Check out this company.
CKPerformance.com
i have not used them but i have read on different fourms that these are great trannys, they have no core charge, you get another complete ready to drop in tranny for the price. they have all the build specs on their website
seems like a good deal to me.
STAGE 1 4L60E/4L65E TRANSMISSION
The stage 1 4L60E/4L65E is built for engines producing up to 500 foot pounds of torque. $1899
STAGE 2 4L60E/4L65E TRANSMISSION
The stage 2 4L60E/4L65E is built for engines producing up to 700 foot pounds of torque. $2699
http://www.ckperformance.com/resourc...SMISSIONS.html