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Chimera

Differential Gear ratio

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Has anyone ever seen the stamping on the differential tube of a vehicle with factory 3.91 posi gear ratio (any year 64-73)? It should have a code of PZ, PS, or PX right? 

 

Thanks for the intel!

 

Gabriel

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Thanks Steve.

 

I have one question about this chart. If you look at the Codes (Riviera Only) list it shows PY under locking for both 3.91 and PY for 3.42GS. Both then it also shows 3.91 as a PZ under the Riviera section or all model section 3.91 is PX or PS.

 

So what would I expect to find if a Riviera had a factory 3.91 regarding the P_ Code?

 

Thank you once again,

Gabriel

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Could be a typo. In your situation I think I’d be happiest to see a PZ code based on this chart. But I’m no expert. Tom! Where are you?

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Shop manual states 3.91 locking diff in the Riv is PS code.

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On 7/12/2018 at 9:25 PM, Rivdrivn said:

Could be a typo. In your situation I think I’d be happiest to see a PZ code based on this chart. But I’m no expert. Tom! Where are you?

Im on the MN/ Canada border without access to any reference material...email me in a month! Lol !

Tom

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