Post A Reply
read DMs/my profile
login
|
join CAFords
|
search
|
faq
|
»
Northern California Ford Owners
»
Automotive
»
Tech Talk
»
can an 8.8 live with a 33 spline posi unit at 900rw
» Post A Reply
Post A Reply
Login Name:
Password:
Message Icon:
Message:
HTML is not enabled.
UBB Code is enabled.
[QUOTE]Originally posted by Boss 327: [QB] Here's some info regarding spline count and axle strength: "When it comes to axles and differentials, there several key specs that you need to know when building or upgrading a rear end. One of the more ambiguous specs is spline count. From the factory, there are several different spline counts, depending on make, model and year of the differential. For custom built rears, you have your choice, but how does one go about choosing their spline count? We talked to JC Cascio of Strange Engineering to find out. The more splines and axle has, the larger the diameter of the axle; as you increase the spline count, the diameter has to go up in order to fit the additional splines. Each spline is the same size whether the axle has 28 35 splines. A typical Ford 9-inch has 28-spline axles, so this is a baseline in terms of size and strength. The actual OD (outside diameter) of a Ford 9-inch 28-spline axle is 1.205-inch. A 31-spline axle is larger in diameter, measuring 1.330-inch; this equates to an axle that is 35-percent stronger than the 28-spline. Here are the actual numbers provided by Strange Engineering: 28 spline-1.205"- Baseline 31 spline-1.330"- +35% 33 spline-1.413"- +60% 35 spline-1.500"- +77% 40 spline-1.710"- +198% Anytime you increase spline count, the differential carrier must be changed to match it, so arbitrarily upgrading to a larger count will cost you money that may be better spend elsewhere. We could fill 4 or 5 pages talking about spline counts, but the gist of the matter is this- Bigger is better but isn't always necessary. This is one of those areas where knowledge and experience of a manufacture is invaluable, given the variables involved. "When it comes to spline count, there isn't a magical formula or number that we can publish," Cascio told us, "Axle strength and spline count go hand in hand, but there are other variables at play here, such as tires, transmission, race or street, ect. An example of this would be a 700 hp full-race drag car with slicks and a trans brake will put more stress on the driveline than a street-tired foot brake car with 1000 hp." [/QB][/QUOTE]
(
how?
)
Instant Emojis
Instant UBB Code
What is UBB Code?
Options
Disable smilies in this post.
*** Click here to review this topic. ***
Questions/Requests/Suggestions? email CAFords
Fueled by
Ford Mustang Owners
on CaliforniaFords.com