a input shaft for an SM465 that instead of being splined on the outside, hade a driveshaft style yoke???

this would allow divorced mounting of an SM465 and a NP205 or whatever transfer case behind a 2WD transmission.

therefore, you would use the 465 as a 4 speed underdrive, and your first gearbox as the primary.

you could run two manual transmissions, or an auto then a manual.

with an NP205, this setup would give you these options as a transfer case low range-

14:1, 7:1, 3.4:1, or 2:1, versus a doubler at 2:1 or 4:1 only

the forst transmission and 2nd transmission would mount via a very short driveshaft (1-2" long)

i do not have any idea on price yet, but i would assume that for a new input shaft and a short driveshaft it would be under $1000 (probably well under).

you would need to supply the first 2WD transmission and the SM465/205 combo.

what do you all think?

interesting:smokin:

I like the idea. I wouldn't buy one npw at least because it wouldn't fit my truck. But what I wanna know is, how are you gonna make a driveshaft that is 1-2 inches long? You need at least that much spline contact plus the joints and yokes themselves are about 2.5 inches long. That seems to be the big drawback, unless you have an idea that I am not aware of. LAter!

Originally posted by Blair
I like the idea. I wouldn't buy one npw at least because it wouldn't fit my truck. But what I wanna know is, how are you gonna make a driveshaft that is 1-2 inches long? You need at least that much spline contact plus the joints and yokes themselves are about 2.5 inches long. That seems to be the big drawback, unless you have an idea that I am not aware of. LAter!

it doesnt need splines cuz both units will be mounted to the frame. it only needs u joints because of the deflection in the poly mounts under torque. :D

Would be cool in a long wheelbase rig.

Do some more research, I would definatley be interested.

How about simply cutting the Throwout bearing sleeve off the input retainer.

Then have the input shaft cut down, resplined and threaded.

Have Jess make an internally splined 1350 flange. Driveshaft? why not just bolt the 1350 yoke to yoke? make a nice beefy combo mount, for both tranny's and DONE! Would be nice.

technically you would only need 1 u-joint, and 2 yokes, why have a "shaft"? But i do think this would be strictly for fullsize guys or minitruck guys. Hard to fit this in a jeep or cruiser. Maybe if i moved my rear end back 6" or so, say coil-overs???

why not a single u-joint? because that would mean no translation allowed between the two transmissions on their poly mounts. Any attemput to torque over differently would put lateral loads on the in/outputs of the two trannies. If you used instead the "H" part of a double cardan joint (the cv at the top of of those shafts), that would introduce a translational degree of freedom, so you'd only need to worry about thrust, which should be no problem. The H part of those is only a few inches long....maybe that's what he was thinking?

sean

Are the input and output splines on the manuals the same (thinking 10 spline)? If so, couldn't you just cut the shafts down a tad, and use a factory coupler with a custom adapter plate? I think Advance sells 10 spline output shafts for mating auto trannys to t-cases that originally came with manuals.

As for the driveshaft, I agree, just use 1 joint. If you want splines, use a 2wd trans w/a slip yoke.

Pete

Sounds cool as hell, but would be one LLLOOONNNGGG sum bitch.

Depdog:D

I know someone building a rig with 2 465s and then a 205, he would probably be interested as he has yet to have someone make the adapter...

I have been working the idea around for a little. Get a stock 4x4, 456 with the correct bellhousing to whatever engine yu are running, Get another 4x4 456 conected to a np205 I dont know what the output shaft spline count is or the input spline count. Get a sleeve machined to match the input splines on one side and the output splines on the other. Get another adapter machined with the bolt patterns from the back of the 456 one one side and the front of the other 456. You could make your own using two bellhousings cut and welded together, just drill out the one to match the bolt patterns on the back of the 456, with some extra bracing welded on for extra strength. You need a whole bunch of crossmembers but i think my idea would be killer for gearing and really trick. If anyone has any ideas to inprowe this please let me know. I plan on diong this this summer so i will let everybody know how it turns out. :usa:

A neat idea but would only be really usable in Big trucks, smaller vehicles wouldnt need or couldnt fit that much heavy equipment. I guess if some one wants it you may sell a few but it is definatly a VERY specialized market.

the only problem I see with that is the input shaft is supposed to be held straight by the pilot bushing in the back of the engine, its not designed to be self supporting, I think you would get some input gear deflection with the setup you are looking at, especially when the front tranny is in low. I'm planning to run dual trannys but I'm going to build a coupler for the output to input shafts, drill the forward shaft to pilot the rear input shaft and build a solid mated adapter. shouldn't be tooo much longer than a doubler, I'll just set the engine forwards to compensate for the extra length.

Originally posted by NE-RokToy
A neat idea but would only be really usable in Big trucks, smaller vehicles wouldnt need or couldnt fit that much heavy equipment. I guess if some one wants it you may sell a few but it is definatly a VERY specialized market.

all this fits in a Willys'.....and considering how completly screwed the old tranny's were...... there is probably a "need" for them
it's a 420 mated to a T19

:D
http://www.sierrarockcrawlers.com/data/srcforumuploads/Dual_tranny_95OTT.JPG

:eek:

Originally posted by mytzlflick
the only problem I see with that is the input shaft is supposed to be held straight by the pilot bushing in the back of the engine, its not designed to be self supporting, I think you would get some input gear deflection with the setup you are looking at, especially when the front tranny is in low. I'm planning to run dual trannys but I'm going to build a coupler for the output to input shafts, drill the forward shaft to pilot the rear input shaft and build a solid mated adapter. shouldn't be tooo much longer than a doubler, I'll just set the engine forwards to compensate for the extra length.

This is almost EXACTLY what I've been kicking around. Only diff is I would put an auto (TH400) in front of a 465. I have a K30 (soon to be 110" wb) and even I wouldn't want the extra length of the stub shaft between the 2 tranys. I was talking to Marv Springer a few days ago about making a new larger input shaft for the 465 that had the female 32 spline input like the TH400 NP205s. Of course, that would require a new front plate with larger seal to allow it to slide over the larger input shaft. It would also locate the input shaft and adapt it to the back of the TH400 with only a (roughly) 3-4" adapter (about the same as short TH400-NP205 adapter. Then make a short 32 spline output haft (cut down and respline) with a short adapter going into the TH400 version 205. I do not want to use the stock 465/205 setup because it is too long and only has 16 spline shafts.