doubling up sammy t-cases

[Depot]

last nite I was yappin to Andrew down in Nova Scotia and he asked me about this and Im asking all u out there for some input...

his suggestion about doubling t-cases..

eliminate the jackshaft - make it short as hell. put one t-case right up in there but here's the catch... upside down.. just clock it 180 degrees or however far u can.

next, connect the second t-case to the first. rear output flange of t-case one to input flange of case 2. maybe even direct bolt to save space. plenty of available ideas here for this connection to save space....

what ur left with is both outputs on t-case 2 are in line, just different lengths depending on how tight u pack it all in.

more details - for the sake of arguments, lets say the first t-case is a stock one and the second has 4-1 gears in it. the second t-case is the one u-d be shifting from 2 to 4 and low to high. the first would only be shifted from 4 low to 4 high and back, no need for 2 wd since the front output on the first case doesnt bolt to nutin.

obvious problems - 1 - oil pissin out the shifter handle - Looking for ideas here!!!!

shifter handle is now pointing down under the truck - one could almost live with this - say shorten it up a lot - get out and shift when u need that ultra low - maybe even hook up a cable system to shift since it is shifting in a straight line now (4 low to 4 high and back, no 2 wd)

another option for shifting is more custom - using a linear actuator - remove the 4wd shift fork, connect a linear actuator to the low/high fork, seal the shift fork hole permanently and install the actuator. much more custom and requires ability to weld aluminum but its an idea.

ok, so thres the idea - pros? cons? how to do it? problems u think will occur? solutions around thsoe problems? lets get them brain juices flowing


D

[SuziCrazy]

I've been seriously considering this setup. Here's a few more questions for you.

1- Why would you need to flip the first t-case completly upside down and not just side ways, and bend the shifter? (or vise-versa)

2- Wouldn't using the 4:1 t-case in the front give you more gearing.

and finally to connect the 2 cases together you could use a driveshaft spacer, making this setup fairly compact.

[Fullload]

You would spend more time fabbing brackets and "trying to get it right and keep it from blowing up etc. I would rather save the money and have someone else do the R&D.
It has been done before and the only problem had was that the second case had to be clocked which resulted in oil spilling out of the vent tube and on extreme angles it would come out through the (untightly sealed) shifter. Both easily to deal with i guess but. there is no way it could be done without it looking hacked. But anything will work with enough time invested in it.

[MuddMachine]

Go buy a 'rock box' you cheap bastards :D

[Depot]

Originally posted by SuziCrazy
1- Why would you need to flip the first t-case completly upside down and not just side ways, and bend the shifter? (or vise-versa)

2- Wouldn't using the 4:1 t-case in the front give you more gearing.

1 -sideways results in second t-case being 2 low - u wanna get the rear output flange on case one nice and high when it meets the input flange of case 2.

2 - I've heard that putting the 4-1 case in first causes the second case to break - too much torque for a sammy t-case input - rumour mill, dont have any first hand experience myself.

D

[Depot]

Originally posted by Fullload
the only problem had was that the second case had to be clocked which resulted in oil spilling out of the vent tube and on extreme angles it would come out through the (untightly sealed) shifter.

yep - but this case we wanna clock the first case - im looking for suggestions on how to get around the leaky shifter. vent cap can be moved easily enough.

How about if instead of gear oil in case one, we used some sort of grease? only as an offroad machine now, not on road.

D

[Mudslug]

I wouldn't....I would be patient

Or if you are really wanting to go that way do this.

[Depot]

Originally posted by MuddMachine
Go buy a 'rock box' you cheap bastards :D

Got me a 4:1 already :) the reason I like this idea is cause of some of the #'s...

Hi range 1.409:1
LO range 2.268:1

this is for a post 84 case. slam 2 of these stock cases together and u get..

Hi - 1.409*1.409 = 1.985:1
Hi-low 1.4*2.2 = 3.196:1
low-low = 5.144:1


using a 4:1 case in the mix (hi = 1.580:1, low = 4.160:1)

Hi - hi = 2.226:1
hi-low = 5.861:1
low-hi = 3.583:1
low-low = 9.435:1

See where Im going with this? Its a great and versatile set-up. leave those 373's in the pumkins. the best part is yet to come - another thread about transmissions...

D

[Depot]

thats prettymuch the idea mudslug but by clocking the first case soo much, it wont leave the second case so low or at least thats the idea.

D

[Mudslug]

I talked with a guy that did this in the US, basically don't do it. Once you clock the case that much you WILL run into all kinds of oiling problems, those who say you won't have not done it yet.

However, Scott and I had two cases on the ground in my garage contorted in every possible position in order to make it work and there is a way to make it work but the shifters wound be a bastard to do and your outputs would end up dropping 4 inches...you cannot get around that.

So I would be patient for a wee while............

:cool: :cool:

[vanbdan]

hmmm....why are you pushing the patience ? working on something are we?

[GearHead]

why use two sammy cases? just because you have them?
I have seen two cool setups that i like.
The 1st was to use a kick tranny and tcase, you cut off and cap the chain driven fwd portion and mount the sammy case to the rear.
The 2nd was i 5 speed volvo tranny cramed inbetween the sammy tranny and the tcase. I love the idea of stacking trannys.
you would have 32 forward speeds, you would wind up with cool ratios like, double overdrive, or double reverse - the 26th forward gear.

later
steve

[lil beast]

ive hear about the volvo tranny one and its like adding a rock box. the next time i go to the wreckers im lookin at that up close...:D

[Fullload]

I've seen the volvo thing done before. Shit sometimes when i wheel i cannot find one shifter let alone two tranny shifters to deal with.:roll:

[rockrat]

It can be done with patience

http://www.4play4wheelers.com/dual_t-case.jpg

[MuddMachine]

Originally posted by rockrat
It can be done with patience


Well I dont know cuz I havent done it but....... I dont like the solid flange to flange mounting for 1. On another note, it looks like the second case will be sitting partially inside the truck. Yeah ?