Thinking about dual trans

[Urban Wheeler]

twin t-90's behind the 152. I already have an extra t-90 with d-18 attached, and a number of d-20s in my shed.

I haven't gotten all the way through this thread yet, but it seems to be the best one I've found. (and that wasn't much) http://www.pirate4x4.com/forum/showthread.php?t=132841&highlight=dual+trans%2A


Thoughts?

[Chief yelling alot]

anything lower then a wide ratio tranny with a 4:1 x-case and low gears eg 4.88 is unnessary IMHO

but it sounds like cool project

[Afireinside]

I have been THINKING about this for a while,I saw a writeup somewhere and cant remember where:rolleyes: about putting two 465's together.I was thinking about trying it with an auto followed by a four speed(T-19or465)but without a clutch I can't mentally think how you would shift the four speed without stoping or going to neutral.Keep us posted on what you find.

[IHWillys]

My initial thought is to the second position T90 and the torque input to it. Seems like a lot to ask of a little ole T90.

Ken

[LewMan]

i tried for a while to mate a "brownie box" 2 1/2 ton aux. tran. to a np205; the box/205 would be divorced from the trans driving it. decided it would cost a fortune in machine fees to do, but yes, it would be way cool! good luck!

[tyme_gypsy]

but without a clutch I can't mentally think how you would shift the four speed without stoping or going to neutral.Keep us posted on what you find.

I ran a paystar 5000 with a 6 speed allison (auto) a 2 speed transfer case and a 4 spd. brownie. (add up the gears...yep! 48 forward, 8 back).You should be able to drive a stick without using the clutch by RPM matching but if you can't you can slap the auto into neutral and catch the shift on the secondary trans then shift the auto back into gear. Most big rig drivers don't use the clutch except on starts and quick shifts because of hills (try that with 52 gears to choose from: 13 spd w/4 spd brownie). To shift the aux. box at a stop you need to shift the auto from drive to reverse then to neutral to make the shift. Typically you'd select a RANGE in the brownie/secondary trans and do your shifting with you main trans, like you do with a TC. High range for on road, low for off. 3rd under for onroad, heavy load, etc.
box/205 would be divorced from the trans driving it. decided it would cost a fortune in machine fees to do, but yes, it would be way cool! good luck
IF you find a 201 from a 60's to early 70's D/W300-D/W500 Dodge (& some W200's) , you'd find that they use the yokes that take the big Dayton u-joints, like 2.5 ton size. Same with motorhome applications. With those you should be able to plug them right into a torqueflite, any early NP trans and the 200/201/early 205 TC's and most likely your brownie as well. From what I have seen the earlyDAna 60 and 70 axles/TC's and torqueflites and stick trannies all share the same spline. I have used IH 205 parts and f**d parts in an old 201 and everything went right in.
Two T-90's would be problematic as you would be feeding huge amounts of torque to the back one. If the 152 is putting out 200FP's and the trans has a (hypothetical) 4.5 to 1 low, you're stuffing 900FP's of torque into that poor little back little trans and I don't think it would survive.

[Rusty Escandell]

I ran a paystar 5000 with a 6 speed allison (auto) a 2 speed transfer case and a 4 spd. brownie.

Great idea, only I can't find ennough info on these Brown-lipe (Brownie) aux. trans. Any idea where I might find more info, like pics, ratios, size and weights?

Thanks
Rusty

[Urban Wheeler]

Most big rig drivers don't use the clutch except on starts and quick shifts because of hills It was rare for me to slip shift other than start/stop and backing up. I have tried to slip shift smaller vehicles, but the smaller engines and trannies lose rpm too fast to make an easy shift. Besides, with synchros, there is really no need.
Two T-90's would be problematic as you would be feeding huge amounts of torque to the back one. If the 152 is putting out 200FP's and the trans has a (hypothetical) 4.5 to 1 low, you're stuffing 900FP's of torque into that poor little back little trans and I don't think it would survive.
That is about an 80 hp motor, so I don't think there is more than 120 ft/lbs (Can't get on BB for some reason, wonder why :rolleyes:) and I know first is 3.4-1, so that is 408 ft/lbs, times another 3.4 is 1387 to the d-18, gets you 3248 and a half, axle ratio of 5.89, 19116.4 to the wheels, that is sure to break some axles! OTOH, 3.4 x 3.4 x 2.34 x 5.89 = 159.32 crawl.


Anyway, that for your input.

[LewMan]

[QUOTE=Rusty Escandell]Great idea, only I can't find ennough info on these Brown-lipe (Brownie) aux. trans. Any idea where I might find more info, like pics, ratios, size and weights?

I spent a lot of time trying to research Brownie boxes--very difficult. found myself on many post sites which was way cool, but some you had to join (cash) to participate. I never did get an exact ID...too funny, mine had the alum. tag on it but no # of any kind- not worn off but never even stamped by the factory!