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Strawshop Opendrive Banjo Conversion DIY

Discussion in 'The Hokey Ass Message Board' started by Tman, Jan 10, 2009.

  1. Didn't save enough by building the shop/house outta straw so I STILL have to make stuff myself;). With all respect to the nice parts HotRod Works makes I thought I could do well on my own using stock parts.

    This open drive conversion uses the rear of your stock torque tube, the stock coupler, a Yoke that fits your driveshaft (in my case a GM) and a seal that matches that yoke. This yoke was bored out on the lathe so the coupler would press fit into it(1st pic on the left, you can see the splines are gone, this is a FRONT yoke). The two were then welded together and allowed to slowly cool.

    At first I thought I would have to machine a "cap" that would neck down the size of the TT to the OD of the seal but I realized they were darn close already. So a piece of 3" DOM 1/8" wall was used. The tube was press fit into the TT stub, welded then faced and bored to be a press fit for the seal. All work was done with hand tools, sawzall and cutoff until the welding/machining parts. The total working time was around two hours tops. A few beers were sacrificed while planning how long,where to cut.etc.

    Attached Files:

    Last edited: Jan 10, 2009
  2. The last pic shows a chunk of the DOM inside a cutoff (the redoxide part) of the Tourque Tube. It actually presses in TIGHT leaving a small gap at the top that held a nice bead to machine back down. There will be a small hole with a plug that will let you access the hole in the coupler to pin it to the pinion shaft. I am using a threaded bung and plug for this. I still need to work up a vent for the rear end, that will come next. All these parts came to less than $50.
  3. Pics show OK? I am just able to do some posting with a new browser. I have an assembled pic but am busy cleaning up junk on the camera first.
  4. Yes, the pictures are showing. Maybe I'll comprende more after an assembled pictured is posted.

  5. OK, here is the assembled pic. The seal is not totally pressed in since it will need paint and such.

    Attached Files:

  6. The seal was smaller in OD than the ID of the TT. So the DOM was pressed/welded in place and machined for a tight fit of said seal. OK:D Anymore aabreviations and I will get dizzy!
    MO54Frank and bct like this.
  7. Evilfordcoupe™
    Joined: May 22, 2001
    Posts: 1,817


    Thats pretty darn cool!!

  8. gashog
    Joined: Dec 9, 2005
    Posts: 978


  9. Thanks Jason. Smokey did one here YEARS ago. I found it in a search last summer. I forget if his was done like this? I just went for the easiest,most straightforward way I could come up with.

    Funny side note, I had been planning on running closed drive and converting a 4wd T5 to the torque tube when this tranny fell into my lap. About the same day I cut everything apart the pictures of the roadster using a TT and a 4wd tranny were posted!:eek::eek: So there was no turning back and Nosurf calls me a modernist:D
  10. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,410

    Flat Ernie
    Tech Editor

  11. continentaljohn
    Joined: Jul 24, 2002
    Posts: 4,692


    Great Tech, got any part number you want to pass along:D. Is that yoke a over the counter part?
  12. -Brent-
    Joined: Nov 20, 2006
    Posts: 5,863


    Very cool! Got a pic from the side that bolts to the banjo?
  13. I will get a banjo side pic later. looks like a TT with a tube pressed into it.

    You can read the seal PN. The yoke was internally splined (removed on the lathe) I believe it was a GM/Jeep yoke. Thought I had the PN but it is buried here. Just went to our driveline shop and told em what I was up to. Second yoke off the shelf was close enough to machine out for the coupler.
  14. The seal is Spicer PN 43085. I wrote F4C on the seal box, that may have been the yoke, I will do some further checking.
  15. Here are some inside pictures. The DOM was a TIGHT fit when I got it pressed in that far. There is some taper inside the tube which left a 1/16" gap on the other end. The gap allowed our weld to penetrate deep enough that much of it was left after facing it on the lathe.

    Attached Files:

  16. -Brent-
    Joined: Nov 20, 2006
    Posts: 5,863


    Wow... it's perfect. A much lesser expensive solution. Thanks!
  17. dirtbag13
    Joined: Jun 16, 2008
    Posts: 2,540


    nice tech , now i can do this to mine !
  18. Brent, if you need measurements I can take em. But, I figured that there will be a few common combos that guys will find. I cut everything as short as possible, TT, coupler,yoke so that the thing was as light as I could get it. My Driveshaft and tranny are GM, T4/5 stuff out of an AMC. To be safe I took my driveshaft and coupler to the driveline shop. Since AMC/Jeep used lots of GM goodies, Al the driveshaft guy looked at the common ones that had enough area for the seal to ride on and give me some fiddle room. It was really pretty trouble free! 10 minutes at the counter, tops.
  19. And since I can FINALLY post pictures again afterr months of not being able too is a shot of LilT taking his first ride at 2 years old on his Strider Running Bike! He calls it his HOT RAWD! He hangs out in the shop while I work.

    Attached Files:

  20. chaddilac
    Joined: Mar 21, 2006
    Posts: 13,862


    Thanks Tman... I feel really stupid now for spending $275 plus shipping!!!!!:D
  21. Jeff Norwell
    Joined: Aug 20, 2003
    Posts: 13,091

    Jeff Norwell
    Staff Member

    Excellent Tech Trent!!!!
  22. Good information, good thread. Thank you for this guys.
  23. chaddilac, call it the frugal Norwegian in me. You know how much PBR or HAMMS I can buy for the $200+ saved!?;)
    ratty baby 14 likes this.
  24. chaddilac
    Joined: Mar 21, 2006
    Posts: 13,862


    Enough to for me and gas to drive up and share with you!!:D

    I might have to do one of these for my other rearends!! Where did you get the yoke?
  25. Gearshop. Inland truck parts. They do my driveshafts and they also do large truck parts. It is an off the shelf yoke, just looked til we found one with meat enough to hog out for the Ford coupler.
  26. Very cool, Looks like another project to add to the list.
  27. Hudson, get you my number so we can talk about that motor deal.:)
  28. striper
    Joined: Mar 22, 2005
    Posts: 4,498


    Hmm, a vent eh? Do I need a vent too? My open drive conversion is very smilar.

  29. Southfork
    Joined: Dec 15, 2001
    Posts: 1,464


    Cool, Tman! How about posting a picture of the assembled unit from this same perspective (that is, the ass end of the TT piece). When assembled, and the seal in its final resting position, will the rear end of the coupler be flush with the back of the TT? Did you happen to find the manufacturer/part number of the piece you welded the coupler to yet?
  30. 40Tudor
    Joined: Jan 1, 2002
    Posts: 634


    Looks good. I really like this approach. Are you still going to pin the yoke to the pinion?

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