[Cal Metal]

Frankym:

If this is a non Super T-10 Warner and the old style T-10, unfortunately, the transmission is probably not going to take the punishment from a FE block over the long pull. Chevrolet dropped the T-10 in mid '63 EVEN before they introduced the Big Block series. Ford dumped it in '64 and never used it thereafter in their FE motors. The long term problems with the T-10 that most people experience is that it will eventiually grind going into second and will pop out of third gear on deceleration. They worked well in the Cobras with the SB in road racing application, but as a straight line transmission they are not very sturdy. The Muncie, which replaced it in GM performance cars, is nothing more than the T-10 with bigger gears, synchros, etc. The T-10 is probably on a par with the Tremec T-5. An OK transmission but has limits when hooked up with a big engine.

Regarding the problem at hand, if linkage/shifter can be ruled out, look at the 2nd gear synchro assembly. Sometimes the inserts (I call them dogs) that are contained around the synchro hub (there are three of them) can break (it is ususally just one that will) which will hinder shifting and can cause a grind since the hub is now cocked to one side.