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I suppose it is very possible to cause an unintended problem with the transmission while replacing the rear seal as it involves either removing the transmission, or at least pulling it back. If its an automatic transmission, you would have to remove the torque converter and flex-plate. If something doesnt get properly torqued to specs, then Yes you could cause a huge problem. You also run the risk of damaging the drive-line, slip yoke, Universal joints, etc.... Not the best job for a first timer to do in my opinion.

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Q: Can you change a rear seal on a GMC Sierra and somehow mess up the transmission?
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