need help rear wheels lock while driving

[damnthecops]

this only happens once and a while... ill be driving and then all of a sudden the car vibrates really bad and the the rear wheels lock up ... but r chirpping... so they r not completly locked... i pull over then i put it back into 1st and its fines.... once and a while after it happens and i put it back into first as im driving off i hear a very loud and bad clunk.... the thing is i just got a new tranny and a new transfer case that came with the tranny... i checked the fluid in the rear diff and it looks brand new and it is not low... need help dont know what it could be

 

[Defiant]

Have a shop inspect that before it kills you and possibly someone else who doesn't deserve it. Do NOT drive it as it is.

 

[damnthecops]

this only happens once and a while... ill be driving and then all of a sudden the car vibrates really bad and the the rear wheels lock up ... but r chirpping... so they r not completly locked... i pull over then i put it back into 1st and its fines.... once and a while after it happens and i put it back into first as im driving off i hear a very loud and bad clunk.... the thing is i just got a new tranny and a new transfer case that came with the tranny... i checked the fluid in the rear diff and it looks brand new and it is not low... need help dont know what it could be

 

[ASZRAEL1266]

Where did you get the tranny from? Everything i know tells me to check your xfer case.

 

[damnthecops]

my mechanic got it from his jdm guy... he gets his trannies and his motors from him... but the only other thing it may be is.... my parking brake is screwed up... when i pull it up it gets stuck there and we have to release it wiht a screw driver... its possible that it is some how getting engaged while all this is happeneing... it only happens when i have been crusing on a highway... around 45mph n up.. but i dont see how it would release after they ahve already locked up

 

[crankbender]

man it could be anything....but here are a few places to look

broken center diff
transfer case siesing
rear diff siesing
emergency brake problem

the likelyhood of it being anything other than the center diff or xfer case is very small. If these 2 pieces are in good order if the rear wheels lock the front ones will too .

 

[damnthecops]

yeh only rear locks... not front... i heard it is possible that since my e brake is messed up...(when i use it it locks and i have to manually un lock it fromwheel) so i dont use it. the caliper may be a little stuck and as i drive it it heats up and locks and once i drive off the clunck is the caliper releaseing