4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Around how much RWHP/RWT should you consider 31 spline?

Thread Tools
 
Search this Thread
 
Old 08-07-2010, 07:17 AM
  #1  
jt02gt
2nd Gear Member
Thread Starter
 
jt02gt's Avatar
 
Join Date: May 2010
Location: Nebraska
Posts: 187
Default Around how much RWHP/RWT should you consider 31 spline?

Not that I am anywhere near just curious for future planning.
jt02gt is offline  
Old 08-07-2010, 08:22 AM
  #2  
lizzyfan
Underboss
 
lizzyfan's Avatar
 
Join Date: Jan 2006
Location: Helaware
Posts: 20,273
Default

Not so much the power level (naturally if running BIG power you should switch) but the type of tires. If you are gonna run M/T drag radials or slicks it would be advisable to switch to 31 spline
lizzyfan is offline  
Old 08-07-2010, 08:43 AM
  #3  
teej281
4.6L Section Moderator
 
teej281's Avatar
 
Join Date: Nov 2007
Location: South Central PA
Posts: 10,286
Default

If youre planning on going fast in a straight line...get them. Doesnt matter if you have power or not, if you hook hard enough youre gonna snap them stock 28's. So get them. lol
teej281 is offline  
Old 08-07-2010, 10:08 AM
  #4  
mustangmancp
5th Gear Member
 
mustangmancp's Avatar
 
Join Date: Apr 2006
Location: Missouri
Posts: 4,503
Default

Ive heard goin to a 33 spline??? How much better is it to get those then 31s?
mustangmancp is offline  
Old 08-07-2010, 10:17 AM
  #5  
teej281
4.6L Section Moderator
 
teej281's Avatar
 
Join Date: Nov 2007
Location: South Central PA
Posts: 10,286
Default

They are stronger, but you are very limited on differential choices for those. There are also 35 splines as well but even fewer choices for differentials yet. Also the 35's and i think the 33's as well are a pretty tight fit in our axle tubes but they do fit.
teej281 is offline  
Old 08-07-2010, 10:21 AM
  #6  
mustangmancp
5th Gear Member
 
mustangmancp's Avatar
 
Join Date: Apr 2006
Location: Missouri
Posts: 4,503
Default

So would 31s be good for around 650hp??
mustangmancp is offline  
Old 08-07-2010, 10:23 AM
  #7  
WannaBeGearHead
Go Texas!!!
 
WannaBeGearHead's Avatar
 
Join Date: Jul 2009
Location: Lincoln, NE
Posts: 4,613
Default

Going to 31 spline would be a good idea when you start really "shocking" the rearend. That usually happens when you run sticky tires. Jeremy, since you have an auto (stock converter) and don't have a trans brake you could get away with running MTs longer than other people could because when you are ready to launch your preloading the rearend (by footbraking) so when you floor it you aren't "shocking" the rear as much as a 5 speed guy would or someone on a transbrake. "Shocking" the rear is what kills your rearend.

33 spline would be better than 31 when you are serious about the track, running big slicks and are pushing quiet a bit of power. You would be just fine with 31 spline.
WannaBeGearHead is offline  
Old 08-07-2010, 10:28 AM
  #8  
boduke0220
6th Gear Member
 
boduke0220's Avatar
 
Join Date: Mar 2007
Location: Yadkin, Nc
Posts: 5,183
Default

stock IMO.buddy had an 01 bullitt. bought it at 30k miles, drove the living crap out of the car. at 120k he opened up the rear to put some 3.73's in and spider gears pretty much fell into his hands. never had a sticky tire on there at all. they will be my next mod lol
boduke0220 is offline  
Old 08-07-2010, 12:15 PM
  #9  
jt02gt
2nd Gear Member
Thread Starter
 
jt02gt's Avatar
 
Join Date: May 2010
Location: Nebraska
Posts: 187
Default

im basically wondering on future plans on when to pull the trigger on it thanks for all the insight from everyone on this got a lil better idea of when to do
jt02gt is offline  
Old 08-07-2010, 12:17 PM
  #10  
teej281
4.6L Section Moderator
 
teej281's Avatar
 
Join Date: Nov 2007
Location: South Central PA
Posts: 10,286
Default

like......................




























































































NOW!!! lol
teej281 is offline  


Quick Reply: Around how much RWHP/RWT should you consider 31 spline?



All times are GMT -5. The time now is 06:07 PM.