i have a 97 4.6 f150 xlt 2wd........my question is i got a great deal on motor and tranny and after i am done it will be producing 550-600 hp and about the same amout of tq....and i wanted to know will the stock rear end hold/drive shaft? and i will be using it for regular driving and occautional 1/4 mile runs...thaks for the help

 

I'm pretty sure the F150 has a different rear end depending on whether you got the 4.6L vs 5.4L engine.. This is one way I can quickly tell if someone has the 5.4L vs 4.6, the pumpkin is larger on the 5.4L's..

I'd be careful how much torque you put on the rear end you have.

 

well like i said i have the 4.6 in there now but i got this sweet deal on a new motor and tranny and after i do a few mods to the new motor it will have around 550-600 hp and about 600 ft torque.....u think the stock rear end will hold 600 ftlbs. of toruqe?

 

What kind of motor do you have that's producing 600 hp and torque? Outside of being a nascar race engine, i haven't seen many smallblocks making that kind of HP/TQ. If it's a big block, are you sure it will fit in a F150?

Will the rear end hold up? Depends on how you actually use it, but i highly doubt it will last longterm. It's not designed for the hp/tq numbers your suggesting.

Since you got such a great deal on the motor, you should have enough money to put a ford 9" built rearend in. Many street rods use them due to their toughness.

Best of luck. Keep the dream alive.

 

ok thats just waht i was looking for..............but i'm sure u are familur with the cobra "R" well the motor is a cobar "R" 5.4L DOHC and it stock is getting 385 hp/tq and i am getting the 6 speed tranny along wiht it.........but i plan on getting those numbers after i get the supercharger that i want and a few other mods...........thanks for ur help

 

HI!... Since you are using a truck that origanally came with a 4.6, you have the 8.8 rearend. It will NOT handle that much H.P/TORQUE. All 5.4 equipped F-15's come with the STERLING 9.75 rearend. This is the same rearend used in the LIGHTNING. It will handle that much H.P/TORQUE. There are LIGHTNING guys running 11's and high 10's with this rearend STOCK and hav'nt been having problems YET. The 9.75 is a very strong rearend when equipped with a posi. As for a small block making that kind of power? That's easy. I have a 351-w that's making 713H.P (FLYWHEEL) N/A!

 

ok thanks neal!