[hawkins1]

Got a 79 f150, mild 460 swap......Should i beef up my 9 inch rear or ditch it for a 60? I have heard their are 40 spline shafts available for the 9.....anybody run a rear 9 and have a secret to keeping it together?

 

[EWmudracing]

i dont know if 40 spline are needed but i would 35 spline would help and nodular center section if your not on a budget

 

[EWmudracing]

and depending on what your doing a 9 in has a way lighter rotating mass and just lighter all together

 

[McQ]

I'm no expert but I'd go with Dexter with the beefed 9. Do the aftermarket hardened 3rd first!!

 

[575ciBronco]

9" All The Way! Went with Yukon Nodular 3rd member, 35 spline mosers and never looked back!

Derrick

 

[crittersf1]

35 spline with strange 3rd. Just be sure to brace the tubes.

 

[strokedmyford]

unless your getting close to the 700hp mark a good stock 9inch will hold up all day long. It should be pulled apart and make sure it is in good condition. The 31 spline axles in good condition will hold up to 750hp the weekest link is the center section. With that being said the stock 9 will hold up just fine with a mild 460 in front of it.

 

[crittersf1]

unless your getting close to the 700hp mark a good stock 9inch will hold up all day long. It should be pulled apart and make sure it is in good condition. The 31 spline axles in good condition will hold up to 750hp the weekest link is the center section. With that being said the stock 9 will hold up just fine with a mild 460 in front of it.

All depends on vehicle weight and how hard it "hooks"

 

[Diggindeeper]

a 60 is hardly an upgrade from a stock 9 inch.
Dont waste your time swapping out a 9 for a 60. upgrade the 9 or go real big.