twin stick a 66 T case

[Passauf]

What does it actually take (internal and external ) to twin stick a 66 "T" transfer case thx

 

[Terkish]

I belive on the "T" shift style transfercase thier isn't any internal modification needed.
Just remove the stock shifter and the link between the shift rails and install the twin stick. The floor shifter hole will have to be modified a little bit to let the twin stick come through and work properly.
Only the "J" shift style needs slight modification for a twin stick.

If i'm wrong i'n sure some one else will chime in.

 

[Viperwolf1]

I belive on the "T" shift style transfercase thier isn't any internal modification needed.
Just remove the stock shifter and the link between the shift rails and install the twin stick. The floor shifter hole will have to be modified a little bit to let the twin stick come through and work properly.
Only the "J" shift style needs slight modification for a twin stick.

If i'm wrong i'n sure some one else will chime in.

On the T-style case it depends on how you want it to shift. The T uses internal interlock rods to prevent the front shift rail from moving into a range until the rear shift rail is already in that range. If you twinstick a T without removing these interlock rods you will have to shift in sequence. Rear range first then front range. When coming out of 4wd you'll need to shift front range to neutral before you can change the rear range. I would hate this as it complicates shifting and doesn't give you any advantage over the original shifter.

Remove the interlock rods and you have complete independant control of both front and rear ranges. This also gives you the ability to drive the front axle only if you need to.

The J-shift case doesn't have the same interlock scheme as the T. It uses the flags on the shift rails to accomplish the interlock. Cut the flags so they move independantly and you get the same result as removing the interlock rods in the T.

 

[Dakota]

So is the removal if the interlock rods a big deal? I must have my "J" and "T" backwards. I have a stock 1966 Dana 20, but I thought it was "J." Anyway, how involved is modifying my Tcase to shift all independent?

 

[Viperwolf1]

So is the removal if the interlock rods a big deal? I must have my "J" and "T" backwards. I have a stock 1966 Dana 20, but I thought it was "J." Anyway, how involved is modifying my Tcase to shift all independent?

Not too big of a deal. Just need to disassemble the tcase and put it back together without the interlock rods.

The '66 shifter looks similar to the later J shifter but it has the early T style case.

 

[gddyap]

Excellent write up here by Mark Harris:

http://www.wt4x4.net/tech/twinstick.htm

 

[Pedestrian]

Excellent write up here by Mark Harris:

http://www.wt4x4.net/tech/twinstick.htm

It is a good writeup that explains in detail how to disassemble the case. Do yourself a favor and don't waste your time grinding the shift rails. The front and rear can still be shifted into opposite ranges even with the rail mods.