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rotorwrench · 12-23-2019, 02:34 PM

If the shift tower is off the case, you should be able to move the synchro and get 2nd & high back into neutral. If it's locked in 1:1 drive (high gear) then it locks the input gear to the main shaft which will try to turn the driveshaft. It will also lock the cluster since it's mated at the input drive gear at all times. In low and second gear the cluster is mated either with 2nd or the low/reverse gear and they should be able to slide unless there is a load from the drive shaft as was mentioned earlier. If you get the synchro and low/reverse gear in neutral, it should turn unless the clutch is engaged. If it's all in neutral and it still won't turn, there is a problem in the bearings or fit somewhere.

It's not as easy to work the transmission without the shifter top when the trans is in the car but it should be movable if loads from clutch and rear axle are removed. It always takes a bit of motion to get the stuff to slide more easily. Either shift tower should work as long as it has the early type synchro. If it has the late type synchro, only the vertical towers will work with the 91A type 2nd/High fork installed. The forks can be modified but it takes cutting and welding to get one that will work on the old style angled tower.

12-23-2019, 02:34 PM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Transmission is locked up If the shift tower is off the case, you should be able to move the synchro and get 2nd & high back into neutral. If it's locked in 1:1 drive (high gear) then it locks the input gear to the main shaft which will try to turn the driveshaft. It will also lock the cluster since it's mated at the input drive gear at all times. In low and second gear the cluster is mated either with 2nd or the low/reverse gear and they should be able to slide unless there is a load from the drive shaft as was mentioned earlier. If you get the synchro and low/reverse gear in neutral, it should turn unless the clutch is engaged. If it's all in neutral and it still won't turn, there is a problem in the bearings or fit somewhere. It's not as easy to work the transmission without the shifter top when the trans is in the car but it should be movable if loads from clutch and rear axle are removed. It always takes a bit of motion to get the stuff to slide more easily. Either shift tower should work as long as it has the early type synchro. If it has the late type synchro, only the vertical towers will work with the 91A type 2nd/High fork installed. The forks can be modified but it takes cutting and welding to get one that will work on the old style angled tower.