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How hard is it to replace the rear crankshaft oil seal on a 1993 GMC Sonoma pickup?

My 1993 GMC Sonoma pickup has suddenly developed a massive oil leak. It is coming from the back of the engine. I believe it is the rear oil seal. I cant really tell there is so much oil all on the under carriage of the truck. It has just started and can use about a quart and a half in 50 miles of driving. It also has three codes showing. 13, 34, and 44. What would cause this? It has suddenly started drinking gas like crazy.

The trouble to replace the seal is you have to pull the transmission and the flywheel. A bad seal would not make your truck start using gas though. Something else must have failed to cause the oil leak and the gas usage. I wonder if your cam thrust face could have pushed out the rear cam plug allowing oil to spray out the back into the bellhousing and to alter the ignition timing to the extent you are getting bad gas mileage. Is the truck still running properly? It seems like you would notice a big change in the performance if the ignition timing was to suddenly get a good bit off.

Front Crankshaft Oil Seal Replacement

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