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I take it this a manual gear box and the seal you refer to is the pinion output shaft seal? It sounds like your gear box has a severe fault, maybe a chewed up bearing and this is causing the output shaft to precess which will open up a small gap with with the seal allowing fluid to exit. When the seals were changed what did the transmission oil look like?. Was it opaque and murky - it should be clear and red. Drain the gear box and collect the fluid through a muslin cloth and then insert a finger in the drain plug hole and feel around the base of the gear box. If there is a thick layer of fine grey paste on the gear box bottom plate this is bad sign it is casing material. Does the muslin cloth contain any particulates of hard metal, theses are fragments of case hardened gear teeth. If so the gear box is done for and will need replacing. It might be possible to repair the box but the chances very much are that getting a good used one from a reputable breaker will be much cheaper. Always do the finger check on a gear box when drained of fluid - the stuff that sticks to your finger will tells you a lot about the general condition. A good gear box free of wear has no deposits.
hi, some people do this wrong when checking the fluid in the box, i gather it is an auto box?, when checking correct amount of fluid in an auto box the engine has to be running to get the correct mark on the auto-box dip stick, strange as it seems this is normal to do, unlike engine where it has to be not running, try running engine then check fluid, if lower then max line top up, then run again till you get the correct level if it is a manual gear box, just top up the fluid till it starts running out of the filler plug, that then means its the correct level, but do not run it if manual gear box....hope this helped
there may be a drain plug on the gear box sump or you may need to take the gear box sump off to drain the oil out,,,thats a bit messey,,,
dont get any dirt in you gear box
If the fluid is full , it sounds like the trans pump is loosing prime. If it is there will be a code set. The code will not always turn on the light. Go have the codes checked. If it does have a loss of prime code in the trans computor and the fluid is full then you will need the trans pump replaced
Believe it or not there are some problems you should take to the dealer. It never was the gear box, its a defective steering column bushing. That problem had a factory notice and the dealer would have diagnosed it immediately an fixed it free parts +$40.install. Tahoes get that problem.
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