Competition 80 vs 70 strength comparison

[2broke2smoke]

posted this on 2nd gen forum and got no answers ...



apparently they're too busy discussing tires, radios and window tint



axles to compare are 96 cab/chassis 3500 dana 80 and '01 srw drum braked 70



can anyone tell me the diameter of the pinions and diameter/spline count on the both axles ... (axle tube thickness of both would get you a barley pop at indy this summer)



would like to check locker/spool availability and don't want to depend on the salesmen for proper specs

 

[GO 4LO]

Not 100% sure, but the numbers sticking in my head are 2" dia. pinion, 11. 25" ring gear with 1/2" bolts, 1. 5" 35-spline axles on our 80 hybrids, and 1. 62" 37-spline axles on the full 80's. 70's have the same size shafts as our hybrid 80's.

Chris

 

[GO 4LO]

Oh, and the tubes might be 4" od, 5/8" wall, but I'm not too certain on that one...

 

[PSU-CE]

You can get some info off of



http://dodgeram.org/tech/specs/axle/rear_axle.html



I beilieve that the tube diameters are 4" for 80, 3. 5" for 70, and 3" for 60 but I don't have them in front of me to double check. The wall thickness of the 80 is around 5/16". The easiest way to check the wall thickness would be to unscrew the breather out of the axle tube and then you can see/measure the thickness. In most cases you are probably best to go with the 80 for a performance vehicle.

 

[2broke2smoke]

thanks guys, good info ...



GO4LO i was hoping to find out what my new 80 has in it ... i've heard that all dodges have the smaller 70 axles ...



just have to pull one i suppose



and the pinion nut looked huge in comparison to the 70 i took out

 

[GO 4LO]

Yeah, Dodges all have 80 hybrids, not full 80's, so you definitely have the 1. 5" axles...

Chris

 

[NPloysa]

Comparing the 70 and 80 is like comparing "axles to axles"

 

[ob1kobi]

Can I ask where you picked the 80 up and what did it cost ya? I might be in the market for one myslef so just curious since I see your not all that far away from me.



Thanks,

Ted

 

[2broke2smoke]

look in the classified for the dana 80s for sale ad



he's located in greenville pa, has two wide duallys left and one cab/chassis



all are 3. 54, DRUMS and open ... don't think that'll help your truck though



these are new, never been in a truck ... he even has the dodge shipping container the axles arrive on ... pretty neat



and contrary to other posts on here the 96 cab/chassis is two inches narrower than my '01 srw drum braked 70 that i took out