Loud noise coming from the transmission bell housing

It depends on what fluid and where abouts in the transmission its coming from. If its coming from the bell housing end it might be engine oil from the crank shaft seal inside the bell housing in which case you will be loosing engine oil and not transmission oil - gearbox off and replace the seal. If its coming from a plug or seam on the transmission then it probably wants a re build to cure it but a local garage should be consulted before spending any money.

could be internal piston housing failure for the bands
pull the pan and see what metal is in the pan
there is an aluminium housing that breaks away from the transmission body proper and is replaceable

place the car on a hoist .--- remove the tail shaft.-- support the rear of the engine .--- remove the inspection plate under bell housing--remove battery positive lead-- place a jack or other mobile support under the transmission-- undo the rear engine mount cross member.--- disconnect all wires and connections--If manual remove the gear lever and turret from inside the car or disconnect linkages to the box------ if auto remove the bolts holding the converter to the flex plate and push the converter back towards the gear box. use a piece of thin wire to hole it there by tying a bolt hole back to the bell housing inspection bolt hole. IF manual and auto ---remove the bell housing bolts and pull gear box straight back . watch for transmission oil coming out of the rear of the transmission. Installation is reverse process.

Is this a stick shift or automatic transmission ? Sounds like a bad throw out bearing in the bell housing.

Most likely cause of loud popping noise would be a broken or breaking cv shaft. The cv drive shafts have a rubber boot around the bearings on the shaft. Look for a broken rubber boot on the shaft that runs from the transmission housing to the wheel hub area of front wheel. If you find a broken or cracked boot then most likley the **** needs to be replaced to solve your problem.

You blew front transmission seal.

it will be located at transmission going from engine side into bell housing in transmission ,not sure wheter it left or right side but thats where it will be
i presume it s an automatic transmission
if it is a stick as you call it you can start on a push

Your description sounds much like a problem my son had with his Jeep. If the transmission and engine have ever been separated, there is a good chance that two very hard to reach bolts which hold the tranny and engine together at the flange of the bell housing were never tightened properly. With even normal driving (his isn't), the other bolts can loosen and eventually the angle between the two assemblies becomes too steep to function properly and the input shaft to the transmission can fail.
With a good light, inspect the rear of the engine where it meets the bell housing to see if there is any visible crack between the two. If you can see anything like space there, you may have some expensive repairs ahead.

There should be a tube that comes up from the auto trans with one tab to secure it to the bell housing bolt (trans bell housing bolt goes through tab, then through the bell housing) to the engine block. Pass side.

Possible that it was damaged before and was over looked, or the transmission was not installed flush against the back of the engine block before the torque converter bolts were attached to the flexplate causing an abnormal wear and excessive stress causing it to break.