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Old 05-03-2013, 05:30 PM
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455 Olds Engine into 56 GMC

The title is the question - - Will a 455 ci Olds engine fit in a 56 GMC truck?


Also, which gm overdrive transmission will best fit behind the 455?

Thanks, David

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Old 05-03-2013, 06:38 PM
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The Pontiac guys will love ya for the swap.I would contact TCI about their 6 speed auto and dimensions
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Old 05-03-2013, 06:46 PM
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Originally Posted by vinniekq2 View Post
The Pontiac guys will love ya for the swap.I would contact TCI about their 6 speed auto and dimensions
that trans is a 4l80e
may need a hammer to make it fit as it's bigger than a th400
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Old 05-03-2013, 07:20 PM
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Do you already have a 455? The jimmy trucks like yours were available with first gen Olds V8's in heavy duty applications. As much as I like the 455 (I'm putting a 455 Olds in my 65 C10) I think a 394 would look killer under the hood and get the job done power-wise.
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Old 05-04-2013, 12:53 AM
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Would the later model trans' from GM still require the BOP bolt pattern for that motor?
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Old 05-04-2013, 05:09 AM
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Would the later model trans' from GM still require the BOP bolt pattern for that motor?
yup need adapter..
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Old 05-04-2013, 12:06 PM
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Originally Posted by vinniekq2 View Post
I would contact TCI about their 6 speed auto and dimensions
The TCI "six speed" is really a 4L80E. TCI changes the software to engage the OD clutch pack between normal gear shifts, splitting the lower gears. Two concerns.

First, the 4L80E OD clutch pack has only two plates. It's very easy to break. DO NOT ask me how I know this...

Second, why does an engine with 500 ft-lbs stock need additional gear ratios in between first and second, and second and third? Kind of a waste of money, in my opinion.
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Old 05-04-2013, 12:07 PM
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Thanks everyone for the quick info. I do have the 455, it has been kept 30 yrs on an engine stand, run every month or so. .... 43,000 miles.
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