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89 Brougham, 81 Fleetwood Coupe
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Discussion Starter #1
Hi guys,

My neighbor looking to sell his 1981 Brougham d'elegance Coupe. It use to have the 6.0L 8-6-4 engine in it. This engine and the transmission are now gone but he give a 350 engine with the transmission from an 80's oldsmobile but he dont remember which one.. I dont know much in mechanic thats why Im asking my questions here.

Would it be a big thing to put that 350 in that caddy considering the engine and transmission are fully working?

How much would it cost in a 'normal' garage to do the job?

I know I dont have a lot of info but your opinion and ideas will be appreciate. thanks

$_27.JPG
 

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chevy 350 powered 86 FWB, 00 safari h.t. 66 toro, 83 lesabre
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6,397 Posts
Hi guys,

My neighbor looking to sell his 1981 Brougham d'elegance Coupe. It use to have the 6.0L 8-6-4 engine in it. This engine and the transmission are now gone but he give a 350 engine with the transmission from an 80's oldsmobile but he dont remember which one.. I dont know much in mechanic thats why Im asking my questions here.

Would it be a big thing to put that 350 in that caddy considering the engine and transmission are fully working?

How much would it cost in a 'normal' garage to do the job?

I know I dont have a lot of info but your opinion and ideas will be appreciate. thanks

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=309857"/>
Is it a 350 Oldsmobile or 350 chevy? Either way, frame side motor mounts are available used. 350 Chevy mounts can come from a caprice, monte with a Chevy v8, or even a truck (but the passengers side one will have to be refilled). 350 olds mounts can come from any 77-90 b or c body car (caprice, delta, 98, lesabre/ electra/ P.A., Catalina, parisienne, or full size caddy) equipped with the olds 350, 403, or 307. You will need a new driveshaft more than likely. Depending on whether it's an olds or Chevy 350, the driveshaft can come from an 86-90 or 90-96 RWD caddy

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As for how much to do the swap, a swap at a shop with you supplying all the parts should cost 700-1500 in labor. Putting a 350 Chevy in place of a 307 olds in my 86 brougham cost me 1100 IIRC (given a labor rate of 95 an hour, and including new coolant hoses, fuel lines, battery cables, and having to setup the trans and make a bracket for the throttle/ trans cable.
 

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70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
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Re: 1981 Cadillac Brougham Coupe 350 swap

Sharp looking car, that will be a nice ride. The frame mounts in it now should fit either the Olds or a Chevy. I hope it isn't missing too many parts under the hood. Post some pics of your spare engine and frame mounts and we can advise further. The scenery looks like Maine farm country. If it is I would install it pretty reasonable. good luck.
 

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89 Brougham, 81 Fleetwood Coupe
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Discussion Starter #4
Re: 1981 Cadillac Brougham Coupe 350 swap

thanks!

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Sharp looking car, that will be a nice ride. The frame mounts in it now should fit either the Olds or a Chevy. I hope it isn't missing too many parts under the hood. Post some pics of your spare engine and frame mounts and we can advise further. The scenery looks like Maine farm country. If it is I would install it pretty reasonable. good luck.
I will try to post more picture. Im actually in New Brunswick, Canada. Almost Maine :p
 

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87 Brougham, 1969 Calais, 95 FWB, 07 SRX, 07 ESV
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4,246 Posts
Re: 1981 Cadillac Brougham Coupe 350 swap

nice what part of new brunswick? I actually bought my 87 up there. I'm from Fort kent, maine. Just across the border from claire NB.
 

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89 Brougham, 81 Fleetwood Coupe
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Discussion Starter #6
Re: 1981 Cadillac Brougham Coupe 350 swap

nice what part of new brunswick? I actually bought my 87 up there. I'm from Fort kent, maine. Just across the border from claire NB.
Im in Grand Falls area. Just on the other side of Hamlin, Maine

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Is it a 350 Oldsmobile or 350 chevy? Either way, frame side motor mounts are available used. 350 Chevy mounts can come from a caprice, monte with a Chevy v8, or even a truck (but the passengers side one will have to be refilled). 350 olds mounts can come from any 77-90 b or c body car (caprice, delta, 98, lesabre/ electra/ P.A., Catalina, parisienne, or full size caddy) equipped with the olds 350, 403, or 307. You will need a new driveshaft more than likely. Depending on whether it's an olds or Chevy 350, the driveshaft can come from an 86-90 or 90-96 RWD caddy

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As for how much to do the swap, a swap at a shop with you supplying all the parts should cost 700-1500 in labor. Putting a 350 Chevy in place of a 307 olds in my 86 brougham cost me 1100 IIRC (given a labor rate of 95 an hour, and including new coolant hoses, fuel lines, battery cables, and having to setup the trans and make a bracket for the throttle/ trans cable.
I also have a 90 Brougham sitting in my back yard. It has the 307 engine. So I assume that this engine/transmission/driveshaft would fit it that 81?
 

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89 Brougham, 81 Fleetwood Coupe
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Discussion Starter #7
Re: 1981 Cadillac Brougham Coupe 350 swap

Here some pictures of the 350 engine and the parts that come with it


IMAG1878 - Copy.jpg

IMAG1879.jpg

IMAG1884.jpg
 

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70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
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Re: 1981 Cadillac Brougham Coupe 350 swap

It looks like he saved all the parts. The engine is already sitting in the car? It looks like the frame mounts aren't bolted down. That car shouldn't be too hard to piece together. I like it, I even like the wheels that are on it.
 

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1980 FBC
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979 Posts
Re: 1981 Cadillac Brougham Coupe 350 swap

Well its an Olds 350 which can use a copy of the original transmission. No need to mess around with driveshaft.

Exhaust will be plenty of fun...........
 

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87 Brougham, 1969 Calais, 95 FWB, 07 SRX, 07 ESV
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4,246 Posts
Re: 1981 Cadillac Brougham Coupe 350 swap

Looks like a fun project. Should be pretty easy. I believe all of the accessories off of the 307 you have in your back yard will also fit the 350 so you'll have some spares in case you need anything.
 

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1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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6,796 Posts
Re: 1981 Cadillac Brougham Coupe 350 swap

The drive shaft depends on the transmission just as much or more so then the engine, and what axles the different cars have can also have an effect on the length.
The exhaust shouldn't be too bad, if parts don't line up just order parts for a a 307 car. Putting one of those olds or sbc engine in there should be an easier swap then a lot of engines since the parts to make them fit these cars are already out there.
 

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1980 FBC
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979 Posts
Re: 1981 Cadillac Brougham Coupe 350 swap

I re-read my post and may have not made myself clear.

The Olds 350 bolts up to the car's original transmission and has enough torque to work fine with the factory 2.41 gearset.

All the guy needs is a copy of the original TH-400 short tail transmission from the '81.

Anything else is going to be lots of work.

Of course the driveshaft depends on whatever transmission is used:)

One more reason not to change the type of transmission in this case.
 

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1983 FWB (Mac), 1981 SDV (Junkyard Dog)
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Re: 1981 Cadillac Brougham Coupe 350 swap

As I recall, the 81 car would have had a Turbo 400 in it, no? He could still use the Turbo 200 and matching driveshaft provided that it came from another Cadillac.cheers......R.
 

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1980 FBC
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979 Posts
Re: 1981 Cadillac Brougham Coupe 350 swap

'81 RWD gas V8 used TH-400 with an additional clutch pack.

TH-200 would require proper steering column detent, speedo housing with proper readout for PRNDL, electrical stuff for lockup clutch, throttle detent cable which can also need a whole different carbonator baseplate and a speedometer correction unit when rear axle gear is different than TH-200 donor car's.

The driveshaft will work fine but you have to swap the transmission yoke and install the shaft with some load on the rear axle springs with a 400 shaft used with a 200 in this chassis.

The overdrive and lockup will put RPMs a little low for an Olds 350 without fuel injection. Fine for a more modern design with precise spark timing and fuel injection/modern tuned air induction. Not so fine for a carbonator.

Changing the rear axle to a higher numerical gear like a 3.08 would be worth the effort but a posi is a must with any power or power multiplication on these Cadillacs.

As I said, a lot of work to do it properly............

Even then you still have a weakling transmission.

Been there, several times.
 

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1986 Fleetwood Brougham
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That's a great looking car. The chrome wheels balance out the chrome on the body and the blackwall tires balance out the black paint. The tires are the perfect size to my eye. Are those 235/70R15 or 235/75R15? Mine has 225/75R15 but your tires look beefier.

How many miles are on the two transmissions you are going to pick from? I like the idea of using the 200R4 from the '90 to get overdrive. More work on the column shifter mods etc. but may be worth it if the miles are lower. You could move the trans, driveshaft and rear end all over to the '81.
 

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89 Brougham, 81 Fleetwood Coupe
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Discussion Starter #17
Thank you guys for all your comments and advices, I decided to buy the car since it was cheap and I've never had a 2 door Caddy. I will be able to get more details about the engine and transmission once its in my garage.
 
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