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Front axle swap?

Discussion in 'Early CJ5 and CJ6 Tech' started by dubc56, Jan 25, 2014.

  1. Jun 1, 2015
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I always assumed the combination of the location of the Ross box, then the drag link, then the bell crank was the major cause of the steering effort required.
     
  2. Jun 1, 2015
    tarry99

    tarry99 Member

    Northern California
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    I would also agree on that...........but once all that junk was gone I never really seen much difference , effort wise when a Manual Saginaw was installed.
     
  3. Jun 1, 2015
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Interesting. I would have thought otherwise. :)
     
  4. Jun 2, 2015
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    I had thought that the recirculating ball design used in the Saginaw steering gear would be both more durable and easier to turn than the Ross gear. I believe the Ross gear is a worm-and-sector or cam-and-peg gear, with higher friction than the recirculating ball.
     
  5. Jun 2, 2015
    tarry99

    tarry99 Member

    Northern California
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    I would have thought that also...........I did 4 installs years ago late 70's early eighties, all Early CJ's with conversions from stock Ross to Saginaw non power on a D-25 or D-27 axles......a pair were 4 bankers , one had a V8 the other was my 65 with a V6......... I had made some pretty nice pieces I made to convert the old stock column over using an oil-lite bushing and new floor plate.......the u-joints at the time were just 7/8" ID PTO type joints........no matter what I tried during that time period and I purposely tried allot ( increased Castor,longer / shorter pittman arm) did the math on the springs , no bump steer , joints and bearings were good in the closed knuckles.........it never seemed to make much difference in the force required department to steer.............noticeably stiff I would say and not much improvement over the Ross at low speed.......driving down the road was no issue, Off road at low speed was a bear along with parallel parking on pavement. All Jeeps had a non stock tire on a 7- 8" wheel and about 9-10" wide tire on 31's.........
    Till this day I could never figure that out............I had mine apart so many times trying new things I should have used zippers, I even looked at many cars and pickups back in the day that had manual gear boxes trying to learn something............I personally think it was the old closed knuckle axle as all my geometry matched the later vehicles.......but I really don't know.
     
  6. Jun 2, 2015
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Mar 4, 2003
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    Well - I have to say that the manual Saginaw steering systems I've put in over the years were worlds better than the Ross we took out. Did these with both the 2 whole knuckle and the single. While the 2 whole was better, both were MUCH better than the Ross - even with smaller steering wheels. Most of these were with 215 or 225 size tires (G and H back in the day)...

    I will say the power is a HUGE improvement over the manual while stopped or aired down, but I'll take a manual Saginaw over a Ross any day.

    BTW - Got a setup on the '49, manual with 31s I'll stack up to a Ross right now...
     
  7. Jun 2, 2015
    Mike C

    Mike C Member

    Austin, TX
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    Feb 19, 2007
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    GM products are mostly the ones with the wider track in the front, but more than anything it is to take advantage of the additional turning afforded by the open knuckle front axle. By making a wider track you can turn the tire further before it contacts the spring. This is also a nice feature of a narrow track 30 swapped into an early jeep as it allows the stops to be set for a tighter turning radius.
     
  8. Jun 2, 2015
    Mike C

    Mike C Member

    Austin, TX
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    Feb 19, 2007
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    I have a '79 CJ5 with 2 1/2" lift and 33 12.5 15 on 10" rims and it is manual Saginaw equipped. It is not hard steering at all compared to the Ross. When I had it inspected the state guy said it was borderline play for a power setup and I pointed out it was manual...it turns that easy. Certainly won't make that mistake with the Ross.

    On my '79 the real issue is it's just not fast enough. With a locked rear and a 360 you can't turn the wheel fast enough to save it when the back steps out. A power box is in the near (very!) future.
     
  9. Jun 2, 2015
    dubc56

    dubc56 Member

    Illinois
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    May 7, 2013
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    Well, i found a manual box on CL today. I was pumped to go get it. It wasn't locked up or anything so I says sure $40 bucks.

    I guess you get what you pay for http://i1060.photobucket.com/albums...1-31F9-4AC2-AF85-E91890E52075_zpsfaykhzaj.jpg

    From what I read, it is rebuildable for not terribly much. The spud shaft from advanced is like $105 though.

    I do have this PS laying around though I think it's from a mid 60's car. http://i1060.photobucket.com/albums...D-A393-4647-BE6C-F8F765A03009_zpsbnlqo0gn.jpg I can probably offset the price of rebuilding the manual box by kicking this one down the road.

    Every new post really gives me more to think about, that's for sure.
     
  10. Jun 3, 2015
    4x4Dad

    4x4Dad New Member

    Yorba Linda, CA
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    Jul 19, 2013
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    12
    Soak the rusted shaft end in CLR for a while, and scrub at it. I bet it's not an issue at all and won't need replacing. But then, I'm an optimist.
     
  11. Jun 3, 2015
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    USA
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    I think the shaft is fine, i am also an optimist. I got a rebuilt saginaw power box off amazon for around 100 bucks shipped to my house. Works great. If you were closer I have a used power box and unopened rebuild kit i would give to you free.
     
  12. Jun 3, 2015
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
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    3,437
    I looked at that shaft, it should clean up easily. A stiff wire brush after cleaning should dress it up.
    If the box isn't satisfactory, use it as a core and get a rebuilt one from Lares corp.
    Good rebuilder; you can order through Advance Auto, etc.

    http://www.larescorp.com/

    Enter the year/model rig you want the box from, say 1972 Jeep CJ5.
    You'll get options for manual and power, you'll get "rockcrawler" option (rebuilt with heavy-duty components), and you may even get a "new" (vs. rebuilt) option.
    I've used a couple Lares rebuilds; excellent quality, superior to the cheaper ones that auto parts stores offer.



    Oh and I ran an NT D30, swapped it in to my '71. Loved it!! I did not add spacers to the rear D44; I allowed the tracks to be slightly different. There was some advantage offroad.
    Plan on using some steel caster angle shims to restore caster. After my swap, the rig was undriveable over 35 mph, couldn't keep it between the lines. Took it to a shop, found that caster was .9 !! Spec is 5° to 7° positive. I obtained some 5° shims, placed them between the perch and the spring... steering was perfect after that... tracked straight and true through 75 mph.
    Here's a place for spring shims:
    http://www.4crawler.com/4x4/ForSale/Shims.shtml

    I believe our forum member mcruff has also custom made spring shims for members in the past. He can also make steering gear mounting plates, spud shafts, etc... he's our resident master machinist! If you are in need of these items and want superior quality stuff, check with him and see if he is still making components. :)

    Also note that post-1971 spring mounting plates will mount the bottom of the shock behind the axle. Pre-72, on the D27, the shock was mounted in front of the axle.
    IIRC, the axle tube is somewhat larger in diameter on the D30 than on the D27, so typically one buys larger u-bolts and D30 spring plates to match the slightly larger u-bolt hole pattern. Then you have some choices. You can modify the hole pattern on the D27 plates, keeping the shock in front of the axle, or modify the lower shock mount point on the D30 plates to keep the shock in front of the axle. Or move the upper shock mount on the frame to match the behind-the-axle configuration of the D30 spring plate. I chose to keep my upper shock mount in the factory in-front-of-axle position, because moving it to accommodate behind-the-axle involved moving brake lineswthat I didn't want to do.

    I bought JKS B2 spring skid plates. These are designed for behind the axle shock mount. However there was plenty of stock available in the massive plate to drill and tap a hole in the other end, to thread in the lower shock mount stud. I did that, and simply put a bolt in the now unused threaded hole on the other end of the plate.
    I've seen other plates such as Warrior products (IIRC) and even stock D30 plates where you can cut off the lower shock stud and reposition/reweld it, or weld a new lower shock stud on.

    [​IMG]

    [​IMG]

    (Pics also show the fat end of the spring shim)

    It's been quite some time since I did this work; as best I can recall these are some of the details you'll run in to as you continue with the D30 swap, that I didn't see previously mentioned.
    Even with these additional challenges, a D30 swap/saginaw steering is one of the best things you can do to a pre-'72 CJ.
    Good luck!! :tea:
     
    Last edited: Jun 3, 2015
  13. Jun 3, 2015
    dubc56

    dubc56 Member

    Illinois
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    Hindsight....maybe I should not be allowed to play with the big kids. Haha

    There was so much rust buildup I thought the shaft was chipped out not just keyed. :oops: I cleaned it up a bit and I'm sure it's perfectly OK. I'll soak it and it should be good to go. Livin' and learnin' they say.

    Lynn - thanks for posting those pictures and the insight on the shims and skid plates! One would assume the placement of that front shock would make a difference in the ride?
     
  14. Jun 4, 2015
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Just emailed you some pics as well of both power and manual installs, D25 and D30. I too use McRuff's spud shafts and mounts when I can get them from him. Worth the ping to him and see if he has any or would be willing to make you one.
     
  15. Jun 4, 2015
    dubc56

    dubc56 Member

    Illinois
    Joined:
    May 7, 2013
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    125
    Thanks Chuck! I'll wait to get them check those out. I do appreciate it.

    I'll get everything together and mocked up before I lock down what I need. Shafts, mounts, shims etc and then start bugging McRuff. :)

    I feel like things are moving along well. Almost too well, if you guys know the feeling!
     
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