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Slant six 727 adapter/transmission question(s)
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Author:  Charrlie_S [ Wed Dec 11, 2019 7:51 am ]
Post subject:  Slant six 727 adapter/transmission question(s)
Early slant sixes did not have a 727 available, so an adapter was used in trucks. vans, and "fleet" vehicles, so a 727 trans could be used. Is this correct? What years was the adapter used? What application was the trans from?
Author:  Dart270 [ Wed Dec 11, 2019 8:00 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
Sorry I missed your call, Charlie. Voice is a bit weak today after a sore throat. My try you tonight.

67-down the plate was made/used. I think they were in vans, trucks, fleet/taxi/police vehicles. Probably not A-bodies as space would be very tight to the tunnel with a 1.125" plate and a bigger 727 in there. Seems like the ones I have seen were from A100s.

I still have mine. Think Wildcat had one for sale a while back.

Hope this helps,

Lou
Author:  drgonzo [ Wed Dec 11, 2019 8:04 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
I have a slant 727. Just sayin'.
Author:  Charrlie_S [ Wed Dec 11, 2019 8:33 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
I'm trying to determine what trans was used. Since the adapter has the small block trans bolt pattern (if i'm correct), but the 727 has the big converter pilot, and the LA small blocks had the small crank pocket (just like the slant), up untill 68, I don't know what 727 would have been used, unless it was from a "poly" motor. Does the "poly" small block have the same bellhousing bolt pattern as the LA engine, but have the large crank pocket?
Author:  Reed [ Wed Dec 11, 2019 10:15 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
Charlie-

I have one of those adpaters as well as gthe torque converter extension. The adapter has the smallblock bellhousing bolt pattern on one side and the low-mount starter slant bellhousing pattern on the other side. A bit of grinding is necessary to mount the starter on modern smallblock bellhousings (not sure why, but there is definitely interference).

As far as the torque converter extension is concenred, my understanding is that all but the last year of the adapter production used the small torque converter snout pocket. I know the adapter I have will fit into a 68-up slant flex plate center hole but the end that slips over the torque converter snout is for the smll size and needs to be machined out.

See here where I posted pictures of measurements of the torque converter spacer.
Author:  Charrlie_S [ Wed Dec 11, 2019 10:47 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
I'm still trying to determine what transmission Chrysler corp used "originally", back prior to 1968, on the slant six with the adapter. I'm thinking it could not be the same as the LA 727.
Author:  Joshie225 [ Wed Dec 11, 2019 3:28 pm ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
Charlie,

It is the LA pattern 727. The one I scored years ago was also in an A100 van and it had the same cable shifter A727 as if it had been built with a 273 or 318.
Author:  Charrlie_S [ Wed Dec 11, 2019 4:32 pm ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
I have been doing some more research. It looks like the 727 trans, was the one from the Poly "A" engines. The bellhousing bolt pattern is the same as the "LA" motors. Need to research the torque converters some more. There were two different converter/input shaft sizes. 1962-1965 used a small spline, and a big spline was fazed in during 1965. I have not found the actual size of the of the shaft or spline count of the early, small shaft. I also don't know what the converter pilot size was.

I know of a Mopar salvage yard about 50 miles from me. Pretty sure he would have a early 727 out of a car, that I could measure, the converter pilot and input splines. Will see if I can get there before Xmas.
Author:  Rick Covalt [ Thu Dec 12, 2019 3:13 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
What is the goal Charlie?
Author:  Charrlie_S [ Thu Dec 12, 2019 4:21 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
Quote:
What is the goal Charlie?
Just curious as to exactly what trans Chrysler used on the slant, with the adapter. That combo was used prior to the introduction of the "LA" (273-360) small block.
Some one made a statement, on another site, about a factory installation (no adapter) of a 273/727 in a early Barracuda. That made me think about how it could have been done (even though I had never heard of it, and don't think it ever existed). Every one states the "small block" 727 was used, with the adapter, but the adapter installs were done prior to the advent of what is commonly called the "small block". It looks to me like the 727 trans used on the slant with the adapter was from the Poly "A" motors. It looks like there are two different input shaft diameters and spline count on these (change coming in 1965), so the adapter installs would have been with the small size input shaft, at first. I do not know what size converter "nub" was used on those. I want to go measure a trans and converter, but that will have to wait untill after year end, as the wife of the owner of the salvage yard, just died about a week ago.

It really is not important, since the later "LA" transmissions work.
Author:  Tim Keith [ Sat Dec 14, 2019 7:57 pm ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
The pre-69 sweptline trucks have a bellhousing with bolt patterns for the slant six and "A" engine. I've read that the flathead six will also fit that bellhousing. I don't know this personally, although I do have a '61 D100.
Author:  bigslant6fan [ Sun Jan 19, 2020 6:09 pm ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
I am certain the "A" (poly) transmission was used. The bolt pattern between a and la motors are the same except for one bolt in the bell housing is different, and the starter mounts about 1/2 inch lower on the poly engine. I think this explains why grinding is needed to make the starter fit if a la transmission is used.
Author:  Dart270 [ Mon Jan 20, 2020 2:39 am ]
Post subject:  Re: Slant six 727 adapter/transmission question(s)
Ah, I always wondered this. Thanks, Charles! I just cut/ground mine and drilled an extra hole and it all worked fine.

Lou
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