Rebuilt Dana 18 shift problem

[Robert1324]

I recently made my maiden voyage in my 1961 Scout 80 after rebuilding the T-90-A1 transmission and Dana 18 transfer case with a twin stick. This is my first build, but all seemed to go well with help from Rick Stivers videos, Schnitzelhaus videos, and great guides from Novak. Thanks to all. However, I have a problem with not being able to shift the rear axle into LO. It will shift to neutral and HI only, no LO. Front axle shifts to all positions.

I removed the poppet balls and springs from both shift fork shafts and it made no difference. I have removed the inspection cover and everything I can see seems to look ok. My suspicion is drawn to the output clutch shaft but I don't understand what could be wrong there, unless my tie wire broke and is causing a jam. I did reinstall the shift interlock when assembling. The shafts, poppet balls and springs were in good condition. I am hoping to find the problem before I decide to pull the front bearing cap. Is it possible to install the interlock incorrectly? I could find no information that the shafts needed to be in any certain position when installing.

Thanks for this Forum. Any help appreciated.

 

[Robert1324]

This is an update to my post which got no takers. I think that I may have figured out the answer to the problem that may not have existed. When I ordered the parts for my rebuild, I also purchased a decal that showed the shift pattern for my Scout 80. I believe that I received a pattern for a Dana 20 instead of Dana 18. Can someone confirm this please? As I can figure it, the output clutch shaft gear is either engaged or not engaged and there is no HI or LO. Ignorance is not bliss.

 

[1975IH200]

The Dana-18 transfer case shift decal is attached below.

The left lever (taller one) shifts the front axle In and Out of gear.

The right shift lever (short one) shifts the range from Low-Neutral-Hgh.

Dana-18 shift options are:
2WD HI,
4WD HI,
4WD LO,
Neutral.

 

[Robert1324]

Thank you for the confirmation. Robert