Topic: Rear end numbers decoded please
in Forum: C3 Driveline Components
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Houston, TX - USA
Joined: 2/7/2008
Posts: 93
Vette(s): 1970 454 4 speed A/C power everything else
Do these make any sense.........2 CAT 318 70W
Thanks!
Thanks!
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
2 = Plant Shift number
CAT = 3.08 Heavy Dooty Posi unit for a 454 engine
318 = the Julian date the diff was assembled(sometime in early November)
70 = I'm assuming would be for the '70 model year, but I'm not sure...
W = Warren Motive...the plant where the diff was assembled OR Warner Gear supplied posi unit...not sure how the earlier units were identified.
CAT = 3.08 Heavy Dooty Posi unit for a 454 engine
318 = the Julian date the diff was assembled(sometime in early November)
70 = I'm assuming would be for the '70 model year, but I'm not sure...
W = Warren Motive...the plant where the diff was assembled OR Warner Gear supplied posi unit...not sure how the earlier units were identified.
Joel Adams
C3VR Lifetime Member #56 
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Former Member
Send PM
Houston, TX - USA
Joined: 2/7/2008
Posts: 93
Vette(s): 1970 454 4 speed A/C power everything else
Thanks!
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20219
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Anthony(Ten15) has informed me that the dating on the earlier diffs is different than later ones...so. the Julian date I posted is not correct.
The correct date would be 3-18-70(318 70)
Sorry for the goof, and thanks Anthony for calling it to my attention.
The correct date would be 3-18-70(318 70)
Sorry for the goof, and thanks Anthony for calling it to my attention.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Driveline Components
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