A518 Overdrive Questions

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    Author Topic: A518 Overdrive Questions  (Read 148446 times)

    Offline Katfish

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    • 70 Challenger
    Re: A518 Overdrive Questions
    « Reply #315 on: March 31, 2012 - 07:02:25 PM »
    Got any pics of the process or the finished result?
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    Offline Cuda54

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    Re: A518 Overdrive Questions
    « Reply #316 on: March 31, 2012 - 10:50:47 PM »
    I was told it would not hold up to a 525hp big block. When I had my trans redone that the A518 was only good up to about 450hp. Anyone go that high or higher?
    « Last Edit: March 31, 2012 - 11:22:02 PM by Cuda54 »
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    Offline PlumCrazyChris

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      • Mopar Muscle Cars of Austin
    Re: A518 Overdrive Questions
    « Reply #317 on: April 01, 2012 - 12:21:20 AM »
    It can hold up to whatever a 727 can hold up to.  I don't suppose you'd have it locked in OD if you had it floored, so it really doesn't matter.  The OD is just for cruising.  It will drop back down to 3rd if you step on it. 

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    PlumCrazyChris
    Mopar Muscle Cars of Austin
    Round Rock Tx
    70 Challenger 5.7, A518, A/C
    70 Challenger 340 convertible (Gone to Sweden)
    68 Barracuda (sold it too)
    www.mopar.org

    Offline Cuda54

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    Re: A518 Overdrive Questions
    « Reply #318 on: April 01, 2012 - 04:36:59 AM »
    The way he made it sound the clutches would not hold up. And it would burn up the bands and clutches. And just bust parts inside in the lower gears not OD. Just what the shop owner told me so that is why I stayed with the 727.
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    Offline tactransman

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    • 1973 Challenger- Member here since April 14, 2006
    Re: A518 Overdrive Questions
    « Reply #319 on: April 01, 2012 - 09:48:59 AM »
    The 518 can be very easily built to 618 "specs". The only thing that cannot be changed to 618 specs is the later wider reverse band(case design prohibits). The 618 is put behind the Cummins diesel which can be "chipped" to 600-750 ft lbs of torque. So yes a 518 can handle anything you throw at it.
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    Terry-tactransman 
    Torqueflite/Automatic Transmission Specialist
    Union, Mo.
    Give a man a fish and he eats for a day,teach him to fish and he eats for a lifetime.

    Offline ntstlgl1970

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    Re: A518 Overdrive Questions
    « Reply #320 on: April 01, 2012 - 11:52:35 AM »
    Go to the tcsproducts.com website. You can add more clutches, replace drums and so on with 727 stuff to handle whatever you want. It will never be as "fast" as a 727 since you have to spin up the heavy overdrive assembly.
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    70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....

    Offline ntstlgl1970

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    Re: A518 Overdrive Questions
    « Reply #321 on: April 01, 2012 - 10:18:30 PM »
    Quote from: Katfish on March 31, 2012 - 07:02:25 PM
    Got any pics of the process or the finished result?

    I can't find any other pictures than this one. I took the stock crossmember, cut off the "ears" that the chrysler trans mount bolts to flush. Then I slotted the boxed portion of the crossmember to make it flatter - stock the part that makes up the inner part of the crossmember is at an angle. Hammered the inner part of the boxed portion to make it more square and "thinner" in profile. Cut off any excess and welded the boxed portion together. Then I cut the "arms" of the crossmember to match the enlarged tunnel opening in my car. Then I ovaled the mounting tabs on a gm biscuit trans mount from energy suspension that you can get at autozone or wherever, bolted a flat piece of stock to it (the new bracket portion of the crossmember) then made all that match up to the crossmember and added some extra gusseting with the triangle portions to strengthen the mount area of the crossmember. I did all of this when my engine and trans were still mocked up on the engine run in cart I built. I got all the engine angles with the 727 and stock crossmember, installed the 618 and built the crossmember to bring the angles back to being the same as before. Sounds really complicated but I don't think it took longer that 2 hours start to finish to modify the crossmember. Fitting the trans in the car is a whole other story....

    « Last Edit: April 01, 2012 - 10:20:24 PM by ntstlgl1970 »
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    70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....

    Offline 360FISH

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    • BS23H3B567746
    Re: A518 Overdrive Questions
    « Reply #322 on: April 04, 2012 - 02:19:03 AM »
    Quote from: rockymopar on February 16, 2012 - 11:07:52 PM
    <snip>...  Presently, you have to fab your own crossmember. I am trying to deal with us all the 5 speed conversion dealers as I think their crossmembers may be adaptable to the 518. I made my own out of scap steel, and it still looks like scrap
    The guys at US Car Tool just sent me an email saying they would make one for $250 basd on the conversion they did on a Challenger.   One day after I sent my templates to a local guy...  oh well, maybe this will help someone.  :)
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    1973 ‘Cuda   Semi-Pro Touring
    360 SB - 518/OD auto tranny - FAST EZ EFI - Edelbrock Fuel sump - HHR fan
    Hella H4 headlights on relays - 97 Dodge Avenger seats - Chin spoiler - Bumpers pulled in to ’72 offset

    Build: http://www.cuda-challenger.com/cc/index.php?topic=74674.0

    Offline PlumCrazyChris

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      • Mopar Muscle Cars of Austin
    Re: A518 Overdrive Questions
    « Reply #323 on: November 05, 2012 - 04:07:12 PM »
    Quote from: Katfish on March 31, 2012 - 12:44:25 PM
    Ok PlumCrazy, I'm right behind you.

    Make sure you take tons of pics and document every step.  Seems like we need a vendor to step up and put together a kit, or at least the tranny support.

    I have mine installed now.  I went ahead and made a template out of cardboard, then transferred that to some 1/8" plate I had and took it to this guy with a waterjet CNC.  He fixed it up in CAD and cut it out for me.  It turned out great!  Its all one piece so I could take it home and bend it up with my vice and a propane torch, then bolt the supports together.  very sturdy.

    It really turned out slick.  I thought of starting to sell them.  I have the photos on my computer at home, I'll have to post some up. I'd make some changes to my template now that I've done one. 

    I had to get a new flex plate to bolt it to my Hemi, which ended up being really expensive, but its done now and I can move forward with the wiring. 



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    PlumCrazyChris
    Mopar Muscle Cars of Austin
    Round Rock Tx
    70 Challenger 5.7, A518, A/C
    70 Challenger 340 convertible (Gone to Sweden)
    68 Barracuda (sold it too)
    www.mopar.org

    Offline PlumCrazyChris

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    Re: A518 Overdrive Questions
    « Reply #324 on: November 05, 2012 - 04:18:53 PM »
    Here are some pics of the trans crossmember I built. 

    I think it took about an hour or so to bend it up and bolt it together.  You could certainly weld it and it would be much stronger, but even with a few bolts, its quite stout.

    Chris
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    PlumCrazyChris
    Mopar Muscle Cars of Austin
    Round Rock Tx
    70 Challenger 5.7, A518, A/C
    70 Challenger 340 convertible (Gone to Sweden)
    68 Barracuda (sold it too)
    www.mopar.org

    Offline tactransman

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    • 1973 Challenger- Member here since April 14, 2006
    Re: A518 Overdrive Questions
    « Reply #325 on: November 05, 2012 - 06:35:12 PM »
    Nice !  :clapping:
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    Terry-tactransman 
    Torqueflite/Automatic Transmission Specialist
    Union, Mo.
    Give a man a fish and he eats for a day,teach him to fish and he eats for a lifetime.

    Offline ff6849

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    Re: A518 Overdrive Questions
    « Reply #326 on: November 07, 2012 - 12:24:05 AM »
    I read this thread twice, I haven't figured out yet will this fit or will not fit in an E-Body. From what I gather all it takes is BFH (big F-ing hammer) to pound some relief in the tunnel to fit, or do you need to actually cut and weld the floor pan some. There is also some trimming on the case. I actually have a have an A518 tranny so I am thinking of doing this in my '73 Cuda with a 440. Any information on fitting would help.
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    (__________]]]]]}~~~~

    73 440 Cuda'
    915 heads (mild head work, stock bottom end 10/9:1 compression)
    A518 2600-2800 Stall
    4.10 rear gear
    TTI headers with 3' exhaust with  X pipe 
    comp XE274H cam
    Hughes Roller Rockers
    Holley Sniper EFI
    Holley Street Dominator intake
    MSD ignition

    Offline rockymopar

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    Re: A518 Overdrive Questions
    « Reply #327 on: November 07, 2012 - 07:16:46 AM »
    Yes, it fits, no you do not need to hammer anything in the tunnel. trim the fins on the case in back. there is some sort of unused post on the right side to cut flush. The shifter can be a little tricky unless you have a column shift, then its a bolt in. The pressure switch plumbing is a little tight in the tunnel, but it fits. Fabricate a new crossmember and shorten the driveshaft and  smile because you spent way less money than the guys who installed the Keisler kit
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    Offline PlumCrazyChris

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    Re: A518 Overdrive Questions
    « Reply #328 on: November 07, 2012 - 06:25:11 PM »
    Thanks Terry.... taking orders..   :bigsmile:


    It does fit in Ebodies and 71 and up Bbodies without cutting the car.  I did have to dent my torsion bar crossmember slightly to allow the speedo cable easy access, and pounded the tunnel/floorpan some to add a little clearance, but its not significant. 

    One issue you'll have FF6849 is the fact that you want to hook this up to a big block.  These transmissions were never made to connect to a BB.  So that will require some additional work to cut off, and then bolt on an adapter bellhousing.  There is a great thread on Moparts from a guy that did this several years ago.  It turned our great for him. 

    You can keep the stock linkage pretty easily actually.  I thought it was going to be a hassle, but there was nothing to it.  If you get a pivot bracket from a column shifted car, (its L shaped with a bolt pressed in one end and a pivot hole and bushing in the other) you just pop out the bolt (protecting the threads) and pound it flat in the vice, then put the bolt back in.  My trans has a handy little tab sticking out that I bolted it through near the shifter linkage, and the other end is perfectly positioned to accept the (once vertical) now angled pivot post from the shifter.  Then hook up your shift linkage as usual and your done.  It was really pretty easy.

    Check out the thread on Moparts for the big block to see what you'd be in for.   For us smallblock guys its a no brainer, especially with a new do it yourself trans crossmember.... :cooldancing:
    « Last Edit: November 07, 2012 - 06:26:55 PM by PlumCrazyChris »
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    PlumCrazyChris
    Mopar Muscle Cars of Austin
    Round Rock Tx
    70 Challenger 5.7, A518, A/C
    70 Challenger 340 convertible (Gone to Sweden)
    68 Barracuda (sold it too)
    www.mopar.org

    Offline ff6849

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    Re: A518 Overdrive Questions
    « Reply #329 on: November 07, 2012 - 07:34:24 PM »
    Thanks plum, I would assume you need to keep the kick down linkage in place too.
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    (__________]]]]]}~~~~

    73 440 Cuda'
    915 heads (mild head work, stock bottom end 10/9:1 compression)
    A518 2600-2800 Stall
    4.10 rear gear
    TTI headers with 3' exhaust with  X pipe 
    comp XE274H cam
    Hughes Roller Rockers
    Holley Sniper EFI
    Holley Street Dominator intake
    MSD ignition
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