Searching for a posi rear for 1968 Oldsmobile 98 coupe. Please help?
Moderator
Joined: Jul 2007
Posts: 18,221
From: Edmond, OK
Jorge, a Vista Cruiser differential won't fit your 68 98. You need a differential from a 98 or Delta 88. I'm not sure if a differential from a Buick Electra, Chevy Impala or Pontiac Bonneville will work. Unfortunately, these are quite rare. From time to time one of our members; monzaz, has one for sale. Good luck in your search.
Old(s) Fart
Joined: Mar 2007
Posts: 50,791
From: Northern VA
Your Ninety Eight could have either a Pontiac 8.875" axle (NOT to be confused with the Chevy 12-bolt) or a Type O 9.3" axle. The Pontiac has a ten bolt cover and twelve bolt ring gear. The Type O has a twelve bolt cover and twelve bolt ring gear. Fabcraft Metalworks sells new posi units for the Pontiac axle. No one makes new posi units for the 9.3" Type O (this is NOT the same as a Cutlass Type O). Finding a used one is your only option for that axle. Most 1968 Ninety Eights got the Type O.
Registered User
Joined: Apr 2018
Posts: 84
From: Cobleskill NY 12043
Your Ninety Eight could have either a Pontiac 8.875" axle (NOT to be confused with the Chevy 12-bolt) or a Type O 9.3" axle. The Pontiac has a ten bolt cover and twelve bolt ring gear. The Type O has a twelve bolt cover and twelve bolt ring gear. Fabcraft Metalworks sells new posi units for the Pontiac axle. No one makes new posi units for the 9.3" Type O (this is NOT the same as a Cutlass Type O). Finding a used one is your only option for that axle. Most 1968 Ninety Eights got the Type O.
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