A 16 spline xtra-long T-Case input gear that drops right in (1 Viewer)

[lcwizard]

I'm seeing Mcnamara's as being for the 5 speed with a note to contract them about a similar gear for a 4 speed. I just may do that to see what they have up their sleeve. This only because it interests me. The armchair (ok, hillbilly) engineer in me still says that adding even 2" of spline behind the input gear does not add as much strength and support as filling that 5/8" void below the machined oil seal surface with 5/8" worth of splines. Talk about beating a dead horse..... SO, Let's say I pull the trigger on installing my split case. I have searched the parking brake issue quite exhaustively over the years and I'm not going to source expensive factory unicorn parts. I will deal with that in my own manner. But, will the split case/4 speed from the '84 60 bolt in and work with my existing FJ55 drive shafts? I adapted honda rotors with willwood mechanical calipers to my '85 Case skidsteer many years ago and this setup holds the 6000 lb hydrostatic machine anywhere I park it on my mountainside property which is steeper than the proverbial 'cow's face'. Parking brake work, if I go this route would be covered in a seperate thread. So split case works with existing drivelines? Thanks

The u-joints on the late 40s and 60 series are the same. There are a couple flange patterns on split cases so worst case is swap a flange at the t-case

 

[island45]

The u-joints on the late 40s and 60 series are the same. There are a couple flange patterns on split cases so worst case is swap a flange at the t-case

My pig donor chassis is a '79 and I recall it has the big flanges with big bolts all around. Yay!

 

[Living in the Past]

A pto gear machined and welded to an input gear still cantilevers the gear, leaving it hovering over the worn area. The gear that straddles the worn area is supported evenly on two sides. Perhaps there is no demand because it doesn't exist, but I know nothing about marketing so I'll leave it be.

If the spline is not worn to a point and still has flat area on the outer section a new input running inner flat area it shouldn't cantilever.

I’ll add my 2 cents, I’ve just not seen the demand over the years. We sell a good number of the 19 spline long gear setups for the split t-case, and a fair number of the (4) different 10 & 16 spline gears we sell. But I can’t think of too many inquires on a long spline 10 or 16 spline input over the decades.

I have three of the four gears you sell loose. Assume the fourth is ten spline thirty one teeth gear used on the later three speed after 4/75?

I seriously doubt you would have any demand for the ten spline gear since those do not wear like sixteen spline shafts. They usually snap first.
Sixteen spline well known for spline where. Unlike ten spline PTO gears that were in all three speeds with this transfer case the sixteen mainly had a spacer instead of a PTO in the US market. But I do see a judge advantage welding the two gears together. The PTO is thicker and unlike the input gear it fully splined. Input gear is not only not splined where it goes thru the front where the seal is it overall thinner. The PTO gear is fully splined. So instead of twice the spline area it's more likely closer to three times the spline area. I haven't actually measured that.

 

[cruiseroutfit]

I have three of the four gears you sell loose. Assume the fourth is ten spline thirty one teeth gear used on the later three speed after 4/75?

We stock a 10-Spline in 29 & 31 tooth as well as a 16-spline in 29 & 31 tooth

 

[island45]

All good points, Living in the Past. My '79 t-case I rebuilt last winter had splines that showed 50% flats remaining. In the end I bought Kurt's 16 spline oem style gear and installed it on the partially worn shaft. This elimated half the play in that area and I decided that was good enough considering my age, the around town usage, the yearly accrued mileage and the fact that my grandkids still have a blast riding in the old jalopy whether the case growls a bit or not. Other than that worn shaft, I replaced all the tcase bearings and seals and half of the shafts and gears. I opted out of tearing down the H2 or spending 500 bucks on a one-off gear. But just think how long my imagined 2 3/8" long fully splined and centered input gear would last on a new transmission shaft.

 

[island45]