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Technical Redrilling '51 Chevy bellhousing

Discussion in 'The Hokey Ass Message Board' started by StefanS, Jan 28, 2021.

  1. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    Back to the 3 speed od topic I asked about a little bit ago...
    Is it possible to redrill the factory '51 bellhousing to allow the trans to bolt on? I've yet to find anything saying it's been done but I cant see why it couldn't.
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 56,044

    squirrel
    Member

    Is there enough metal there? How about some pictures?
     
  3. goldmountain
    Joined: Jun 12, 2016
    Posts: 4,470

    goldmountain

    I drilled holes in my transmission to line up with the ones in my adapter but it is critical that you get the alignment spot on. I traced the holes from another transmission that had the correct holes and lucked out but I wouldn't advise doing it.
     
  4. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    I'm not entirely sure. It's all still installed in the car so I havent looked at it yet. It the newer bolt pattern wider, taller or both? I'm trying to remember from my Hotrod Works T5 adapter but I can't. The '53 trans I have is packed away in storage so I can't take measurements off of it. I was also trying to find an extended pilot bushing so I could just keep the adapter plate but the longest I can find is .25" over
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 56,044

    squirrel
    Member

    The early 50s car transmission has a rather small bolt pattern, compared to the 55-later one. Take a peek under there if you can, and see what it looks like. I don't recall what the status of your car is right now, though...
     
  6. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    It's my alternate daily driver, I'm just bored with the floor shift. I'm trying to get things squared away before I pull the motor/t5 out since my lady uses the garage normally and I'll have it occupied. I try and collect all my parts before cracking into any project.
     
  7. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,904

    jimmy six
    ALLIANCE MEMBER

    Put on a 55-62 bellhousing and you won’t need to do anything but add an open drive shaft rear end. Stock column linkage will work too. You are already going to make a plate to use the trans mount.
     
  8. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    I have a '58 truck bellhousing. My car's running a T5 and s10 rear. I have the timing plate motor mounts (but I'm seriously considering getting the front corner motor mount kit off ebay), the bellhousing (anti twist) mounts and a Waltons crossmember (soon to be Hotrod Works for the added ground clearance). My concern with using the truck bell, besides having the chain link clutch connection putting side load on the release bearing, is the bellhousing mounts, unless they're not necessary.
     
  9. Doesn't the truck bell have the correct pattern for the tranny?
     
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  10. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,904

    jimmy six
    ALLIANCE MEMBER

    Yep^^^^ the 58-62 car has no side mounts on the bell. Trucks from 48-59 do for sure.
     
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  11. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    It does but see my concerns above...
     
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  12. Ken Smith
    Joined: Dec 6, 2005
    Posts: 419

    Ken Smith
    Alliance Vendor

    The clutch fork position on the pickup bellhousing is different than the passenger bell housing.
    If you use the pickup bellhousing with the passenger clutch linkage it will cause binding.
    Pickup on the left, passenger on the right.

    PICKUP BELL VS PASS BELL.jpg
     
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  13. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    Correct, that's what I was saying with side loading.
     
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  14. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,950

    Mr48chev
    ALLIANCE MEMBER

    The mounts for a truck bellhousing are different too.
     
  15. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    These differences are the exact reason I started thinking about redrilling
     
  16. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,950

    Mr48chev
    ALLIANCE MEMBER

    I'm not sure that there is enough metal there to drill.

    Hopefully someone has both the small pattern and the later pattern bellhousings out where they can take a photo or two and post the differences.
     
  17. squirrel
    Joined: Sep 23, 2004
    Posts: 56,044

    squirrel
    Member

    I still don't understand what is in your car, and what you are planning to do.

    But this is the difference in transmission bolt patterns between the old car bell, and the newer car/truck bellhousing

    PICKUP BELL VS PASS BELL.jpg
     
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  18. Ken Smith
    Joined: Dec 6, 2005
    Posts: 419

    Ken Smith
    Alliance Vendor

    Last edited: Jan 28, 2021
  19. Ken Smith
    Joined: Dec 6, 2005
    Posts: 419

    Ken Smith
    Alliance Vendor

    6inarow, ekimneirbo and Hnstray like this.
  20. I would just get or make an adapter plate .

    as far as the extended pilot bearing and machine shop could make you one out of navy bronze ( not cheap) but probably the best solution in this case.

    alternatly if the bushing is sticking out of the fly wheel to far, drill and bush the flywheel to hold the bushing completely.

    more use a truck bell and modify the side mounts and clutch fork

    or use a 55 and later car bell and fab a cross member.

    ain’t gonna be an easy task , but you do have many options to get it done.
     
  21. RPMX1000
    Joined: Mar 18, 2009
    Posts: 6

    RPMX1000
    Member

    To install a later 3 speed, Iused a 61 car bell housing as it doesn’t have the mounts on it as they are not needed on 49-54 car. Then welded a pad at 8:00 and milled flat/drilled/tapped to relocate the clutch lever pivot from the 61 bells 9:00 pivot location. Ground out window in side of bell. Use the stock clutch lever. Works really great no issues. We welded it ourselves with preheat/7018 rod and a friend has a mill. It was a bear to drill and tap as we didn’t know what we were doing and likely hardened the cast iron when welding it. Someone may know the proper way to weld this to make it easy to drill.
     
    Last edited: Jan 28, 2021
  22. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    Oh wow that's not even close, huh?
    I have a '58 235, an '89 s10 T5 and a Hotrod Works adapter plate. I'm thinking of switching back to column shift without having to put the torque tube back in. On the same note, I have the car for sale and when/if it does sell I dont want to lose the t5 because I want it for the '49 Ford coupe eventually. I'd get more for the car with the 3 speed overdrive than I would with the 3 speed and torque tube. I also wont need the s10 rear since it's too wide for the Ford.
     
  23. Ken Smith
    Joined: Dec 6, 2005
    Posts: 419

    Ken Smith
    Alliance Vendor

    Shortest path seems to be either modify a pickup bell housing or get/have machined an extended pilot bushing.
     
    Last edited: Jan 28, 2021
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  24. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,660

    Truckedup
    Member

    I would cut out the area below the clutch arm on the later housing and move the pivot ball lower...Mostly because I am a hillbilly and it's low cost, crude but effective
     
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  25. ekimneirbo
    Joined: Apr 29, 2017
    Posts: 4,273

    ekimneirbo

    If I understand correctly, you want to do all this just to save the T5 for another project. It looks like you are going to have a lot of work solving lots of small problems and maybe have as much money invested as you save. If you have a really good T5, I'd just look for a cheap one you can swap in its place and use what you can get for the 3 sp OD to offset that cost. Getting the shift linkage and clutch/TO to work may be more of a problem, then you have to make the OD work too. If you use an adapter, will trans mount still work, or driveshaft length? Lots of niggling little details that often make for a lot of work.;)
     
  26. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,355

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    I don’t know if this post will present any useful info, but here goes.

    Many decades ago (1962 ....I was 18).....my best friend’s Dad, an older man and carpenter, had a dilemma. His Studebaker work truck (‘50 ish) six cylinder gave up the ghost. He had a very good running ‘48 Chevy and asked me if I thought the Chevy engine could be put in the Studebaker and make it useable again. I said “no harm in trying”, so I proceeded.

    The point of this tale, I adapted the Stude trans to the Chevy bell housing. I swapped the front bearing retainer to get the right size OD for the Chevy engine. Bored out the pilot bushing a bit for the Stude input shaft. Then test fit for bolt pattern.

    Was able to drill the bell housing for the upper bolts and decided to drill and tap the face of the Stude trans to match the lower bolt holes of the Chevy bell housing and the bolts inserted from inside the bell to the trans, like Chevy pickups.

    Maybe something like that would work here.

    Ray
     
    Last edited: Jan 28, 2021
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  27. Ken Smith
    Joined: Dec 6, 2005
    Posts: 419

    Ken Smith
    Alliance Vendor

    That’s an idea. Maybe all 4 bolts would work like that



    Sent from my iPhone using The H.A.M.B. mobile app
     
  28. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    I wish I could find a cheap t5 to swap in. All I can find are the 4.03 first gear versions and even those are going for way too much.
     
  29. StefanS
    Joined: Oct 7, 2013
    Posts: 1,287

    StefanS
    Member
    from Maryland

    Will your adapter plate hold up to supporting the rear driveline weight if I lose the bellhousing side mounts? Im going with the Davis Speed front corner mounts to keep the twisting down and then just the trans mount if possible. Doing that will put alot of pressure on your plate as far as it tying the motor and trans together in the middle.
     

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