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Old 03-25-2012, 05:29 PM
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Help swapping powerglide to M20

Has anyone got some tips on the support for a powerglide to M20 conversion as far as a trans support? It is going in a 56 belair sedan, behind a 265.

Thanks!

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Old 03-25-2012, 06:25 PM
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Use either the stock 56 manual trans belhousing or better yet a Lakewood or similar housing that will accept the 55-57 mounts. Driveshaft/yoke is the same. Stock pedals and clutch linkage.
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Old 03-25-2012, 06:38 PM
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let me try again I'm looking for information on cross member support for the transmission
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Old 03-25-2012, 08:00 PM
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If you use a crossmember for the rear of the trans mount. The front mounts must be changed to the conventional later model side mounts. or the stock belhousing mounts kept. Too much distance between mounts if stock front mounts and tailshaft mounts are used. Has been known to crack belhousings, overload front engine mounts and cause other stress problems..
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Old 03-26-2012, 07:18 AM
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would it work fine without the cross member mounting? every tranny i have ever done has had one
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Old 03-26-2012, 04:16 PM
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4-speed manual trans is the same basic dimensions as the stock manual and p-glide. All of which hang on the belhousing with no c-member. Works great/reliable. They just did things a bit differently in the fifties.
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Old 03-26-2012, 07:03 PM
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In regards to the tri-five Chevrolets, they have "front" mounts stock, and rear bellhousing mounts. Most guys go to the side mount modification when they use a rear crossmember. But, since the transmissions "hang" off the back in tri-five Chevrolets, you can use your Muncie/Saginaw/Borg Warners the same way. You can also add a read crossmember for EXTRA trans support. They have been many aluminum case transmission that suffered broken ears from "hanging" off the back, and being driven in a "spirited" fashion. So, use your stock front mounts and bellhousing mounts, but add a rear crossmember for extra piece of mind. If you go with side mounts for the engine, then just a rear cross member is fine.

Cross members are available from any of the tri-five vendors or on E-Bay; they're also easy enough to make.
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Old 03-27-2012, 08:28 AM
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great! Thanks!
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