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Old 06-26-2007, 09:18 AM
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GM Trans Swap

I have a 56 Chevy truck with a 4 speed (granny low) transmission and bell housing out of a 74 1/2 ton 2 wheel drive truck. I think it's a SM465..., but not positive. I just purchased a Borg Warner Super T10 4 speed and will be swapping. I don't know much about transmissions. So here's the questions. Will the bell housing I have in the 56 work? Will there be modifications to the transmission cross member? I feel the drive shaft will have to be modified (again). Any comments are appreciated.

Thanks
Channel Cat

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Old 06-26-2007, 10:37 AM
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You can bolt the trans up to that bell, but you need to check the spline type on the clutch disc. The pilot bushing should be the same.

Driveshaft:

You might have a solid rear flange on the back of the truck 4 speed that has to use a slip yoke on the driveshaft. If you do, you need to eliminate that in-line slip joint and use a car type front yoke on the driveshaft. However, if you do have the in-line type slip joint, I would think that the driveshaft tube will be too short when you cut it off and weld a u-joint yoke back onto your shaft.
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Old 06-26-2007, 11:26 AM
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You may aslo need a spacer ring in the bore of the bellhousing. (to center the trans in the bell housing)
The bell bore on a truck trans is bigger than a car trans.

Oh, and an AT trans crossmember may be needed as well.
The trans mount on the truck tranny is quite a bit lower than the car trans.

Bryan
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Old 06-26-2007, 11:43 AM
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Chey Trans Swap

Thanks for the information. It lets me know what's coming and be better prepared. I hate to stop working and run to a parts store.
Would it be better to pick up a used car 4 speed bell housing instead of using a spacer ring? Will a car 3 speed bell housing be the same? I will use an 11" clutch, do the bell housings accept this or........? Is there a specific bell housing casting number I should look for and avoid?
On the yoke: FYI - the drive shaft is a 2 piece. It sounds like I may need a yoke to match the transmission and the drive shaft will be modified. I expected to modify the drive shaft and cross member. The truck is actually a 55 front, 56 back, 74 motor & trans, 84 9" and front clip.
Thnanks again.

Last edited by Channel Cat; 06-27-2007 at 02:16 PM. Reason: More Questions
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Old 07-10-2007, 02:15 PM
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Still Need Help on Transmission Swap

I could use a little more help on my question concerning Chevy bell housing casting numbers and what I should be looking for.
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Old 07-10-2007, 02:42 PM
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The small bore 3spd housing will work just fine------some of the truck 3-spd had a big bore as well, so watch out there.
I used a spacer in the 59 Elky (87 truck bell/clutch slave), I have no issues with it. However, the style I used required some machining on the trans bearing retainer---no biggie.
There are now spacers available that can be held in place by larger washers on the bearing retainer---no machining---better

Any of these spacers should be less than $50.
Might contact http://www.classicchevy5speed.com/ (hope the link works--if not do a search on them) They may have the spacer needed
McLeod (clutch people) has the one I used---required maching.

Bryan
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