Rear End Gear ID

[scooter3]

Simple question. I am wanting to figure out which gear is in my car (66 Fury III, 318 Poly Motor, 727 Trans).

I see the numbers stamped on the side of it and a little tag below them.

Which of these are the ID for the rear gear thats in the car?

 

[commando1]

The metal tag has your rear end ratio, Scooter.

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[scooter3]

What ratio is most likely in it? I cant hardly make out the tag. It looks like 6P8 but that can't be right.

 

[commando1]

2.91 or 3.23
That's why owning the Factory Service Manual is 100% essential.

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[polara71]

2.91 or 3.23
That's why owning the Factory Service Manual is 100% essential.

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2:76 isnt a possibility?

 

[commando1]

Possibility but he said most likely.

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[polara71]

Possibility but he said most likely.

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....
OK, I have never been under a 66 my C body experience has been 276s under most. Which makes a good question, which IS the most common

 

[commando1]

I don't think Chrysler broke down the numbers that far.
But for 65- 68.........
> my money is 2.92 on opens and 3.23 on sure-grips in his case and almost across the board.

 

[polara71]

They may not have, I was thinking more of member input, I'd like to know, curiosity.

 

[67-Fury]

my 67 fury convertible has 2:76s in it

 

[commando1]

My 67 383-2 Newport has a 2.91 open
My first 67 383-2 Newport had a 3.23 S/G

 

[scooter3]

I have the factory manual but it didn't tell me which was in it. The factory manual is good but is not explicit enough to make a 100% conclusion. Telling me to get a factory manual every time I have a question is not helpful. If the factory manual has all the answers we don't need tech sections on the forum.

It appears I maybe reading it upside down or backwards. Are the tags usually where you can read them like the stamped numbers on the housing?

 

[polara71]

The tags are usually on the center section under a but on one of the bolts. Its dirty and greasy... Clean it up a bit and put a light on it to see it.

 

[68plymouth383]

Out of 5 parts cars 1967-1968. 4 of them had the 2.76 Opens. One had a 2.94 open. All were 8 3/4 rears. The 2.94 open was in the 67 vip 318 car. The 3 68 fury's all 318 cars, and the 68 monaco with a 383 had the 2.76.

 

[Wildaugust]

I've never looked at mine. Do the tags have the actual ratio stamped on them, 2.76, 2.91, 3.23, 3.55, ect. or do they use a code that you have to look up, for example B73, K27, R9, etc?

(I just made up those codes as an example.)

 

[bulldogchesty]

My 68 Newport had 2:76 open until I changed it to 3:23. What a difference.

 

[polara71]

I've never looked at mine. Do the tags have the actual ratio stamped on them, 2.76, 2.91, 3.23, 3.55, ect. or do they use a code that you have to look up, for example B73, K27, R9, etc?

(I just made up those codes as an example.)

Will have the ratio

 

[detmatt]

2.94 open in the Imp.

 

[Badvert65]

My 65 Sport Fury had 3.23 w/sure-grip but I swapped that out for a 3.91 Sure-grip. I am tempted to swap the 3.91 for a 3.55 (I am on the fence about that).

 

[Mr C]

74 Imperial 4 Dr- 9.25 Diff, 2.76 Sure Grip
74 Imperial 2 Dr- 9.25 Diff, 3.23 Sure Grip
77 T&C- 9.25 Diff, Have no idea. Open

Most C bodies I've dealt with over the years have been 2.76s.