How much HP can stock axels (rear end take?
#1
How much HP can stock axels (rear end take?
Hello... I have a 2004 roush stage 2 manual with a vortech v-1 332 rwhp
I can feel and just barely hear a little slop in rear end when getting on and off throttle quickly. Is that normal?
Also would like to know how much power the stock axels and rear end with street tires and 355-373 gears would safely take? thinking about upping HP and a gear change.
Thanks for any info....
I can feel and just barely hear a little slop in rear end when getting on and off throttle quickly. Is that normal?
Also would like to know how much power the stock axels and rear end with street tires and 355-373 gears would safely take? thinking about upping HP and a gear change.
Thanks for any info....
#4
Power transmission devices like transmissions and gear boxes are rated by torque, not horsepower. The 8.8" 28-spline axle rear end is rated for 1250 lb-ft continuous output torque, and 4600 lb-ft maximum output torque. 31-spline axles ar rated for 1360 lb-ft continuous output and 5100 lb-ft maximum--or about 10 % higher.
Calculating how much horsepower can be supported requires a number of assumptions, predominately final drive ratio, engine speed at maximum torque to the ground, and a guesstimate as to how much that maximum torque might be. As most people start to get glassy-eyed when the math part come up, and just want a simple answer (even if it is an incomplete and incorrect answer), here it is:
Around 400 HP actually passing through the 28-spline axles is a reasonable and practical limit. The "actually passing through the axles" part is important. You could have a 1500 HP engine, but if the tires could not hook up for crap the rear-end may never even see 200 HP passing through it.
Here are driveline analysis, diagnostic and testing procedures from the Shop Manual...
Calculating how much horsepower can be supported requires a number of assumptions, predominately final drive ratio, engine speed at maximum torque to the ground, and a guesstimate as to how much that maximum torque might be. As most people start to get glassy-eyed when the math part come up, and just want a simple answer (even if it is an incomplete and incorrect answer), here it is:
Around 400 HP actually passing through the 28-spline axles is a reasonable and practical limit. The "actually passing through the axles" part is important. You could have a 1500 HP engine, but if the tires could not hook up for crap the rear-end may never even see 200 HP passing through it.
Here are driveline analysis, diagnostic and testing procedures from the Shop Manual...
Last edited by cliffyk; 12-30-2012 at 05:43 PM.
#5
cliffy always has a magical way to give you an accurate answer, lol. With street tires add as much power as your heart desires. If you plan on doing any kind of launching with sticky tires, a steeper gear ratio helps take alot of the stress off of the entire drivetrain. I had around your power level with my Mach. I had ALOT of 5k-6k launches on Mickey Thompsons with 4.10s in an otherwise stock rear. Never had a single issue.
#7
#10
I had 470 rwhp on my 5 speed mustang with Nitto Drag radials with no problems and 3.55gears on stock tranny and rear end. No need to build rear end if you still have stock motor these 8.8 rear ends can take alot of abuse.