To replace the seal, the mechanic will have to either lift the engine or lower the transmission. You will get much better pricing going to a transmission shop (e.g. AAMCO) and getting a quote from them to replace the seal.
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Re: Rear Main Seal Leak
THat seems to be in the ball park. If you have an AWD, the flat rate time is 14.4 hours. If you have just a FWD, it is 9.5 hours. In either case, the transmission has to be removed from the vehicle to access this seal. Sorry.
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black oil or red oil
if red it is a torque converter seal and the transmission will have to be removed
use a professional auto transmission specialist shop
black oil is sump oil and can be from a rear main seal or leaking from a rocker cover gasket and running down to under the bell housing making it appear as a rear main seal
oil in the bell housing can be rear main seal and it can also be input shaft seal in the gear box if manual. The sump bolts on the rear main cap and will leak next to the bell housing indicating a main seal . If auto then the seal on the converter will leak and the oil will leak out of the bell housing. If you are convinced that it is a main seal then check that there is no crankcase pressure issues to make it leak. Change the engine oil and clean the area and if the oils is clean then that will indicate engine or gear box. Put a white chalk line across any oil paths and watch for it to cross the chalk and change the chalk colour.
In order to replace the rear main seal you will need some auto repair tools and experience . this is a big job , the transmission must be removed to replace this seal, also make sure that the seal is the leak,
oil always flows down, a leak on the top of the engine will flow down and drip at the center rear and look like a rear main seal , make sure that is the leak!!.
Depending on what engine you have and if it has 4 wheel drive the time for a shop to do is from 7 to 10 hours depending on engine size and 4wd,
This could be the rear main seal on the crank shaft that is leaking, clean around all the areas completely to isolate the leak. There are some oil additives available at your parts store that work to cause swelling of the seal to re-seal it. This may or may not work, but it may slow the leak.