61 Cadillac deville, 472 swap??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-17-2012, 12:42 AM
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61 Cadillac deville, 472 swap???

Right, I have a 61 deville, body and interior are mint, have almost finished full air bag install, big brake conversion full suspension re bush etc etc, plans were to rebuild the original 390 and trans, however Ive been pushed into a real short deadline. Engine is tired with alot of blow by, The trans leaks like a sive and doesnt change very well, living in New Zealand makes it a mission to get parts for both. Next option is fairly cheap good running mid 70s deville 472 and matching box. has anyone done this conversion or know how much I'm going to have to hack up the cross member or sump etc, are the tranny's similar length?, do they use the same yoke, are the engine mount points in a similar location? What's involved in moving the oil pick up if I need to convert it to a front sump? Front clip is currently off car being powder coated so now would be the time to do it. Any info would be much appreciated.

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Old 04-17-2012, 05:16 AM
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Your pan should already be a front sump. I can't help w/specifics but I can say that this will require fabrication skills; it's a long ways from a plug and play deal.

Back when, the go-to tranny was a manual Cad LaSalle three speed. The '61 has a Hydramatic, the difference in transmission lengths between it and the long tail shaft TH400 I'm unsure of, but if you can get the driveshaft that matches the new engine or one like it (would have a TH400 yoke), it can be grafted onto the existing d-shaft and the d-shaft made to whatever length it needs to be.

Hopefully someone here will have actually done this swap and can give you some details.

An option would be to use the TH400 w/an adaptor to fit the 390. Then all you'd need to do is freshen up the 390- no fabbing motor mounts, etc.

Last edited by cobalt327; 04-17-2012 at 05:33 AM.
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Old 04-17-2012, 08:35 AM
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WIKI for Cad

I don't know your answers but there is a WIKI article here on Hotrodders in the engine info about Cadd's and sources of suppliers. I have a 472 running my sawmill.
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Old 04-17-2012, 09:23 AM
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As swaps go this is a fairly easy one..the main thing will be the front motor mounts as that will require some thinking and fabrication..Cad500.com may be able to help with the mounting issues..I would just do it myself..use the whole 472 and keep the the TH400 that comes with it as that will make life so much easier for you..

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Old 04-18-2012, 12:44 AM
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Another source is Maximum Torque Specialties www.500cid.com, all they do is the big Cadillacs.
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Old 04-18-2012, 02:19 AM
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Thanks for the info guys, I'm an engineer by trade so fabing engine mounts is no prob, the only worry would be if the 472s mount mid block or anything silly like that. As I don't have a lot of time to play with. I've searched through a bunch of forums for similar build threads but haven't turned up much info. Was hoping someone may have done it before and have had picked up on any little clearance issues etc.
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Old 04-18-2012, 03:59 AM
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The 472 does mount mid-block well a bit forward of mid-block so it may or may not be an issue...

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Old 04-18-2012, 07:46 AM
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Wiki Info

There is a lot of Cad info here on hotrodders in the WIKI engine section, I have a 472 running my sawmill, cads used hich nickle allow blocks and they last forever,
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Old 04-18-2012, 10:21 AM
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Her's an old pic of my 500 in the '32 chassis
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