Qwik Stik Tremec T56 Front Shift Conversion Kits??

[Winmon]

I bought one to use on my '06 GTO pullout T56 and we could not get it to shift correctly once installed. Ended just buying a new T56 Magnum instead and sold off the GTO T56. I ask because I paid $400 for it and would like to sell it, HOWEVER, I do not feel right selling if it is going to pass the problem onto the new buyer.

http://www.ebay.com/itm/TREMEC-T-56-6-SPEED-MID-SHIFT-CONVERSION-SHIFTER-/110934313583?hash=item19d4334a6f

http://i994.photobucket.com/albums/af65/Winmon1/Misc/Bel%20Air%20Parts%20010_zpsqc1djwqz.jpg