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BW M40 Auto Trans - any issues paired with a 390? |
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Stink
AMC Fan Joined: Apr/18/2021 Location: Whitehouse, NJ Status: Offline Points: 8 |
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Posted: Apr/18/2021 at 7:03pm |
I found out a previous owner replaced the original auto trans in my 1969 AMX (which has a 390) with a BW M40, which went with the 290 engines. Is there any trouble I can expect with this combination? It currently shifts great and there are no issues that I can feel when I drive it. I pulled the pan and fluid looked good, nothing in the filter either.
Thanks for any insights...
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11483 |
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All I can recommend it go easy on the gas! The M40 was made for a 210 hp engine, not for a 315 hp one. If you drive it gently, it may last. If you like to squeal the tires, it will be toast.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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Stink
AMC Fan Joined: Apr/18/2021 Location: Whitehouse, NJ Status: Offline Points: 8 |
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Thanks Ramblin, I'll do that, although if it goes, then I have my excuse to drop a modern 4 speed automatic in it!
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3769 |
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I would start planning for a replacement. Why have a powerful car if you have to drive it like there's an egg under your foot?
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19612 |
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I have to agree with Steve. At least with an operating trans you don't have to be in a hurry to find a replacement, but better start looking. You don't have to exactly drive like there is an egg under the pedal, but I wouldn't be hard on it either. Normal driving will be fine. Even the 290/4V got the heavier BW M-11, as AMC knew people would be trouncing it with the 4V.
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Frank Swygert
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