I was looking at the advertisement on the allpro web page for the new stronger T-case output...


"Over the years we have seen a few output shaft failures in Toyota transfer cases especially when used hard on the trail. All of the failures have been in exactly the same place, right next to the clutch dog in the machined depression behind the teeth, near the center of the shaft. "

http://www.allprooffroad.com/0115s.jpg

This shaft is made from 8620 alloy steel (I believe the stock toyota shafts are also 8620).

This seems to do nothing for those of us who break the shaft more toward the end... (I have broken two like this).

http://image1.villagephotos.com/pubimage.asp?id_=322784

Maybe if you had Toyota power (like the rest of us) and not V8 power, you wouldn't break them.......:flipoff2:

Two questions:

1. Does the 23-spline case have a different OUTPUT than the 21-spline-input style ones?

2. If so, was this 21 or 23 spline?

23 and 21 spline tcases have different input shafts. The 21 spline input shaft is usually the weak spot. With 23 spline tcases the output shaft becomes the typical weak spot.

Sorry I don't have access the Rockwell harness the material.

I ran the following setup when I broke the shafts:

'75 Toyota Land Cruiser
'90 Ford 5.0 H.O. (Mustang)
'74 Ford T-18 2wd 4speed trans

Custom adapter http://www.geocities.com/cwtoyota/projects/50swap/50swapf.html

'87 Toyota Turbo T-case 23spline With '82 shift shafts.

Used to break LC pinions so I went for a V6 Tacoma rear end...
Then I broke T-cases, as in the picture above... after breaking the first one... I replaced the output with a 4cyl part, as far as I know they are the same as turbo.

Before I started building the adapter in the first place, I talked to Marlin to get his opinion (would the Toy case hold up?) he mentioned that 89 and newer shafts were stronger (something with the metallurgy)... and for even more strenght you could polish that "Weak Spot" to remove stress risers... I didn't try either of those fixes...

finally I gave up on the cruiser and traded the frame and body to a friend...

I am planning to build a crawler setup for one of my other Toyotas, it still has a 22R and I might want one of these shafts...