I've posted this request before with no response. I'll give it another try. I have been unhappy with my turbo 400 in my 66 GTO. That is to say, the transmission performs well with one needed feature. I really want and need an overdrive that is to say a fourth gear. Now I know some of you will say why don't you just put in an overdrive transmission, I believe 2004R is the one for the Pontiac. I thought about that and the cost of having one built for me and installed at the transmission shop is somewhere around $4000 . I cannot do the install myself from my home. I've also considered purchasing 2004R transmission from bowtie overdrive in Southern California. The cost is reasonable at around $2400. But again I have no way to install it and transmission shops i've talk to shy away from installing other companies products. So, I have decided and then going forward and purchased the gear vendors overdrive. $2800 ..... I believe the instructions are clear and I can install this at my home with little difficulty. So my question is : Has anyone installed gear vendors in your GTO and are you happy with the performance? Thanks in advance for any response to this post.