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Old 09-24-2018, 08:47 AM   #1
Drummerboy
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1987 5.7 FI rear main seal replacement question

Can the rear main seal on my 1987 GMC Sierra Classic be replaced without dropping the tranny and going through the oil pan and dropping my rear main bearing cap? Is it a two price or a one piece? If it's a one piece then this obviously isn't an option. Also, does anyone know if an upgraded seal has been made to correct tr leakage issue or was it simply a bad design?
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Old 09-24-2018, 10:43 AM   #2
GRADYS Performance
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Re: 1987 5.7 FI rear main seal replacement question

1986 and up motors are one piece rear main seals. Use a Fel Pro performance rear main seal for good quality.
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Old 09-24-2018, 10:44 AM   #3
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Re: 1987 5.7 FI rear main seal replacement question

What do you mean by "tr leakage issue"?
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Old 09-24-2018, 03:07 PM   #4
SunSoaked
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Re: 1987 5.7 FI rear main seal replacement question

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Originally Posted by GRADYS Performance View Post
What do you mean by "tr leakage issue"?
I think he meant "the." Still didn't answer the question on whether the pan and trans has to be dropped to replace it. I'm curious as well cause mine has a slight leak as well.
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Old 09-25-2018, 03:36 PM   #5
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Re: 1987 5.7 FI rear main seal replacement question

A motor with a one piece rear main seal will have to have the transmission removed to replace the seal.
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