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Thread: Some interesting axle strength calculations

  1. #101
    turbo addict Turbo Mopar Contributor
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    Re: Some interesting axle strength calculations

    So what I am getting from this is the early style 31te style driver side carrier doesn't have enough depth for the fitzall roller seal but the late a523 does.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  2. #102

    Re: Some interesting axle strength calculations

    Quote Originally Posted by Ondonti View Post
    So what I am getting from this is the early style 31te style driver side carrier doesn't have enough depth for the fitzall roller seal but the late a523 does.
    ?? No, I was measuring the early pre 95 A413 and post 95 A413 automatic trans. Early will work, late will not work.
    Acannell is measuring a manual trans. 523 model.
    best 1/8 ET-6.16 sec. best 1/8 speed-119.70 Best 1/4 MPH 145.5, Best 1/4 ET 9.65 sec. 8 valve NO NITROUS!!

  3. #103
    turbo addict Turbo Mopar Contributor
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    Re: Some interesting axle strength calculations

    Quote Originally Posted by Warren Stramer View Post
    ?? No, I was measuring the early pre 95 A413 and post 95 A413 automatic trans. Early will work, late will not work.
    Acannell is measuring a manual trans. 523 model.
    Well then if you needed to run a large bearing diff, Carlos showed that there is enough meet to machine out and install the large race into the old 5 speeds. I would think this would work with a413's

    I say 31te since there are many varieties with similar guts. I do a670's :P
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  4. #104

    Re: Some interesting axle strength calculations

    Good idea, I will check that out see if it could be done to a 413.
    best 1/8 ET-6.16 sec. best 1/8 speed-119.70 Best 1/4 MPH 145.5, Best 1/4 ET 9.65 sec. 8 valve NO NITROUS!!

  5. #105

    Re: Some interesting axle strength calculations

    Quote Originally Posted by Warren Stramer View Post
    Ok, New spline configuration, Widened the undercut, polished the area to mirror finish and shot peened it.
    I am very impressed by what Lengel built for axle assemblies, and would love to have those, But almost without exception, I usually twist the splines off on the inner left side, and I don't see how He addressed that problem. I guess I should re-read his thread.
    I honestly have my doubts that undercutting and shot blasting this stock axle will help much but it cost nothing but my time, and I did the same treatment to my stock trans. input shaft and have never broke it where most other high power autos have. (knocks on wood)

    I will report back when it breaks.
    Following up on the axle mod. since I modified my left side (short) axle I have put about 50 runs on it with NO failures, and no stress cracks forming so far. I pull the left side axle after every race for magnified inspection and it shows no sign of twist.

    That is with 60fts. in the 1.58-mostly low to mid 1.6's...……..Knock on wood
    Attached Images Attached Images   
    best 1/8 ET-6.16 sec. best 1/8 speed-119.70 Best 1/4 MPH 145.5, Best 1/4 ET 9.65 sec. 8 valve NO NITROUS!!

  6. #106
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    Re: Some interesting axle strength calculations

    Very nice! What's the vehicle weight and estimated engine torque now?

  7. #107

    Re: Some interesting axle strength calculations

    Just weighed it at Brainerd, 2365 with me in the car. Have no idea about the torque estimate, never been on a dyno.
    best 1/8 ET-6.16 sec. best 1/8 speed-119.70 Best 1/4 MPH 145.5, Best 1/4 ET 9.65 sec. 8 valve NO NITROUS!!

  8. #108
    Supporting Member II Turbo Mopar Contributor Shadow's Avatar
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    Re: Some interesting axle strength calculations

    Great news on the dressed stock axles! Gotta be in the 500+ WTQ range I would think, albeit, at a higher RPM than any other 8v I'm aware of.

    Robert Mclellan
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  9. #109
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    Re: Some interesting axle strength calculations


  10. #110
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    Re: Some interesting axle strength calculations

    thinkin'.. when you finish fishing all those little roller bearings .. or whatever's left of them , outta your diff .. then the opportunity to spend LOTS of cash opens up...

    I'd like to see one of those with 50-80 000 consumer miles on it first..

    I broke the tip off the bolt that fits in the shift fork rod in my 555 once.. threads into the fork .. tip fits in hole in rod to keep fork in place..
    needed mod .. better bolt and thread the hole in the rod so the tip can't drop out the bottom IF you break the bolt

    tip of the bolt bounced along the gearset until it got to the pinion & ring gear.. then it cracked the case at the secondary shaft bearing as it went through..

    I picked out something that looked like a wad of old gum off the bottom of a school desk..

    stupid stupid reason for a completely fubar transmission..

    lol.. I managed to continue to drive that .. with oil top ups for 5 more days .. lose shifter fork on rod & all.. no real drivabality issues as long as I shifted 3 & 4 REALLY SLOWLY ...

    so neon/hurst shifter with stops for my 568 style trans .. check..

    looking at the link , to the right of the page there seems to be possibly a nice Porsche axle .. I wonder what else they might be able to make / supply .. ????
    Last edited by Dr. Johny Dodge; 01-28-2021 at 07:11 AM.

  11. #111
    Supporting Member II Turbo Mopar Contributor ajakeski's Avatar
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    Re: Some interesting axle strength calculations

    Those seals with the helper bearing don’t last long. I’ve seen them fail in as little as 500 miles.
    They were supposed to help stabilize the axle on transmissions with worn diff bearings. They don’t.

  12. #112
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    Re: Some interesting axle strength calculations

    But what if the bearing AREN'T worn and you are using them to keep the axle centered better. Those little bushings don't do a great job.

  13. #113
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    Re: Some interesting axle strength calculations

    but the bushings stay pressed in place .. trust me ya don't wanna run over speed bumps ..INSIDE the trans

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