1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

need some help from more experts

Discussion in 'Builds and Fabricators Forum' started by tomatolane, Jul 22, 2013.

  1. Jul 22, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Ok by now most know,I put the fat motor in the jeep.

    My only real word experience, with rear ends have been , my 1976 bronco had the 9 rear and 44 front, and my small block jeep also had 9 rear and 44 front.

    I have zero experience with any jeep dana 44, rear end. but love the off set.

    I only have experience with dana 44 fronts , and both fronts where modified bronco dana 44s axles.

    The rear end in the jeep now is the off set flanged 30 spline rear end.I have read this is a good strong rear end.Is it as strong as a bronco front dana 44?

    I will run 33 inch tires, and 34 inch paddle tires(but they are very light only 38 pounds with out the rim) .

    How much can a 30 spline rear end handle?

    I never had a problem, with my dana 44 front axles, but i also never ran taller then 31 inch tires on those axles.

    do you guys think I should just beef up the 44 or dont waste the money on that , and just have A 9 inch built, or a dana,60,, or 12 bolt?

    Now i understand all of them built right can take plenty of power.

    So which would you build for your jeep.

    I like the off set rear end, ( you know keep the rocks under your seat) for better ground clearance, so any rear end I have built will be off set.

    So upgrade the 44 ?

    Or?
     
    Last edited: Jul 22, 2013
  2. Jul 23, 2013
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
    Joined:
    Jan 15, 2011
    Messages:
    2,115
    I'M running a center dana 44 on the rear of my cj5 with 36" tsl i did a lincoln locker on it, i'm a little hard on the pedal and it's holding. The dana is 30 spline and is stock exact about the lincoln locker.

    A ford 9" will be way stronger than a dana 44, drag pilot use them a lot because they can handle lot of power. But the pignon on the ford 9" is lover than the dana 44.
     
  3. Jul 23, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Hey thanks johneyman.

    So you would vote 9 inch?
     
  4. Jul 23, 2013
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
    Joined:
    Jan 15, 2011
    Messages:
    2,115
    It depend on what you're planning for and how much Hp the axle will have to take. Like a said i run a scout dana 44 in the rear with 36" tsl, i did run them on snow, mud, rock and i'm hard on the pedal and everything is holding. On 33" i won't be afraid to go with the dana 44. I know a guy who put a ford 9" under is TJ and he broke the pignion twice but he's not friendly with the gaz pedal.
     
  5. Jul 23, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Well according to the 1/8 mile et mile per hour and weight , its around 500 rear wheel hp, and 600 to 635 ft pounds of torque.

    My small block was only 400 hp and 425 torque.

    Most guys at the track with similar hp/tq rating , most run dana 60s and 9 inch, and some 12 bolts.

    The only dana 44s i see are in the corvettes .and none of those where over 600 foot pounds.

    And yeah I have seen a dana 60 , on a vega wagon, with only 460 hp with 17 inch slick, grenade.

    Mind you I am not expecting bullet proof, I just dont want to blip the throttle , and fling the rear end guts all over the car behind me at the light LOL :)
     
  6. Jul 23, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    And hey johnny, I wont be doing any crazy rock crawls like you.

    I will be mostly messing around in dirt/drymud, (no deep pits ) and the beach,and sand tracks, but may take to gravelrama, and will do the flat drags, uphill drags, and obstacle course, and the few rod runs around here.

    And it weighs 2800 pounds.

    If that helps out with your thoughts.
     
  7. Jul 23, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    And to add.

    Most of the pro guys run quick change rear ends, and basicly a single speed tranny if they have reverse, but most dont and use a setup like sprint cars no tranny just strait off the crank

    Tho I would love a quick change rear end:)
     
  8. Jul 23, 2013
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
    Joined:
    Jan 15, 2011
    Messages:
    2,115
    Hum, i'll go with the 9" at you're place, they handle lot of power. And 9 inch are easier to find than a offset dana 44
     
  9. Aug 10, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Which is better 28 spline 9 inch or dana 44 30 spline.

    I can get the 28 spline 9 inch for cheap its already narrowed to 49 inches new brakes and the gear I want.

    Or should I pass and keep looking for 31 spline 9 inch?
     
  10. Aug 10, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    You can swap the 9" to 31 spline, but requires new axles as well. Plus the lower drive pinion that can be problematic for driveline/u-joint angles.
    I prefer the 44 but an offset 44 with flanged axles can be difficult to find. The 9", depending on price and the quality of narrowing, could be a very good deal. Just keep in mind the potential u-joint angle issue.


    Sent from my iPhone
     
  11. Aug 11, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Hey nick what can you tell me about a 1975 Dana 44 is it stronger then a offset Dana 44?

    mine is a 1971 offset flanged Dana 44

    Or are they the same just one is offset and one is centered?
     
  12. Aug 11, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    The reason I ask is I can get a dana 44 rear and dana 30 front from a 1975 for 200 bucks.

    Is that a good price?
     
  13. Aug 11, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    There is no strength difference between an offset flanged 30 spline 44 and a centered 30 spline flanged 44. If you already have the flanged offset 44 I would stuck with that if It matches the transfer case you intend on using. The 9" will not really be an upgrade.
    The 30 and matching centered 44 for $200 is a great deal in my area. Not sure about yours. Condition weighs in a lot as do gear ratios as well.



    Sent from my iPhone
     
  14. Aug 12, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Hey nick how do you think the Dana 44 will hold up with 31 inch tires, 3.73 gear and 550 foot pounds of torque?

    I have seen some dana 44 front end hold up to some big torque numbers, with 33s and 35s,

    But i dont know enough about axles, to know if the Dana 44 front found in trucks are the same as Dana 44 rears found in our little jeeps.

    How do they compare? if they are basically the same strength, then I am not so worried, like i said , I have seen some dana 44 fronts take some abuse ;)
     
  15. Aug 12, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    Is this 4 wheel drive? Will it be used primarily on loose surfaces or asphalt/hard pack?
    Remember, a front axle receives 1/2 the torque as it is divided between the front and rear axles by the transfer case.


    Sent from my iPhone
     
  16. Aug 12, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Hey nick it will mostly be rod runs/ cruise/ nights.

    But hard runs will be mostly 300 foot sand tracks, and dirt/shallow mud tracks.

    I am not a rock crawler or a deep mud pit kind of guy.

    But I do like running dirt courses/up hill climbs/up hill drags/and flat drags.

    I might go back to the 1/8 some times, but will never run a slick , I would run my mickey baja hps. And usually just a Friday night grudge night, or if pinks all out comes to town I may run it harder :)

    Would love to get the jeep on pinks for us jeep guys :)

    But since I am moving to tenn. I will mostly do sand and dirt tracks.


    4x4

    I had a chain drive in at first , but I am having to go back to a enclosed style transfer case to stay is super street class.

    So ATM my rear end/front end/ and transfer case will be what ever I need to get ,it to hold up that fall under the rules.

    The transfer case(the case itself) has to be enclosed (not stock like I thought), but can be chain driven , just cant be open chain drive.

    Since i miss understood the rule LOL And

    Now that I sold my chain drive I am kicking myself in the butt, Because all i had to do, was to enclose the chain drive :( .

    So transfer case will be custom , made by power pro.

    Long story short yes it will still be 4x4.

    What do you think about 12 bolt rear ends? I have seen those take a pounding with 4 speeds dumping the clutch, in heavy chevelles...??

    My class states stock location , and has to be production, only narrowing/widening and after market axles mods are allowed, and has to have been in production any make, in the year of the vehicle.

    so 1971 and older.
     
    Last edited: Aug 12, 2013
  17. Aug 12, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    I'd run the 44 but would consider some aftermarket shafts from One of the suppliers if you have issues. On loose sand/dirt the 30 spline holds up quite well. I ran a stock Scout 2 dana 44 with a spool in the race Jeep with a 13 1/2 comp ratio 4.3 with no problems doing sand/mud drags and wheel to wheel racing. Before that engine I ran a 11 1/2-1 comp ratio seriously pumped up 225 V-6 with never an issue. Both engines I ran a BW super T-10 and was not gentle. The 225 I was running 6.8 second 100 yard on basically bald tires (budget was thin)
    The 12 bolt is ok but again, you're not gaining much if anything over your flanged 44 other than spending a bunch of money. If you start having issues with the 44 then Just build a 35 spline Dana 60 and be done.
    I just hate to see people spend a ton of money to modify a diff when they really aren't gaining much. There are companies that can build stronger axle shafts for your 44 if you need to upgrade. If you want disc brakes, there is a bolt on kit for that too. The beauty about the 44 is any locker, limited slip, spool, gear ratio, etc is pretty much available. Most everyone stocks parts for them as well.

    Sent from my iPhone
     
    Last edited: Aug 12, 2013
  18. Aug 13, 2013
    tomatolane

    tomatolane Lane

    Chattanooga...
    Joined:
    Sep 3, 2012
    Messages:
    465
    Thanks for the uber advice/info.

    I always look forward to your tutelage :)

    I think I will do just that run the 44 and up grade axles.

    Thanks again man .
     
  19. Aug 14, 2013
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
    Messages:
    4,459
    If he is running at the track with sticky tires, even if it was in 4x4 mode, almost all the stress will remain on the rear axle-the front end is going to be pretty light. I would be building a 9" but there wouldn't likely be any Ford parts in it and it would be full float. Currie time. D60's, IMO, are just to damn big and heavy.
     
  20. Aug 14, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    That's my point, the front ends hold up very well to larger tires, more hp, and more torque because the torque is halved going to the front, I.e much less stress on the front end in four wheel drive than a rear end in two wheel drive.
    The right Dana 60 can be built pretty light and strong. Not as light as a 9" but still pretty light. A lot cheaper than a 9" too.



    Sent from my iPhone
     
New Posts