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Thread: 35 Spline D44 Vs SF60?

  1. #11
    Been Around the Block Braxtonsag's Avatar
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    Quote Originally Posted by jorgelrod View Post
    If you see Eddies video of him running 40’s on a 35 spline 44, he grenaded his ring and pinion, not his shafts which is most likely what will happen even with a light foot under the right conditions...


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    Yeah Iv seen it and taken it into consideration for a really long time actually. The reality is I almost never get on trails that hard. I’m able to go play out west once a year. Another thing I’ve taken into consideration with that is that Eddie has stated moby weighs around 7000lbs. That’s a TON of weight for an axle to deal with. Now my jk isn’t anorexic but last I had it on the scale it weighed 4520 and that was with heavier wheels, tires, and bumper than it has now.

    I’m not really saying that’s a huge difference, but it’s still 2500lbs less.

    Another thing is he was running 5.38s if I remember right, I’m currently on 4.88s and would probably only jump up to 5.13 if I felt like it absolutely needed it. I hated my 4.88s on 37s. It felt way over geared and I was cruising above 3k on the highway. The 4.88s seem perfect with the 38s right now so I couldn’t imagine bumping above 5.13 for 40s.

    If I do end up breaking a r&p, I have a brand new one on the shelf with master kit from when I bought the pro rock so itl be a lesson learned. The general consensus here is to stay away from the sf 60 though. Might just leave it alone until it gives me an issue and go from there.
    Last edited by Braxtonsag; 09-24-2019 at 02:27 AM.

  2. #12
    Hooked KevinG's Avatar
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    I think (not 100% sure so take it for what it is), that you are thinking of what moby weighs now. I am totally going to guess out of my ass, but I think the V8 adds at least 300 to 400 lbs. I have no idea how much more a PR60 front and a PR80 weighs, but it's going to be a significant difference. I think the PR44 is more than 50lbs heavier than a stock 44, so I am guessing just the 60 is probably closer to 100 lbs. The 80 has to weigh quite a bit more than a rear 44. etc. etc. etc. All of that aside, the unsprung weight is compounded when moving and the footprint is way bigger. Plus, you need to get everything pushed way out further or else you aren't going to be able to turn it. Spacers on 40's?
    If you're hell bent on running 40's, go for it! Like I said, I would love to do it, but watching the end of that video, it doesn't look like much fun to have to rip out my diff's intestines and crawl out of wherever in front wheel drive like a honda. I end up on the trail a lot by myself and chances are if I tried it I would be by myself.
    You mentioned that part of the reason that you are thinking about them is for a nicer ride over fist sized boulders, right? What do you air down to?

  3. #13
    Nothing but a Thing desertrunner's Avatar
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    I'm in agreement with all the stuff posted above but I'll throw in my 2 cents. I went through the same thing when I upgraded my axles. I ultimately went with the trail leader package. Part of my decision was based on not planning on bigger than 37s for a while and going 4.88s due to R&P considerations. At the time it was also nice to keep the stock rear driveshaft (ended up buying a 1350 later anyways but it was money saving for initial purchase). As mentioned above the the only real benefit you get with the SF60 is the R&P size which is confidence when going with 5.13 or bigger. Still can bend flanges same as a 35 spline upgrade. 5.13s in my opinion is kinda the tipping point for a 44 you can definitely grenade a set of gears with that combo in a 44 depending on how you drive. So I wouldn't completely say a SF60 is a waste of money if you are looking for added confidence in your R&P, especially if your wanting to go 40s. Obviously the best option for full confidence in the rear is FF but based on what you have described I think you will be fine with a 35 spline upgrade on the 44.

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  4. #14
    Addict Ddays's Avatar
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    Something else to consider is to run the FF60 rear in a 5x5.5 wheel pattern and use adapters or do a Spyntec hub conversion up front. Teraflex also makes an 8x6.5 front hub conversion kit

  5. #15
    Nothing but a Thing jorgelrod's Avatar
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    Quote Originally Posted by Ddays View Post
    Something else to consider is to run the FF60 rear in a 5x5.5 wheel pattern and use adapters or do a Spyntec hub conversion up front. Teraflex also makes an 8x6.5 front hub conversion kit
    I won't lie, I've seriously considered these, mostly because I'm not sure how much I might get from trying to sell my PR44 to start over.


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  6. #16
    Addict Ddays's Avatar
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    Quote Originally Posted by jorgelrod View Post
    I won't lie, I've seriously considered these, mostly because I'm not sure how much I might get from trying to sell my PR44 to start over.


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    Couple members here have run the Spyntec hubs with good success and I really like the option of having lockout hubs. I'm going with the Teraflex 8x6.5 kit ( I know, I know ) based on advice from Fusion and Bubba - both recommended the Teraflex kit over the Spyntec.
    If my PR44 front shits the bed with this combo ( I think it will be just fine with 37's) I'll spring for the 60 front. But honestly, with the FF60 rear and the PR44 up front, I should be set.

    Edit: Another consideration that sways me to the TF kit is if I would eventually go to a 60 front, I would already have the 8x6.5 wheels. To the best of my knowledge, I don't think anyone offers a front 60 with a 5x5.5 bolt pattern. I only want to buy one more set of wheels. My shed & garage are starting to look like a wheel & tire shop
    Last edited by Ddays; 09-24-2019 at 12:56 PM.

  7. #17
    Meme King WJCO's Avatar
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    Quote Originally Posted by Ddays View Post
    I'm going with the Teraflex 8x6.5 kit ( I know, I know )
    Might have to move this over to the infirmary.
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  8. #18
    Addict Ddays's Avatar
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    Quote Originally Posted by WJCO View Post
    Might have to move this over to the infirmary.


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  9. #19
    Old Timer fiend's Avatar
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    Quote Originally Posted by Ddays View Post
    Couple members here have run the Spyntec hubs with good success and I really like the option of having lockout hubs. I'm going with the Teraflex 8x6.5 kit ( I know, I know ) based on advice from Fusion and Bubba - both recommended the Teraflex kit over the Spyntec.
    If my PR44 front shits the bed with this combo ( I think it will be just fine with 37's) I'll spring for the 60 front. But honestly, with the FF60 rear and the PR44 up front, I should be set.

    Edit: Another consideration that sways me to the TF kit is if I would eventually go to a 60 front, I would already have the 8x6.5 wheels. To the best of my knowledge, I don't think anyone offers a front 60 with a 5x5.5 bolt pattern. I only want to buy one more set of wheels. My shed & garage are starting to look like a wheel & tire shop
    You just have to come back and tell us how great everything Teraflex is.

    What FF are you going with? CRD60? That’d match the front.


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  10. #20
    Advertiser Exodus Jeeps's Avatar
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    Quote Originally Posted by KevinG View Post
    I think the V8 adds at least 300 to 400 lbs.
    Negative. The aluminum block LS weight difference vs stock is negligible.


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