Any other parts I need for manual t-case conv.?

[Jackrabbit]

I have decided to buy a manual 1354 transfer case for my '94 5-speed 4.0L 4x4 (Mazda B4000) instead of paying more money to have the current problems diagnosed (especially now that my trustworthy tranmission guy retired ).

My questions are:
1. Are there any other parts I will need to get from the wrecking yard other than the t-case, shifter, dash plate, and floor plate?

2. How do the automatic hubs on the '94's activate with a manual t-case?

The Tech Library write-up didn't say.

Any help is greatly appreciated. I plan to take pictures of the whole change out to go with the tech sheet in the Technical Library.

 

[mjonesjr]

My questions are:
1. Are there any other parts I will need to get from the wrecking yard other than the t-case, shifter, dash plate, and floor plate?

2. How do the automatic hubs on the '94's activate with a manual t-case

1. Nope, that is all the parts you will need.

2. The same way they do now with an electric, automatically.

 

[AllanD]

However there is no "Spin up clutch" in the manual T-case so if you attempt to shift into 4x4 while moving the front output won't be spinning

You'll need to swap manual hubs onto the truck (and have them locked-in when you think you might need 4x4) to have "shift on the fly" capability.

AD

 

[Jackrabbit]

However there is no "Spin up clutch" in the manual T-case so if you attempt to shift into 4x4 while moving the front output won't be spinning

You'll need to swap manual hubs onto the truck (and have them locked-in when you think you might need 4x4) to have "shift on the fly" capability.

AD

So what you're saying is that I will need to stop and push in the clutch completely before shifting into 4-wheel-drive with my current automatic hubs?

 

[Jackrabbit]

2. The same way they do now with an electric, automatically.

Could you elaborate on exactly how the system is activated? Is it a switch on the selector or something? That's the part I am having trouble understanding. Thanks.

Ken

 

[AllanD]

The automatic hubs are engaged by the rotation of the front axle shafts.

when you are driving down the road in 2wd and the hubs disengaged
NONE of the front driver parts are actually spinning.

the axle shafts, differential, front drive shaft and chain drive inside the t-case, all are stationary...

You can't simply shift into 4x4 or you'll hear loud expen$ive sounding crashing noises.

With an electrically shifter T-case the first thing that happens when you push the switch is that the controller unit poweres up an oversized electromagnetic clutch inside the T-case that "spins up" the front drive components, but doesn't actually move the shift collar that engages the chain drive until the speed sensor tells the controller that it's up to speed, then the shift motor is energized and it moves the shift fork.

At that point you still aren't necissarily in 4x4 because the hubs won't actually lock until they run up on their internal cams by rotating at a different speed from the axle shaft that drives them.

If this all seems rather hit or miss you're getting it...


Now with a MAnual T-case there is no way to make the front shafts spin if you are already moving so you must come to a full shop before you move the shift lever
or you'll hear the engagement collar inside the t-case complain (loudly).

At that point you may proceed, IF you trust the auto hubs to operate as intended
(you are foolish in the extreme if you do)

in a truck with a manual T-case and MANUAL hubs
when you think you MIGHT need 4x4 you lock the hubs before you get in the truck.

That way everything is already spinning and you can move the t-case shift lever from 2hi to 4hi at ANY time moving or stationary.

Provided you aren't sitting and spinning your wheels.

No waiting for a controller unit to decide it's ok.

Frankly I think the only things auto-hubs do "automatically"
is to either provide a false sense of security and to fail unexpectedly.


AD

 

[mjonesjr]

The automatic hubs are engaged by the rotation of the front axle shafts.

when you are driving down the road in 2wd and the hubs disengaged
NONE of the front driver parts are actually spinning.

When I had auto hubs on my '97 Ranger, once I switched from 4wd to 2wd, I had to back up about 10 feet before the hubs disengaged. If I didn't back up, they would stay engaged and turn the front axle shafts.

 

[dangerranger83]

Basicly keep it simple, make it all manual.

Thats at least what I would do. Thats how my truck is/came.

 

[Jackrabbit]

Ok, starting to get the whole "I need manual hubs or life could get painful" thing. Two questions:

1. Which are the best manual hubs for a '94?
2. When all is said and done, do I pull the control module out of the fuse-box? (probably a really dumb question)

Thanks for all the help and explainations so far.