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Discussion Starter · #1 ·
i was woundering what size rear end my truck has in it its a 87 d100 had the 225 in it i will be putting the 440 in it in the next week or so and i wanted to make sure the readend would hold up. also i wanted to know if i should maybe out like a posi in it? any help would be a big help
 

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more then likely its a 8 1/4 axle or technically in your case a 8 3/8 which is the same thing. It probably wont' hold up to a 440 long. I would change it out to a 9 1/4.
 

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Discussion Starter · #3 ·
nope its a 9 1/4 its got the stop sign cover thanks guys
 

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9.25s have been used in Dodge cars and trucks with the 440 before. For something different, some of the older Mopar muscle cars used to come with semi floating Dana 60s behind the 440s and 426 Hemi engines. These axles are getting harder and harder to find, so don't hold yer breath. If you come across one, get it quick!

Definately install a limited slip (Please don't call it a Posi...Thats a GM term for limited slip!)

Ed
 

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this may sound crazy to you all but i would go with ford 9 inch.... they are a dam strong rear end with the 31 spline shafts
 

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RXT said:
9 For something different, some of the older Mopar muscle cars used to come with semi floating Dana 60s behind the 440s and 426 Hemi engines. These axles
Ed
The only real advantage to the SF D60 is that you can gear lower than 4.56. And its not held in by the C-clips either. The 9 1/4 also has bigger axle shafts than the SF and FF D60's. Even with my limited knowledge of axles, why anyone would want a SF D60 when a 9 1/4 could be had for cheaper is beyond me :p
 

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i still say ford 9 inch... many here may not like using anything but a dodge part, but 9 inches are strong and simple. And the axles are not held with any c clips and the carrier its easy to work on because you can remove the whole thing and work on it, so you dont have to lay on the floor and do it. Ford 9 inch with 31 spline axles is a good set up. But im not saying that a D60 isnt strong, they are, maybe stronger, but not near as simple
 

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9 inch axles are strong but over rated. They are light and thats what makes them popular for drag racing. I believe the 9 1/4 is stronger and i've read the 8 3/4 is stronger then a 9 inch Ford.
 

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Dodge 85 RC said:
The only real advantage to the SF D60 is that you can gear lower than 4.56. And its not held in by the C-clips either. The 9 1/4 also has bigger axle shafts than the SF and FF D60's. Even with my limited knowledge of axles, why anyone would want a SF D60 when a 9 1/4 could be had for cheaper is beyond me :p
Sorry but I have to add in more Dana 60 advantages, It has a larger ring and pinion gear, which is stronger, and you have many more options in gear ratios, and if you wish, you can swap to larger axleshafts.

Ed
 
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