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PostPosted: Thu Feb 09, 2017 7:03 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
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Location: Fircrest, WA
Car Model*: 76 D100
I see no reason to put a 727 behind a slant on a daily driver, even one that does a lot of towing or hauling. My 1976 Dodge truck has a 225/727 combination and I plan on swaping out the 727 for a 904. The earlier and lighter A100 truck or van chassis would do just fine with a 904. The slant six 904T actually has a four gear planetary gearset and the same number of clutches as V-8 transmissions.

And the factory adapter plate was dropped in 68 when Chrysler came out with the slant six case for the 727. The adapter is only found in 64-67 A100/A108 trucks and vans. The coolest combination of factory parts is a 225 with the adapter plate mating it to an A500 four speed auto with overdrive.


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PostPosted: Mon Mar 06, 2017 3:05 pm 
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Reed wrote:
I see no reason to put a 727 behind a slant on a daily driver, even one that does a lot of towing or hauling. My 1976 Dodge truck has a 225/727 combination and I plan on swaping out the 727 for a 904. The earlier and lighter A100 truck or van chassis would do just fine with a 904. The slant six 904T actually has a four gear planetary gearset and the same number of clutches as V-8 transmissions.

And the factory adapter plate was dropped in 68 when Chrysler came out with the slant six case for the 727. The adapter is only found in 64-67 A100/A108 trucks and vans. The coolest combination of factory parts is a 225 with the adapter plate mating it to an A500 four speed auto with overdrive.


It would become very apparent why you have install a 727 in a SWB A100. The transmission cannot exceed 22" in length. The only options for a short shaft are in the 727.

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64 Dodge A100, 65 Dodge A100 Sportsman, 67 Dodge A100 Sportsman


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PostPosted: Mon Mar 06, 2017 3:18 pm 
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"The earlier and lighter A100 truck or van chassis would do just fine with a 904. The slant six 904T actually has a four gear planetary gearset and the same number of clutches as V-8 transmissions."

wow....again, the A100 truck/van chassis cannot fit the 904 due to drive shaft length limitations. ONLY the A108 van could put in the 904. All in the hopes to gain back a possible...what, 15% (maybe) power loss compared to a 727??? I'm sure the other model trucks in the line would have no issues with the extra 4" of tail shaft that the A100 does.

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64 Dodge A100, 65 Dodge A100 Sportsman, 67 Dodge A100 Sportsman


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 Post subject: Correct...
PostPosted: Mon Mar 06, 2017 5:13 pm 
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Location: Salem, OR
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Quote:
It would become very apparent why you have install a 727 in a SWB A100. The transmission cannot exceed 22" in length. The only options for a short shaft are in the 727.


Oddly this issue is even noted in the old Carroll Shelby version of the Direct Connection Chassis Manual... LOL....

Although I had heard a rumor at one time that AMC's version of the 904 came with a slightly shorter tailshaft than the Mopar version (not sure if the mainshaft is compatible with the mopar yoke or guts....


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 Post subject:
PostPosted: Mon Mar 06, 2017 7:50 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
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Location: Fircrest, WA
Car Model*: 76 D100
I stand corrected. Having never owned or worked on euther an A100 or an A108, I was not aware of the lack of space for a 904. However, I stand by my recommendation of a 904 over a 727, provided there is space for it.


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PostPosted: Mon Mar 06, 2017 8:34 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6179
Location: So California
Car Model*: 64 Plymouth Valiant
Is the space a hump or driveshaft length problem?

If driveshaft length, I would think you could use high angularity u-joints or CV joints and have a short driveshaft.

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

8)


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 Post subject:
PostPosted: Mon Mar 06, 2017 10:02 pm 
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Supercharged
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Location: Fircrest, WA
Car Model*: 76 D100
I do know that a b series van transmission bracket can be adapted to the A series body.


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 Post subject: Transmission length
PostPosted: Mon May 29, 2017 12:37 am 
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4 BBL ''Hyper-Pak''
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Joined: Thu Dec 22, 2005 11:04 pm
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Location: Merritt,British Columbia
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A full length 727 will fit an A100 with the 90 inch WB
I have a full length ( same as a 727 ) 833 OD in my 65 A100 pickup .
have owned 12 A100's and A108's . Not sure where Bionic is getting his info , I have pics if need be .


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PostPosted: Sun Jun 28, 2020 10:40 pm 
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4 BBL ''Hyper-Pak''

Joined: Sun Jun 05, 2016 12:18 pm
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Location: San Diego Ca
Car Model*: 1965 Dodge A100 Pickup w/Super Six
Is your 833 in your A100 a four speed plus overdrive? Or is fourth gear OD? Also, column shift?


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PostPosted: Mon Jun 29, 2020 2:27 pm 
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Turbo Slant 6

Joined: Thu Jun 07, 2012 4:29 pm
Posts: 579
Location: Houston
Car Model*: 68 Valiant
A 904 might have the same number of clutches and planetary gears as a 727, but they are way smaller diameter. There is a relationship fully understood only by the highly educated, and Keaneu Reeves, which speaks to the fact that clutch holding strength goes up exponentially with diameter.

Now, who wanted the short 727....?


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PostPosted: Tue Jun 30, 2020 8:08 am 
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4 BBL ''Hyper-Pak''

Joined: Mon Apr 04, 2005 5:28 pm
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Location: Vernon,WI
Car Model*: 1966 Plymouth Valiant
keep in mind the a100/108 trans mount is on the Top. unless you are making a crossmember or a custom mount bracket ( some have bolted to the tail housing bolts ) a standard car trans wont work.


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PostPosted: Tue Jun 30, 2020 2:10 pm 
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Supercharged
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Location: Fircrest, WA
Car Model*: 76 D100
GregCon wrote:
A 904 might have the same number of clutches and planetary gears as a 727, but they are way smaller diameter. There is a relationship fully understood only by the highly educated, and Keaneu Reeves, which speaks to the fact that clutch holding strength goes up exponentially with diameter.

Now, who wanted the short 727....?


But is the added clutch holding strength (a) necessary and (b) worth the tradeoff in overall drivetrain efficiency over a 904? I stand by my assertion that in most applications there is no reason to put a 727 behind a slant six.


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PostPosted: Tue Jun 30, 2020 2:42 pm 
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Turbo Slant 6

Joined: Thu Jun 07, 2012 4:29 pm
Posts: 579
Location: Houston
Car Model*: 68 Valiant
I agree, the 727 is overkill x 5 for the average Slant.


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PostPosted: Wed Jul 01, 2020 8:45 am 
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EFI Slant 6
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Reed wrote:
I stand by my assertion that in most applications there is no reason to put a 727 behind a slant six.


Well there obviously is, otherwise Mopar wouldn't have done it now would they???


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PostPosted: Wed Jul 01, 2020 9:22 am 
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Supercharged
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Posts: 12612
Location: Fircrest, WA
Car Model*: 76 D100
69a100 wrote:
Reed wrote:
I stand by my assertion that in most applications there is no reason to put a 727 behind a slant six.


Well there obviously is, otherwise Mopar wouldn't have done it now would they???


Yes, but the reason most likely wasn't because of concerns for longevity or technical necessity. My 1976 D100 was built with a 225 and a 727. But that was because Dodge did not offer 904s in any trucks or vans that year, no matter the engine or package ordered. Just a few years later in the early 80s Chrysler was putting 904s and 999s behind smallblock engines in trucks and vans without any significant changes in the design of the engines or transmissions.


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