: 1988 Cadillac Brougham Engine Swap Question

02-10-07, 01:48 PM
Hello and thanks for providing such a great forum for us all. my question is this. I HAVE a 1988 Cadillac Brougham That is sitting with a bad engine. the engine is the 307olds, i HAVE a CHEVY (http://www.cadillacforums.com/forums/#) S.B. 400 ENGINE, also sitting. I also have a 400 trans SITTING. i am wanting to know what is involved with this potential swap. will i need to swap the tranny with the 400 turbo (http://www.cadillacforums.com/forums/#) trans as well? i have a good motor and trans that im willing to use to get the brougham going, can anyone offer any experience with a similiar swap? any information is appriciated

02-17-07, 03:13 AM
You will definetly need new motor mounts and maybe a tranny mount and have the driveshaft matched to the tranny. Definetly have to swap to the 400 trans. It wouldnt be the easiest swap, but It would be worth it I think. Definite increase in the cars performance.

02-18-07, 02:57 AM
From my understanding, the 307 mounts in via 2 mounts, on either side of the engine, then rests on an TH-400 or 200-4R trans on the rear. If the chevy engine has the same mounts, it should work. no idea on the trans.

02-20-07, 01:11 AM
The engine mounts are easily modified to work, but the trans would have to be swapped because its a different bolt pattern, the 200 R4 wouldnt hold that 400 anyway

03-01-07, 03:12 PM
TH 200-4R tranny is rated at 360 horsepower. The bell is a "Unicase" and will bolt up to any modern GM V-8.


03-01-07, 05:44 PM
The 200-4R, in the proper build, will handle up to 700HP. The problem is a brougham is 4000 pounds so you sit in gears at high torque for a long while before gear shifts; it's very stressful for the transmission if it hasn't been modified properly.

As a note, the 400 was put into the regular broughams and the 200-4r's were installed into the broughams destined to be limousines.

03-02-07, 07:28 AM
If you can find a 700-R4 it would be better if you want to have overdrive. If you dont care about overdrive I would go for a TH350 its just as tough as a TH400 behind a small block and with the smaller internals it lets more horsepower get to the wheels.

03-02-07, 11:34 PM
This is a great thread. Here's my '88 Brougham that pisses and burns oil - hopefully I can shed the 307 soon for something with some pep.

The Ape Man
03-03-07, 09:48 AM
Nice car. Time to crank in the RS hood adjustment stop though.

03-03-07, 10:57 AM
Thanks for the compliments! I cannot seem to get the adjustments quite right on the hood stops, and it's a royal nuisance when applying wax. I think it's chiefly leaking oil around the headgaskets. Sometimes an occasional small plume of light blush-gray smoke will come from the exhaust after start-up.

The Ape Man
03-03-07, 11:57 AM
The picture might be throwing me off but it looks like the header panel needs to come up on the RH side of center. It looks like it dips there. The hood is a little high on the RH side also. Sometimes cranking the stops in makes no difference because the depth of the hood latch has to go in a little also. I've adjusted much worse and had it come out looking OK. Takes time.