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Oct 4, 2005 | 10:38 PM

70BuickSleeper

Thread Starter

Member

Joined: Feb 2004

Posts: 100

Likes: 0

From: NJ

Car: 84 Z28

Engine: 305 HO

Transmission: 700r4

rear main seal

My car is an 84 z28 5.0 HO, but I believe the motor was changed at one point with an 86 block. How do I know if I have a one or two piece rear seal? Im leaking a little bit of oil.

Oct 5, 2005 | 04:43 AM

ede

TGO Supporter

Joined: Aug 1999

Posts: 14,811

Likes: 1

From: Jackson County

getting under it and taking a look might be a good start

Oct 5, 2005 | 10:48 AM

SaintedCorrupt

Member

Joined: Aug 2004

Posts: 298

Likes: 1

From: Miami, FL

Car: '85 TA

Engine: Carb'd 350, ported 416s

Transmission: retrofitted T5

Axle/Gears: 3.42 7.62" 10-bolt, locker

i dont remember if they started using one piece RMS in 86 or 88. pretty sure it was 86. either way, the one piece is seal is gonna be significantly bigger that a 2-pc, and its gonna stick out from the block a little more. i'll see if i can get a pic of mine to post for you.

Oct 5, 2005 | 12:54 PM

Stekman

TGO Supporter

Joined: Jul 2003

Posts: 4,803

Likes: 2

From: Grand Rapids, MI

Car: Z28

Engine: Sb2.2 406

Transmission: Jerico 4 speed

Axle/Gears: Ford 9" 3.60

Casting numbers tell all...

Oct 5, 2005 | 08:02 PM

70BuickSleeper

Thread Starter

Member

Joined: Feb 2004

Posts: 100

Likes: 0

From: NJ

Car: 84 Z28

Engine: 305 HO

Transmission: 700r4

Where are the casting numbers located? The size is stamped behind the drivers side head correct? like 5.0 L, and up front on the pass head theres supposed to be a number correct? Where are the numbers I should be looking for, and how do i decode them?