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Strengthen Ford 8.8 IFS?

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#21 ·
RXT said:
Normally I'd be in agreement with a Dana 60 SAS, but for drag racing, a Dana 60 is gonna add a bunch of weight...... I thought about this for awhile. For a 4x4 that sees off road duty, greater axle strength at the cost of weight is often worth it....but for the 1/4 mile weight creates a huge penalty for lowest et. But I'm also thinking that your 8.8 would hold up because in drag racing, it's the rear that takes the brunt of the launch abuse, due to weight transfer going to the rear under acceleration. The front end will tend to unload which may give you the advantage of less possibility of breakage.

Of course I could be wrong, but that's my theory and I'm sticking to it

Ed
Click to expand...
Building on this, I'd switch to 2wd before doing an SAS.
 
Discussion starter · #22 · (Edited)
Stumbled on a handy chart...

8.8 Ford IFS is rated at 1250 continuous & 4600 max torque (comparable to the 9.25" Chevy heavy duty IFS)

8.25 Chevy IFS is rated at 3581 max torque

Dana 60 front is rated at 1500 continuous & 5550 max torque

Thinking if a "bone stock" 28 spline 10 bolt 8.25 Chevy lives on 1000 HP awd trucks I should be good to go with my 28 spline 10 bolt 8.8 stocker with upgraded axles. Anybody know how wheel size and gear ratios play into these figures??

________________________________________

(In lb-ft, from published axle manufacturers' sources)

Notes
A "+" indicates that the manufacturer offers higher-rated versions.
*Continuous Output Torque
** Maximum Output Torque

Axle COT (lb-ft)*/ MOT(lb-ft)**
AAM/GM 7.25 IFS-2,333
AAM/GM 8.25 IFS-3,581
AAM/GM 9.25 IFS-4,643
AAM 9.25 Front-4,663
AAM/GM 7.63 SF Rear-3,165
AAM/GM 8.5/8.6 SF Rear-3,829
AAM/GM 9.5 SF Rear-4,993
AAM/GM 10.50 FF Rear-6,242+
AAM/GM 11.50 FF Rear-8,321+
Dana 28 TTB 575 / 2,350
Dana 30 Front (all) 640 / 2,350
Dana 35 TTB & IFS 920 / 3,700
Dana 44 Beam & TTB 1,100 / 3,460
Dana 50 Beam & TTB 1,200 / 5,000
Dana 60 Front 1,500 / 5,550
Dana 70 Front 2,000 / 8,000
Dana 35 Rear870 / 3,480
Dana 44 Rear 1,100 / 3,460
Dana 60, 61-SF Rear 1,500 / 5,500
Dana 60, 61HD-FF Rear 1,500 / 6,000
Dana 70, 70U Rear 2,000 / 8,000
Dana 70 HD Rear 2,000 / 8,800
Dana 80 rear 2,500 / 10,000
Ford 8.8 IFS/IRS 1,250 / 4,600
Ford 7.5 Rear 870 / 3,230
Ford 8.8 (28spline) Rear 1,250 / 4,600
Ford 8.8 (31spline) Rear 1,360 / 5,100
Ford 9.75 SF Rear 1,600 / 6,100
Ford 10.25 FF Rear 2,000 / 8,300
Ford 10.50 FF Rear 2,900 / 10,660
 
#23 ·
With 800hp it seems it would be cheaper to find the traction using 2wd. It seems like you could save a shit ton of weight as well
 
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#24 ·
have you thought about the tcase as well? another weak link in my mind. I know the srt8 jeep guys tend to go 2wd around 800hp because the tcase wont hold the hard launches I also forsee a lot of r&p teeth in the bottom of the diff if you ask me
 
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Discussion starter · #25 ·
ramboy1990 said:
have you thought about the tcase as well? another weak link in my mind. I know the srt8 jeep guys tend to go 2wd around 800hp because the tcase wont hold the hard launches I also forsee a lot of r&p teeth in the bottom of the diff if you ask me
Click to expand...
I'm running an NP273 out of a super duty. It's very stout
 
#29 ·
#37 ·
Take a look at the Strange ProIron cases. I'm not quite at your power level (550whp), but I run a 31 spline Detroit trutrac in my Strange case with 3.90 gears and it hasn't made a peep. a 35 spline case with your choice of diff would handle your power up front with no issues.
 
#38 ·
painlessautoworks said:
Going for something different with my build. A truck with 4 tires rolling smoke is not something you see too often.
Click to expand...
Unless you chain it or block the front bumper you will not spin all 4 tires. Ever.
 
#39 ·
painlessautoworks said:
Stumbled on a handy chart...

8.8 Ford IFS is rated at 1250 continuous & 4600 max torque (comparable to the 9.25" Chevy heavy duty IFS)
Click to expand...
You'll be closer to that than you think when you launch in first gear. What is your first gear ratio? Don't forget about torque multiplication if you're running an auto.
 
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