School me on my Transfercase

[thomas7.3psd]

whats inside, on an 02 superduty. is it gears or chain or both? thx.

[NoRalPh]

Both

If you select 4WD with a vacuum sw on the dash it's probably a NewProcess 273 and if you have a shifter on the floor to engage 4WD a 271

They're pretty simple inside, really just a 2spd tranny (for LowRange) and the Input & Output shafts are connected with that BIG chain

[thomas7.3psd]

Thankyou sir, i have this running on 3 forums and your the first to answer me all day. Thankyou. Its the switch on the dash. next question: when in 2wd is the chain used to transfer power through the case or it directy connected between the transmission and the drive shaft? The chain would be used for 4wd correct?

[NoRalPh]

The chain only comes into play in 4WD.

In 2WD the TC is just a big, tailshaft.

[Flooringit]

For some reason I lt also works the chain in nuetral. I had mine out to fix shift fork pads and tested it to see I had everything hooked up right. I tested it by hand on the bench. I was wondering why the chain works in nuetral. Anyone knowy friends a trans guy but I forgot to ask him

[thomas7.3psd]

ok thx everyone, im just trying to figure out some drivetrain slack i have mostly when the TC locks(half throttle) i get a bucking feal. it doesnt do i consistantly and it doesnt do it at all under load or at full trottle. i just put traction bars on it but they didnt realy help. the transmission has a PI stallion tc and a BTS vb. thanks