Well the Transmission in my 93 mark viii took a crap so I proceeded to purchase a 2002 mustang gt trans. Performed a mild j-mod, but didnt take the springs out of the accumultors. Put it in repinned the connector for the first few miles the trans would work good in 1st and 2nd but when it would go to 3rd it would act like it didnt know what gear to go to and would rev up like it was in neutral. Driving it some more it ended up having a hard time finding first and 2nd and would require you to rev the engine when putting it in gear to get it to do anything. Reverse works fine though. Any ideas on what the problem is?