i have a 02 gmc sierra 1500 extended cab, 5speed manual tranny. the rear main transmission seal is worn out and i want to replace it myself. need acvice on removing seal

Asked by Jan 11, 2016 at 05:56 PM about the 2002 GMC Sierra 1500 SL Extended Cab SB

Question type: Maintenance & Repair

i need some advice on proper way to remove bad seal and installing new one.  
i have done this once before on the same truck and it had minor leak in it
since so i dont want that to happen again. ive already had to have tranny
rebuilt but the machanic didnt replace rear main tranny seal. any help would
be greatly appreciated.

3 Answers

76,745

Lubricate the rubber seal to prevent damage to the lip and tap the seal in evenly. If the output shaft is worn where the seal meets the shaft then you will have more leaks.

do i use a flat head screwdriver to take bad one off?

76,745

You may want to invest in a seal puller as they don't cost much. What ever you do, don't scratch the output shaft.

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