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Old 06-17-2007, 05:10 PM   #16
EFI70Blazer
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Join Date: Apr 2006
Location: Pendleton, OR
Posts: 243
Re: posi install difficulties

Quote:
Originally Posted by Alex Hayley View Post
The part numbers I have are:

original unit 3866118
new unit 19556-010

The new unit is a series 4. I believe that the old unit is a series 3. Can anyone verify that for me? I have attempted to search for something that says so but no luck so far. If the original unit is a series 3 then I have an obvious problem.

If your old ring and pinion was 3.73's then your open carrier was a 4 series truck carrier. Unless somone put aftermarket thick gears on a 3 series carrrier.

Could you take some pics of your ring gear part numbers and your old open carrier. To veryify that you do have 3.73 gears count the number of ring gear teeth and divide by the number of pinion teeth. Also maybe take a pic intalled so we can see what is going on.


Looks like your new carrier is correct for 3.73 gears and up. It is a 4 series for a truck 12 bolt rear. Her is a link from Summit.

http://store.summitracing.com/partde...5&autoview=sku
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