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Old 10-05-2002, 11:49 AM
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Question slant 6 to 318 duster... help...

i have a 73 plymouth duster, with a slant six, 3spd auto im pretty shure its a 904 trans, and a 8 1/4 rearend, will a 318 bolt right in to the transmission, please help,, i was going to get those shumacker small block conversion motor mounts so thats taken care of...

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Old 10-05-2002, 12:21 PM
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You need a k-frame front end from a V8 car. I think the tranny is ok, cause my brother did this same swap in his Duster and I don't remember him swapping out the tranny. He got a V8 parts car and got the k-frame and disc brakes from it.
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Old 10-05-2002, 03:38 PM
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It's been a while but I think the tranny is different because of the engine angle, I was thinking it changed the location of the starter etc. I don't have my interchange manual at the house,it's at the shop, but any salvage yard worth a damn should be able to tell you if a bellhousing for a 318 and a six are the same.
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Old 10-05-2002, 06:36 PM
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Ok, the trannies will NOT work...and it is because of the angle of the slant six. My brother corrected me when I asked about the bellhousing. He told me that when you're talking autos, then its the case, bellhousings are on manuals.
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Old 10-07-2002, 08:23 AM
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are you guys sure, i heard a few people say that they have done the swap, they used the conversion motor mounts and used the same tranny/rearend.
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Old 10-07-2002, 08:54 AM
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[quote]Originally posted by purplePeopLEater:
<strong>are you guys sure, i heard a few people say that they have done the swap, they used the conversion motor mounts and used the same tranny/rearend.</strong><hr></blockquote>

Yes, I am sure about this information. My brother has a 73 Duster. I helped him do this same exact swap from a slant 6 to a 318.
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Old 10-08-2002, 03:52 PM
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thanks..... i needed to know before i got deep into the swap...
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Old 10-08-2002, 06:44 PM
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The slant six transmissions are different from the v-8 ones, as well as the small block trannys are different from the big block ones. .
You have to use a small block v-8 transmission.
You do not have to change the K member, however.
You can find a v-8 A body like yours, and whack the motor mounts out of it. Remove your mounts, bolt in your transmission, bolt the new mounts to your engine, and lower the engine down until the mounts are on the frame. Weld your new mounts down, (I would have your manifolds, or headers bolted up when you do it, so you don't get the engine too low in the chassis}it's pretty much this easy, you can change the k-member, but what a pain in the ars.
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Old 10-09-2002, 05:25 AM
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The 904 trans from the slant 6 will not work...

You need a 904 from an A motor... or a 727... Although, the driveshaft yoke will need to be changed if you go to a 727.

The K member only needs to be changed when going to a B or RB motor although, the original K member can be made to work with some trimming, reinforcement, and elephant Ears.

The 904 from a 318 should fit including the yoke and driveshaft.

While the rear may be a bit weak if you do much to the A motor, 8 3/4 units for A Bodies are still around in junk yards.
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Old 10-10-2002, 06:27 AM
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Schumacher makes motor V-8 mounts for /6 k-frames. The /6 trans won't work. The 8 1/4 rear will hold up to a street 318. For more info, go to <a href="http://www.moparts.com" target="_blank">www.moparts.com</a> - god site, lots of info you will need.

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