interior plus a few more odds and ends (about $10k in incidentals). Should be on the road before my 5 year old heads off to college.