Article - Install a 4R70W into a Cobra - Page 18

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  1. #256
    Senior Member Array boosted2000si's Avatar
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    Quote Originally Posted by boosted2000si View Post
    Has anyone had any luck with a 4R70W, stock IRS and a GT Auto Driveshaft with the IRS flange on it?

    I think it may work, but I still have yet to put the pinion on and bolt it all up. I just wanted to know if anyone has had luck before I pull the u joint and such. Or I just need to order a new shaft.
    Well after giving it a try tonight, DOES NOT WORK. Turns out the auto drive shaft utilizes a smaller u joint than the factory t56 flange.
    Last edited by boosted2000si; 08-11-2011 at 05:20 PM.

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  3. #257

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    Quote Originally Posted by boosted2000si View Post
    Well after giving it a try tonight, DOES NOT WORK. Turns out the auto drive shaft utilizes a smaller u joint than the factory t56 flange.
    Most people use the stock 03-04 Cora driveshaft and swap out the front yoke with the 4r you using a hybrid 1350 to 1330 u-joint, then retain the 1350 u-joint on the rear with the IRS flange. You could probably do the same thing with the auto GT driveshaft just using the hybrid 1350 to 1330 u-joint at the rear so you can utilize the stock IRS flange on the driveshaft.

  4. #258
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    So I'm guessing an auto equipped mach 1 or gt's computer will pull the trans out of OD at even high speeds since this trans cannot take much power in od? I'm asking because I'm sure there's plenty of stout 2v gt's and mach1's with blowers or nitrous that get into some high speed runs with supras, vettes, and such. and they too would hurt their tranny's?

    For you guys running at the drag strip who employ a lock-up function on their 4r70w's with a manual valve body, do you guys just go through the gears as usual and lock up in third after the 2-3 up-shift, or do you just leave it unlocked?

    Also if you were going at a pretty high speed, "say over 100mph" you still couldn't floor it in od? I can see why you wouldn't want to floor it in od at city speeds, but a higher speeds, I wwould think it would be OK?

    How much for the baumanator controler with harness and tuning supplys?

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  6. #259
    Senior Member Array 99blkcobravert's Avatar
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    Default 4R70 & Baumannator

    For a fully auto setup, the Baumannator offers great control and comes with a few files tuned for the Cobra. Check the Baumann engineering site for pricing and all the support items.
    As far as WOT in OD; I don't believe the 4R70W will stand up to that level of power.

  7. #260
    Senior Member Array boosted2000si's Avatar
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    Quote Originally Posted by 4sdvenom View Post
    Most people use the stock 03-04 Cora driveshaft and swap out the front yoke with the 4r you using a hybrid 1350 to 1330 u-joint, then retain the 1350 u-joint on the rear with the IRS flange. You could probably do the same thing with the auto GT driveshaft just using the hybrid 1350 to 1330 u-joint at the rear so you can utilize the stock IRS flange on the driveshaft.
    I got rid of my T56 shaft when I sold the swap, but my new swap came with the GT Auto Shaft.

    I was able to take the GT Auto Shaft to a local driveline place, they cut 1 inch off the shaft and used one of the conversion joints you mentioned to put the IRS flange on. It work perfect, fits great. I think We used a shaft length of 45inches, and with the flanged on it gave us the length we needed. That was a few weeks ago so I may have the exact numbers a little off.

  8. #261
    Senior Member Array boosted2000si's Avatar
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    Quote Originally Posted by 99blkcobravert View Post
    For a fully auto setup, the Baumannator offers great control and comes with a few files tuned for the Cobra. Check the Baumann engineering site for pricing and all the support items.
    As far as WOT in OD; I don't believe the 4R70W will stand up to that level of power.
    I was really scared to use the Baumannator after a few negative comments I read about it on the net.

    I still ended up using it and it is a GREAT trans controller. SUPER simple to use, they have some really good preloaded files and Kevin at Baumannator is awesome for tech support. He helped me every step of the way. I would HIGHLY recommend it. I would love to see what the new optishift has to offer.

  9. #262

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    I know this is an old article does anyone have it with the pictures? they are all gone now


    Thanks

  10. #263

    Default Great Article! Anyone still have the pictures????

    Quote Originally Posted by got_h8rs? View Post
    I know this is an old article does anyone have it with the pictures? they are all gone now


    Thanks
    Yes! Doing this exact swap now and would love the pictures too!

  11. #264
    Senior Member Array 99blkcobravert's Avatar
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    I have a few pics of my swap. Let me know what you are looking for and I'll see what I can find for you guys.

  12. #265

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    Thanks 99blkcobravert! Was working on the wiring for the transmission. I think I got it correct based on the text (just finished 5 minutes ago!). I'd love to see some pics if you have some.

  13. #266
    Senior Member Array 99blkcobravert's Avatar
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    Are you using the Baumann Engineering unit to control the shifting?
    Assuming you are converting from a 6 speed to an automatic, how did you get the electronic pulses from 6 on the stick to 12 on the auto?
    I have all the wiring info if you need help.

  14. #267
    Senior Member Array 99blkcobravert's Avatar
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    Try this site for some pics. It's slow, but good stuff.
    http://www.alternativeauto.com/Water...onversion.html

  15. #268

    Default Driveshaft spacer for 03-04 rear pinion flange!!

    Bump to an old thread to add some usable info!

    Hello everyone. It has been years since I have been on here and much appriate the info on the 4r70w swap since I am in the middle of a swap on my wife's 03 vert. We picked it up 2 years ago now and I have been the only driver since my wife has not picked up learning to drive a stick besides around a parking lot. So now I am putting a 4r75w in it for her. This one is a cruiser that I resurected from the grave and my turbo 03 Cobra is the race car so it is all good. Lol

    I always like adding my findings back into the pool after finding better options to make things even easier.

    I wanted to share some info for others that might be in this boat and hope the artical can be updated with my findings. I found there is no need to by the steeda driveshaft spacer and convert the DS and rear flange to the GT size. The rear flange factory on the Cobras are the same 3 inch bolt hole to bolt hole unit (with a 2 inch centering hole) used on the F150s and we all know there are a ton of companies making lift kits for them and in turn driveshaft spacers. What you need is a FABTECH FTS92003 Drive Line Spacer it is 3/4 and comes with bolts (I will verify if the bolts are correct later). The spacer is a direct bolt up to the rear of the 03-04 cobra driveshaft. That was step one!! Next I ordered a slip yoke for the the front that fits the factory driveshaft 1350 size but is almost 7 inches from the center of the hole to the end of the splined slipe yoke. This should add another half inch in length to take the 43 inch cobra driveshaft to the needed 44.5 inch length for the 4r70w and 4r75w transmission with the factory IRS. My goal was 45 inch but thats close enough in my book and much better than just running the steeda spacer with all the down graded GT parts to make it work. I will list the part numbers and pics when the part is here and I get to test fit it but according to my measurments it will give more spline engagment and allow people doing this swap to used the factory 03-04 cobra driveshaft with proper spline engagment.

    I hope this helps because I put a ton or research into this. I just couldnt bring myself to buy a custom 45inch drive shaft when the cobra unit is so nice from the factory. The spacer was $45.50 and the slipyoke was $79 if I remember correctly and everything should fit perfect. Stay tuned as I work on this project for my wife.

    Project notes:
    Rebuilt 19k mile 03 Cobra vert
    TVS superchager and all supporting mods
    4r75w transmission with GT converter (Mach1 would have been better stall from my reading but very close)
    HGM Compushift Sport transmission controller (Wife wants it to drive like the 2004 GT factory auto that we sold.)
    Derale 20561 transmission cooler in front drivers side fender. (only slite mods to bracket and one hole in the car's metal to mount it)
    All the misc auto swa parts are out of a wrecked 2004 GT. gear selector, pedal, cables and so on. Got it all. Lol
    Last edited by ruthless; 12-11-2019 at 09:40 AM.

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