i would vote for a ford 9" parts for them are cheaper and you can really beef them up pretty good... unless your running some serious torque you will be fine
I dont like the idea of running any HP application in the rear. I know of a guy running HP60's and breaking the ring gears like nothing.
The rear 9 is good for up to about 36's on 35 spline for a stock modified rig. A FF60 running 35 spline is good for about 40's on a stock mod rig. The buggy relm is a different animal.
They both cost about the same to build up to those specs. But there is SOOOO Much more to take into account. What is your t-case gearing? Auto or manual? lowest gear in tranny? Any range boxes? What is your torque multiplyer at the axle under most extreme conditons?
Given you want 35's, you should be fine with a 9" on 1.5" 35 spline.
The hp doesn't really give ya any more clearance under the housing but it does raise the driveshaft up out of the rocks and give ya a better driveline angle (of course it is weaker in the rear). The only problem with a 9" is the low driveshaft input but it is strong, light and findable in 5x5.5 for your cj. If ya like ff and 8 lug go with the 60. A 14 bolt is kinda big for 33s or even 35s.
As mentioned above it sounds like the 9" would be a better bet. They are much lighter than a 60 and should be strong enough. I did not read anywhere if price was an issue, just that you could get either for around the same price. If price is really not an issue, or you have a spare you can throw in while saving some coin then you could always go with something like a spider 9. That would give you the strength, keep the weight down and you can get it with the TrueHi 9 third member to help with the driveshaft angle and to keep the shaft out of the rocks. Good luck with the swap.
Just a question: Why did Ford offer the 9" on the 1/2 ton truck, yet used the D60 in the 3/4 ton? Surely they did not buy an out-of-house axle that was weaker to place into a higher-demand position?
FF60 carries the full weight of the rig on the spindles, so the only duty the axle does is turn the wheels v.s. semi float: the axle carries the weight AND turns the wheels
I think it unanimous! The Ford 9" sounds like the way to go.
Now, since I am looking at this. I understand that you are not supposed to run a TruHi9 or Currie HP on the rear. But...Since I have small little tires compared to the Big boys a HP should be fine right.
For the sake of argument.....are you sure you are gonna stick with a 35" tire and go no larger? I blew up a 9" on 33s in an old 79 bronco once, it was a "FREAK" thing but it did happen. I would run a 9" everyday of the week if i knew i was gonna stick with a 35" tire, but if you even considered once going a little larger, id probably lean towards a 60.
I'm sure ALOT of guys will relate to this...
When i was on 33s I convinced myself i could just have fun on stock axles and I did fine....i wanted more. I "needed" to go to 35"s, and lockers, I wheeled like a saint, did alot of crazy shit i wasn't supposed to and swore this was as far as i needed to go. Now I have D44s, 4:1 kit, and 37" tires, and guess what.....I want more. :flipoff2: The axle options are getting more and more limited, cash that i threw into stock axles, D44 Axles could have easily built a set of 60s that could handle a 40+ tire which is where i think i want to go now. All I'm trying to say is sit down and think it out well and if theres even the smallest possibility that you want to go larger in the end, it might be worth it to pony up for the D60 now. Good Luck with whatever you decide.
This man speaks the truth! I built the stock axles...fine I'm done. I built front and rear D44's..fine I'm done. It currently sits on fullwidth 60's and 42's...fine I'm done. next stop rockwells?
Put a 60 in it. I wheeled with a 60 and 35 inch tires for a while. The ground clearence isn't great BUT WHEN YOU WANT BIGGER (and you will) the rear axle is taken care of. Go 60 now and you won't rgret it ever.
I agree: If you are swapping an axle, do it 1 time. Go with the stronger D60 and then you won't be re-doing it 2 years from now.
I guess my questions arose over stuff i hear regularly & that link provided. To me, there is no comaparison between the 9" and the D60 & D70 they compared it to. I know from drag racing that a D60 SF ( What I ran in a 9 second 'cuda ) was cheaper than a 9". Price a nodular case, stronger pinion support, etc.....
I know from drag racing that a D60 SF ( What I ran in a 9 second 'cuda ) was cheaper than a 9". Price a nodular case, stronger pinion support, etc.....
but in drag racing thats a lot of easily shed-able weight... youve spent all that money for a 9 second car and the easy weight shavings isnt worth it? :shrug:
if it were mine and I never planned on going to larger than 35s, I would do the 9inch. Not for absolute strength (the 60 wins in the dept hands down) but rather for ground clearance. Just be prepared for rear driveshafts issues unless you pony up for a High9. DO NOT do the Currie unit- it uses 8.8 gears and you can break it with a stock 6 cylinder. The True Hi9 is the chunk of choice.
While the D60 and 9" are strong enough for the tire size you are planning, you really need to plan ahead more. What about 6 months from now when you feel the urge for 44"s?
...I think what would be BEST for you is to buy my Rockwells, and then you will be set for strength and gearing for...well, a really frickin' long time!
J/k...I would feel bad if someone planning on 35's bought these beasts!!
i have a very similar setup to you. My Currie 9 inch works amazing with 35's and i doubt it will break under a 258(mines heavily mod'ed tho). Dont go with the HP, the LP works just fine, i am actually getting better ground clearence than my old Model 20. I would try to go to Currie for everything, the housing, shafts , etc.. i have had great luck with mine so far..
cuz on 33's he would drag it all over the place. no reasone to do it. i know he can trim it but its still unnesesary weight. all true even if he was doin 35's. id say 9" all the way. id do a spidertrax if you say youve saved the pennies.
baylen
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