14 bolt FF with locking diff. Fluid?

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Jethro224

Jethro224

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Does a 14 bolt full floating rear with factory locking diff use GL5 80w90?
1980 K20.
 
Jethro224

Jethro224

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The guy at the part store said that's what to run. I couldn't find anywhere that specified locker or open so that's what I'm doing.
 
Bextreme04

Bextreme04

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The G80 in the 14 bolt does not need any kind of additive as far as I know. Mine is open, but I also just run standard GL5 80w-90
 
Jethro224

Jethro224

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Thanks for the reply. I can't find much info on the locking rear.
 
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