Topic: quick t-case question

[red]

just out of curiosity what is the difference between the 4cyl t-case and the 6cyl t-case?

[jimbo74]

4 cyl is gear driven and upgradeable, 6 cyl is chain driven and not upgradeable

[red [OP]]

so if i was to put a toyota t-case behind a chevy v8 i should go with the 4 cyl t-case?

[blackdiamond]

so if i was to put a toyota t-case behind a chevy v8 i should go with the 4 cyl t-case?

Aftermarker low range gears or dual adapters are not available for the 6 cyl cases.  If you want the joy of owning a toy you would need the 4 cyl cases until someone develops something for the 6 cyl ones.

With a V8 I would suggest a 23-spline turbo for added strength.   

[yotaboy79]

use one from a turbo truck with the 23 spline input and if your hard on crap maybey a crioed out put shaft too

[red [OP]]

it would be going in my 81 gmc. sm465, currently 305 gasser but might swap to a diesel, 400 ft/lbs of torque max.

so a 4cyl t-case
23 spline input
cryo'd output shaft
4.7 gears
what else would it need? i'd like to put it in and not have to worry about it besides changing the fluid.

[BLACKDOG]

Aftermarker low range gears or dual adapters are not available for the 6 cyl cases.  If you want the joy of owning a toy you would need the 4 cyl cases until someone develops something for the 6 cyl ones.

With a V8 I would suggest a 23-spline turbo for added strength.   

Our good friends @ Marlin have developed something for the 6cyl.  t-cases   Using the MC10, you can have the chain drive t-case as your rear t-case.  I have it in my truck. 

However, they did take a long time to develop it because they weren't sure of the strength of the chain drive case.  The decided it would be strong enough to make a dual case adapter, but I'm not sure if it'll hold up to a v8    I'd go with a turbo 23spline dual setup(4cyl) myself.

[yotaboy79]

and if your going with a toyota tranny run the r151 turbo 4cyl tranny

[red [OP]]

and if your going with a toyota tranny run the r151 turbo 4cyl tranny

thanks for the info on the tranny, but i'll be sticking with my sm465.

[Trail-runner]

why wouldn't you use a np205? With the cost of all the adapters you could by a 203 to 205 doubler.   

[RABIDYOTA]

i'm with him  /\  205/203

[red [OP]]

i checked on marlins website and it says that the 4cyl t-case will bolt up to the sm465 (which is what is in the truck right now), so no adapter would be needed for that. (other than my speedometer)
reason i dont want to go to a 205/203 doubler is because thats all the gearing i could go to, no lower than at most a 3:1 in the 205 and the stock 2:1 (around there) in the 203. if i go with the marlin t-case i will go with 4.7:1, then later down the road go maybe get a crawlbox as well (if needed). also the cost. lets say i buy rebuilt t-cases that are setup how i want, from marlin a 4cyl case with the strength upgrades would run me about 1000 (plus core). an np205 or an np203 will each cost me about 700 a piece. a dana 300 (another option, 4:1 low range) should bolt up, but built to what i would want would run me about 1200 in parts, plus the t-case itself.

a 205/203 doubler would be the strongest setup, but for starters i dont have a big block (and wont go to one), and i stay easy on the skinny pedal. i'll swap to a diesel motor in my truck and aim for 400 ft/lbs of torque, very easy to get safely and reliably, horsepower will be about 200. so the strength of this combo wouldnt even be tested.

an upgraded dana 300 can easily survive that, plus i could put a klune V underdrive on later.

a toyota 4cyl with the  strength upgrades (cryoed shafts, i'll have to talk to marlin when i get around to buying a t-case) should be just fine.

[RABIDYOTA]

torque breaks more things than horse power.  now multiply 400 ft/lbs x 4.7 = snap!!

[blackdiamond]

torque breaks more things than horse power.  now multiply 400 ft/lbs x 4.7 = snap!!

To quote a redneck that I made up, "Horsepower ain't nuthing but the result of some addin and minusing, it ain't real."

You add up Marlin's mathematical torque and snap as well.  When you're geared low enough it reduces the chances of breaking things, but I agree that 400 lb-ft has the potential to destroy.