pre-96 R150/R151 input shaft swap into 1996+ R151F? vs W56-bell-R150 adapter?

[Chuck78]

Is it at all feasible to swap the 85-95 shorter input shaft from an R151F into a 1996+ R151F? Or 96-04 R150F.


I have a 2009 70-Series Land Cruiser's R151F trans and transfer case with the longer input shaft, and am wanting to use a Doomsday Diesel 22R to VW TDI adapter as they clock the TDI over 20 degrees to the passenger side,a HUGE plus trying to fit the tall ALH into a Suzuki/VW/Toyota Samurai build. this moves the oil pan over to the driver's side significantly since it clocks at along the crank axis, and also reduces the overall installation height 2 inches, so you get significantly better Samurai hood clearance or mounting height away from the front diff/high steer. This is also very much preferred for a Toyota solid-axle swap or 79 - 85 Toyota pickup. The ALH does not fit in very well mounted near vertical in those solid-axle front-end applications, but it does fit significantly better when clocked over 20 degrees (valve cover towards passenger side fender, like the native VW installations are typically clocked in VW transverse applications, 12 degrees up to 20 degrees depending on model.

I have two R151F 22RTEC bellhousings.
I have the 1996+  long input shaft trans.

I was slightly concerned about mixing & matching gears from different trannies due to different wear patterns.
I have read that the helix angles on the gears changed at some point, but this may only pertain to the AX15 Jeep version of the R-series trannies, which was 1994 or perhaps 1992 changeover.

I can't swap the entire guts from the 86-87 22RTEC turbo R151F, as I have late model R452 5th gears to swap into the 1996+ R151F, but I should have an entire set of internals from a 86-87 R151F turbo trans on Monday. The 5th gear overdrive upgrade parts that I have do not work on the early transmission internals, however. So in order to keep those for my .695:1 overdrive swap, I have to use the shafts of the 1996+ R-series

 

[Chuck78]

So I do have 2 other options,

Advance Adapters makes a 15mm thick $475 adapter to bolt a W56 bell to an 86-95  R150/R151 trans, with a custom extended pilot bushing that hangs out of the crankshaft a ways since the adapter makes the input shaft no longer long enough. This compensates a bit for the extra 25mm length of the 96+ input shaft...
I'm not certain exactly where the input shaft will be with a 3/8" thick engine to bellhousing adapter and the VW engine in place of the Toyota, but this might give me pretty close in length to using the longer input shaft.

Also I can use a much more expensive 18.5 degree maximum clockable adapter from TD Conversions/Northwest FabWorks for the 1996+ 3.4L 5VZ V6 bell, but it is 2" thick vs 3/8" thick, costs more, and uses an aluminum crank hub adapter that doesn't take the stock flywheel bolt torque specs. In a Samurai, an extra 1-5/8" or 2-5/8" drivetrain length is pushing it, although I do fully plan to stretch the Samurai frame to SJ413W LWB body length or SJ413K pickup bed (same frame length & wheelbase, 93" vs 79.9").


The longer input shaft for 1996+ transmissions is still available as it is used at least up to 2018 or 2019 Land Cruisers. The 86-95 short input shaft is a used-only item, NLA from Toyota.

My other option would be to machine a 1-inch spacer (give or take some thickness) to push the bell housing off of the adapter slightly, and use extended dowels, or also I could use this 1HZ Toyota diesel engine bellhousing and mill down the transmission side into a spacer about 17 mm thick... That will change the geometry of the clutch fork slightly if I put it on the transmission end, however. But the Advance Adapters kit does the same.


Thoughts?

Obviously the easiest would be to go with the V6 bellhousing and the TD Conversions clockable two piece adapter kit and crank hub adapter, but the Doomsday 20-degree clocked 22R adapter is pretty ideal. Their 3VZ R150 to VW TDI adapter is only clocked 15 degrees, and I don't want to have to clock the transmission and transfer case 5? or even 3.5 degrees due to a very narrow transmission tunnel in a Samurai which will already need widened, I can't move the seats outboard any further!

 

[Chuck78]

So the R-series transmission input shaft gear & corresponding main cluster input gear helix angles apparently changed in March of 1994 so I am seeing from the Toyota parts listings on MegaZip.net and to a lesser extent ToyoDIY.com reference site and PartSouq.com.  So the March 1994 - November 1995 short version input shafts and the 1996+ longer input shafts on Tacomas/4Runners/etc will swap with those main cluster shaft transmissions, but not the Feb '94 & older.  Marlin mentioned just the input gear helix angle changing, not ALL gear helix angles, so perhaps just installing the revised 1pc geared cluster shaft and input shaft are all that is needed to swap the older transmissions?  The older trannies short input shaft is NLA, obsolete...  so I am assuming this is the case, would be surprised if Toyota totally left the owners of 85-93 R series transmissions just hanging...

So the short input shaft with the revised helix angle gear is still available, and there have been 4 or 5 versions of it since then even...  the 1KZ diesel powered Hilux trucks and Land Cruisers used these post-1996 as well, and even the 2016+ 4cyl Tacoma etc manual transmission uses this same shaft that fits a 1995 R150F.  33301-26060 is the part #, look up a '95 on MegaZip.net