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Swapping HT4100 (4.1L V8) Fleetwood Brougham with a 5.7L V8

4059 Views 5 Replies 4 Participants Last post by  kennethfjoe
I have a 1985 Fleetwood Brougham RWD with a 4.1L and a THM200-4R transmission. However, it started leaking engine coolant. After inspection, it is somewhere from the back for the engine - very possibly engine block. I am looking to replace this engine. I found a 1990 Cadillac Brougham with a 5.7L engine. The 1990 model has an electronic speedometer, etc., and as far as I researched a THM700-4R transmission. Is it possible to swap the 5.7L engine into my 1985? Will it work with my current transmission, or will I have to include a transmission swap? I really appreciate advice.
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I swapped the 4.1 for a 5.7 350 sb and I love it. There is a reason why they only did 1 year with that engine.
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