Which POSI wil fit my 69 C10 3 series Differential - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Arl37 · 02-09-2015, 10:12 AM

I have a 69 C10 with the factory 3:07 Ring Gear and Pinion in it. I is my understanding because I have the factory 3:07 it means means I have a 3 series case.
I am going to upgrade to a 3:78. I have purchased a 3:78 R & P from Summit which will fit my 3 series case.
I have now decided I would like to add a POSI. In looking at Summit and Jeggs I seem to get conflicting info as to whether a POSI is available for the 3 series case.
Does anyone have any thoughts on a POSI that would fit 3 series case with the 3:78 gear?
Also, is any modification required to the diff to make the POSI fit?.
Thanks

02-09-2015, 10:12 AM	#1
Arl37 Registered User Join Date: Jul 2011 Location: Valley Center, Ca Posts: 277	Which POSI wil fit my 69 C10 3 series Differential I have a 69 C10 with the factory 3:07 Ring Gear and Pinion in it. I is my understanding because I have the factory 3:07 it means means I have a 3 series case. I am going to upgrade to a 3:78. I have purchased a 3:78 R & P from Summit which will fit my 3 series case. I have now decided I would like to add a POSI. In looking at Summit and Jeggs I seem to get conflicting info as to whether a POSI is available for the 3 series case. Does anyone have any thoughts on a POSI that would fit 3 series case with the 3:78 gear? Also, is any modification required to the diff to make the POSI fit?. Thanks

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