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Manual 5 speed trans question(twins)?
I have been kicking around the idea for a while of putting a second 5 speed transmission behind the first in this 91 s-10 i got kicking out back.
I want to use tha drive train(4cylinder,5speed,5speed,divorced t-case) in the jeep that I am building.
The concept is this i will esecially have 25 speeds(but obliviousily wont have a need for them all) but i will be able to have some serious crawler gears while having a 0.5 top gear for cruising down the highway.
I plan on leaving the first 5 speed trans stock and then removing the tail shaft, shortening the output shaft, and forging a adapter shaft that will slip onto the input shaft of the secondary shaft.
so there will be no secondary clutch
As long as the servos are moving I dont see a issue in why it will not work.
Yes the clutch will be under more stress and yes I cant use reverse while the other transmission is in drive. And yea i will have 2 ticks(3 with the tcase) but besides that is there any reason why it wont work.
Can anyone give me a reason why it won't work?
Thankyou
Had a hard time picking a best answer here all were great.
I'm actually going to have the balancer about 4" behind where the front of the frame ends and the radiator and everything else out back. But yea even though I do plan on moving the axles(non stock of course) the front shaft will be longer then the front when I am finished. And yea The sticks are going to look funky(and there won't be much stock firewall to speak of).
I plan on leaving the second trans in 4th(1.0) unless I know I am going on the highway and then will put it into 5th from a stopped or slow craw position.
It is going to look a little funky when I'm done. But, hey what is the fun in driving a stock ride.
Thanks for all the answers
6 Answers
- FirebirdLv 71 decade agoFavorite Answer
No reason it couldn't work. It's a very simple concept, and there's nothing wrong with it.
In order for the rear transmission to shift, its synchronizers would have to control the speed of the front transmission, so I predict that you'll find the front one more "shiftable".
Space limitations are going to be an issue. Those 5 speeds are pretty long, and if you plan on using a divorced transfer case, you can see where the wheelbase of the vehicle needs to be more than 12 feet. Correct me on this, but I believe there is a commercially available kit to put 2 transmissions in series in an early Bronco. At least I saw a mag article years ago where somebody definitely did this. I forget what kind - seems like maybe 2 C6 automatics in series.
- boogie_4wheelLv 71 decade ago
The wheelbase of the Jeep most likely wont be long enough, unless your running some wicked length wheelbase.
The front tranny will be the primary. You will have a hard time shifting the second one while moving. And just think of the shifter throw that second trans is going to have; you will need a stick that you can reach.
You will be better off running double transfer cases. You could still run tall axle ratios for the highway, but use a double low for your crawling.
- ChrisLv 51 decade ago
It would work just fine actually. Just have to make sure everything is square and centered precisely on the 2nd tranny shaft and the first output shaft.
Usually one would do the same thing, but instead would use back to back transfer cases. They are slimmer and may be easier cause they use u-joints to couple which dont have to be exactly centered. You do have a great idea though. It reminds me of coupling two RX7 Rotary motors for more power.
- VerwahLv 51 decade ago
I like your style. That sounds really interesting. If you can fabricate it, I dont see why it would not work. Though I dont know if the extreme ratios on the far ends of the spectrum would make the second transmission coggs spin faster than they were designed too. I suppose It could explode.
- 1 decade ago
i don't think you would be able to shift the second trans unless you are extremely good at clutch-less shifting. actually the clutch would disengage both transmissions. this should actually work. it would be like being able to change the differential gears while your moving.
- Anonymous1 decade ago
Sounds like a pretty good idea, you may go through some trial and error to get it working smoothly but it sounds fairly simple to do.
