no 2 wheel high

[hairj]

1977 dana 20, 95000 miles. Duff's J-shifter. 4w lo, neutral, 4w hi all shift and work fine. Shifts to 2w high but nothing. At 77 years young I am hoping for a simple fix. J-shifter, or linkage at tc. ( I know wishful thinking ) Is there a simple explanation inside the tc that would cause this? Also can I do further damage to the tc by running in 4w hi with hubs out? This bronco is a street only. Thanks

 

[Viperwolf1]

Has the transfer case been separated from the 3 speed adapter since this problem first started? If so, the transfer case input gear could be installed backwards. There are dogs on one side of the gear that mesh with a sliding gear inside the tcase. If the gear is backwards, no meshing can happen. It's a fairly easy fix. The hardest part is the tcase needs to be separated from the 3 speed adapter. The offending gear will be at the rear of the adapter retained with the world's toughest snap ring. It's a common mistake.

 

[hairj]

Has the transfer case been separated from the 3 speed adapter since this problem first started? If so, the transfer case input gear could be installed backwards. There are dogs on one side of the gear that mesh with a sliding gear inside the tcase. If the gear is backwards, no meshing can happen. It's a fairly easy fix. The hardest part is the tcase needs to be separated from the 3 speed adapter. The offending gear will be at the rear of the adapter retained with the world's toughest snap ring. It's a common mistake.

Transfer case has always worked and never been separated from the adaptor. Only issue I can think of ( doesn't get driven often ) is when shifting out of 4wd to 2wd. Shifts hard sometimes and I must go forward and reverse to get it to shift. That is why I was hoping maybe a linkage issue? Is there a reason the tc failed? Shifting fork, set screw, detent ball ? If it will do no damage now is the time of year I will be driving it. Thanks for your help.

 

[serial car restorer]

Does it drive OK in 4H with hubs unlocked? If it does, then rear output is spinning and that would make me think the t-case internals are OK and something in the linkage is not correct. But I'm not familiar with J-shift at all, so can't go any farther w/o looking at one.

 

[hairj]

Does it drive OK in 4H with hubs unlocked? If it does, then rear output is spinning and that would make me think the t-case internals are OK and something in the linkage is not correct. But I'm not familiar with J-shift at all, so can't go any farther w/o looking at one.

Yes, it drives fine in 4H with hubs unlocked. I have sent an e-mail to Duffs asking about the J-shifter linkage. Thanks for your input, I am hoping for a linkage issue!