OnAll4s

ok after several times of reading about the different TCs. i know the difference in the 231s and the 242s. MY questiong is about the 242s.... i know that when in full-time 4H, it acts as a LSD and transfers some of the power, 52/48, if i can remember correctly.. But everything i read says that when in 4H, part-time, or 4L that it is "locked".... im going to be a NOOB and state that i figure its not actually locked like say being welded, but is it really locked? im beating my head on the table trying to find this out... maybe im just having a retard moment...


also what is the difference in CV vs U-joint type set ups? is one better?

lastly Full floating vs non????

94xj5spd

Locked means that the front and the rear axle are split 50/50

cruiser54

It does not act like a limited slip in the transfer case. It acts like the open differential it is.

mud-dog27

as cruiser said it acts like an open differential, when in 4FT and you turn on dry ground/pavement it disengages the front axle which is why it doesnt bind and bark as it would in 4PT, its nice for winter driving when the road surface differs and you dont gotta worry bout damaging u-joints.

with regards to ujoint/cv are you taking driveshaft or axles?

drive shafts you have you basic single ujoint then you have the double cardon joint which is commonly confused with a CV joint which do not come on our jeeps as far as i know, CV joints are used on the axles of FWD cars. Some jeeps had axle joints with rubber boots but IIRC it was still just a standard u joint.

Copied from wikipedia
Full-floating vs semi-floating

Full-floating

The full-floating design is typically used in most 3/4 and 1-ton light trucks, medium duty trucks and heavy-duty trucks, as well as most agricultural applications, such as large tractors and combines. There are a few exceptions, such as many Land-Rover vehicles. A full-floating axle can be identified by a protruding hub to which the axle shaft flange is bolted. These axles can carry more weight than a semi-floating or non-floating axle assembly because the hubs have two bearings riding on a fixed spindle. The axle shafts themselves do not carry any weight; they serve only to transmit torque from the differential to the wheels. Full-floating axle shafts are retained by the aforementioned flange bolted to the hub, while the hub and bearings are retained on the spindle by a large nut.
Semi-floating

The semi-floating design carry the weight of the vehicle on the axle shaft itself; there is a single bearing at the end of the axle housing that carries the load from the axle and that the axle rotates through. With a semi-floating axle, the axles themselves serve as the inner bearing race and are retained by c-clips that are in the differential carrier. This design is found under most 1/2 ton and lighter trucks and SUV's.


jeeps have semi-floating axles

OnAll4s

Thanks. I guess my real question is, full floaters, like a bronco, when they are locked is the WHOLE axle locked Or is it still open diff? When you lock the hubs is that the equivalent of engaging a locker? Or does that just secure the axle?

I understand about the cv axles now thanks.

OnAll4s

Ohhhhh ok so the full/part time and lock is front to back. I was thinking it referred to left and right like lockers. Thanks guys

mud-dog27

Ok im getting the feeling your mistaking a few terms here. Broncos dont have full floating axles, i think your referring to manual locking hubs.....like this, which allows you to engage and disengage the front axle as opposed to jeep that have automatic hubs meaning the axle internals are spinning all the time, that said no it is not a locker it simply engages the axle allowing power to get to the wheels [technically just one wheel as thats how open diffs work]. A locker allows full power to be sent to both wheels



this is a full floating rear axle


http://what-when-how.com/automobile/...le-automobile/ give this a read for in for on full floating and semi floating rear axles

Just google this stuff and you will get more information than i can give you and it will likely make more sense than me trying to explain it in my words.

xjmarc

Just an FYI your front D30 as well as a Bronco with a solid front axle is a full floating axle. Weight of the vehicle is on the bearings not the axle shafts. All solid front axles are full floaters, locking hubs or not.

mud-dog27

this is true, generally speaking though talk about full floaters and semi floaters is with regards to rear axles.

and i lied earlier bout CVs being for FWD cars...... IFS 4x4s also run CV axles, poor bastards.

Gorillaxj

Grand Cherokee's with AWD also Have CV's

freegdr

early xjs also had them

OnAll4s

Ok I got it now.. Thanks guys

OnAll4s

Ok new question since you guys seem to be helpful... I'm building my lift. I have 3" spacers, JK shocks, do I have to have UCAs or LCAs? Will I still be able to wheel without them or is that highly recommended. Anything else I'm missing? Extended brake lines? Bump stops? What else do I really need. Asked in the lift thread but didn't get a response.

mud-dog27

i dont know what shocks the JKs use as far as mounting points go, might be eyes on either end which will work but need to get the stud to eye adapter for the front, that is if grands are the same as XJs. JKS make them as thats what i have dont know who else makes em. http://store.jksmfg.com/merchant2/me...ory_Code=Shock

UCA wont be needed for a 3" lift, and LCA likely wont either but you may run into the tires hitting the rear of the front fender wells, so if you can score some adjustable LCAs or set length for a 3" kit that would be best.

brake lines are the same you can likely get away with stock but they may get tight at full droop, if ya do end up needing extended lines heres how to do so on the cheap with OEM parts http://www.4x4wire.com/jeep/tech/brakes/xjhoseext02/

as for bump stops......thats up to you, im at 4.5" and my rears deteriorate long ago fronts are stock and ive never had issue and never bother to get any, some will swear that you HAVE to have em but it all comes down to whether or not you want to deal with em.

other things to look at will be drop pitman arm, re-drilling or getting an relocation bracket for the trac bar or an adjustable trac bar but thats money.

OnAll4s

Thanks man... I just acquired a set of fixed LCAs... And I will stick with what I have now until I get my next lift which will be a full LA system