From the looks of the dogs on your 4th gear you need to replace the input shaft for sure.
Maybe get it all disassembled and cleaned and post the pics of the dog teeth on all the gears. Follow the service manual to disassemble and you will be fine. By the way do all the gears look good on the counter shaft cluster?
Maybe get it all disassembled and cleaned and post the pics of the dog teeth on all the gears. Follow the service manual to disassemble and you will be fine. By the way do all the gears look good on the counter shaft cluster?