Screwball auxiliary trans idea of the day.

[RLDSL]

I went a little bonzo and started calculating gear ratios and , providing my math isn't total garbage, here's what I came up with for a couple of the units using 4.10 and 3.55 rear ends. The three sped unit gives a nice OD, but not any real useful gears in between on the top end, the 4 speed unit lends itself to quite a few useful combinations. This was obviously only 2 boxes i figured up, there's a lot of other possibilities, but I'm leaning heavily toward the 8341 in that configuration .if I can find one. The 3 speed with a '85 od might give a better split than the .73, but it's 3am and I'm pooped

5831 &3.55
OD .73 Direct Under 2.0
5th 1.74 2.7 9.8
4th 2.59 3.55 10.65
3rd 4.08 5.04 12.14
2nd 7.46 8.41 15.51
1st 13.74 14.7 21.8


5831 & 4.1
OD .73 Direct Under 2.0
5th 2.01 3.12 11.32
4th 2.99 4.1 12.3
3rd 4.72 5.82 14.02
2nd 8.61 9.72 17.92
1st 15.87 16.97 25.17


8341& 4.1
OD .813 Direct Under 1.22 Low 2.40
5th 2.35 3.12 8.12 12.96
4th 3.33 4.1 9.1 13.94
3rd 5.06 5.82 10.82 15.66
2nd 8.96 9.72 14.72 19.56
1st 16.21 16.97 21.98 26.81


8341& 3.55
OD .813 Direct Under 1.22 Low 2.40
5th 2.03 2.7 7.03 11.22
4th 2.89 3.55 7.88 12.07
3rd 4.38 5.04 9.37 13.56
2nd 7.75 8.41 12.74 16.93
1st 14.03 14.7 19.03 23.22

 

[ttman4]

And we do know we'll lose hp to wheels everytime we add gears/transmissions, don't we?
I'm always finding really good info somewhere on the Net, save/file/bookmark it, then can't find it...can't remember what I filed it under....can't remember if I did save it,....or even suddenly run up on it saved under some stupid heading & wonder "what's this, where it come from, I never saw this....,or did I...?"

But anyway, I saw somewhere other day that they calculated about 20-30 horses for one of these man. aux. 3-4 speed units.

Little bit here, little bit there....Horses lost from fan, AC, alternator, low tires, heavy gearbox fluids,......
On semis we used to figure about 25% lost from flywheel to ground 1st axle, then another 10-15% to 2nd axle.

But I don't care, I want one. Way I figure it, I can still go fast enough to be first one there, fast enough to get tickets, fast enough to pass ****** POWERED HAIRY GOATS!!!

my next project is invent a goat hair wiper to wipe goat hair from my radiator!!!

 

[ttman4]

Well you guys may already runned up on this site, Cohen & Sons but it kinda shows some of prices they want for some of these units in today's market.
Another interesting tid-bit I ran up on at the TTC site under Gen Lit. Model & Part Numbering System, # T240-2 under "Old Numbering System" the Transmissions are rated in Ft# torque....ie; #6052B is rated 600FT#, # 1420-3B is 1400ft#.
However, the Aux. tran. are rated for the transmission they're compatible with...ie: a 8341 aux would be compatible with an 830ft# torque transmission, 7041=....700ft# tran., 5831=580ft#, etc, etc.
At least that's way I interperate this literature.

Are there any Driveline/Ujoint Gru-rues here on OB?
I not so smart when it comes to angles & dangles etc....I do know if they ain't right, they will spit out with a BIG BANG!

You guys figured out yet about what some of these units you looking at may weigh? I got feeling that they'll weigh 3-400# mounted, depending.
I don't remember what a ZF5 weighs????

 

[RLDSL]

I gust got a neat envelope in the mail today. I got a couple of old spicer brochures off ebay. some handy stuff in there
Where you have a tranny that ends in a 1 it is an iron case, and if it ends in a 5 it's an aluminum case. ( i.e. 8341= iron, 8345= Aluminum ) That explains why they have all those with the two number configurations

As far as size and weight, here's what I got on these things:

Auxiliary Transmission Model Length, flange to flange Approx weight
Iron Aluminum
5831 3 speed 18 13/32” 155
6041 4 speed 23” 250
7041 4 speed 25 3/16” 340
7231 3 speed 23” 230
8031 3 speed 27 1/16” 425 435
8341 4 speed 27 1/16” 460 380
P8341 4 speed air shift 27 1/16” 473 393
9441 4 speed 32 1/8” 690

------------Robert

 

[RLDSL]

Sorry, I can't get the format to line up on this chart, you'll have to use your imagination to get everything in the correct column .

 

[Pipeliner_86]

I would like to have a short 4-speed like a NP435 to go behind my C-6, then the t-case bolted to the back of the 435. That would give me three gears of underdrive and 4th would be 1:1 just like final in my C-6. With my 35" tires, I don't need overdrive, I need underdrive.

 

[ttman4]

Robert, those #s & wt correspond with the handwritten Scaned Spicer Aux Ratios we found on Web.

I would like to have a short 4-speed like a NP435 to go behind my C-6, then the t-case bolted to the back of the 435. That would give me three gears of underdrive and 4th would be 1:1 just like final in my C-6. With my 35" tires, I don't need overdrive, I need underdrive.

Jeremy, I've thought about pretty well same thing about a 4 speed. Not smart enough to figure out how to do input shaft etc though.
I came thru SaltLake once snooping round for an aux. Got phone # on some guys that supposedly taking 2 older iron cased Ford 4speeds, turn 1 around, do some machine work on 'em, mating them together into 1 unit.....

It was after hours so I was gonna call them day or so later from Or. I called, missed the main guy I needed to talk to, then got busy & lost phone #....

I delivered some stuff once to place in Oklahoma once....couple rich retired guys owning about gizillion acres & just playing in later years.
They had taken some kind of something....no doors, windows, top, just enough fenders to not sling mud.....added 3-4 transmissions, supped up the engine, out there running round ramping & trying to kill themselves. They said they needed it to feed the horses, cows, chickens, run to the store, cops were PO'ed cause they couldn't catch 'em.
I looked it over & at the time I understood how they hooked it all together......

 

[Pipeliner_86]

It wouldn't entail too much crazy fab work, just making an input to spline the shaft. It would be done easiest with a 2wd C6 with a short u-joint shaft to the input shaft on the 4speed. And if the 4speed is a 4x4 trans, there would be a np205 already bolted to the rear.
My C6 is married to my 205, thats where I run into the first snag. I would have to either put a 2wd unit in place or make an adapter to mount in place of the existing t-case. Maybe one of these days when I have money and nothing better to do with my time, I'll build it.

 

[7.3shrk]

Thought about it too - why not take an old clutch disc hub or two, weld them together, and weld them to the splined end of a yoke. Throw a U-joint into that, and then attach the U-joint to what you have coming out of the transmission.

 

[Pipeliner_86]

Thought about it too - why not take an old clutch disc hub or two, weld them together, and weld them to the splined end of a yoke. Throw a U-joint into that, and then attach the U-joint to what you have coming out of the transmission.

Great idea, thats proly the cheapest route. If I ever get the opportunity to do it, I will.

 

[7.3shrk]

In the same boat you are. I have a lot of things I will do.....one of these days.