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 Post subject: '61 sweptline 3 speed
PostPosted: Sun Jun 16, 2019 6:02 pm 
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My '61 D100 has a three speed manual transmission. Anyone know what gearbox it is?


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PostPosted: Mon Jun 17, 2019 5:20 am 
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We can probably Id it if you post a picture of it.

A few clues to help us..
Does it have a synchronized 1st gear?


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PostPosted: Mon Jun 17, 2019 7:39 pm 
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Truck isn't running. I'm hoping to switch to a stronger transmission. I figure there isn't much that will bolt to the cast iron bell housing. The transmission is a top loader and it has an iron case. I'll get a photo. I've read that a Borg Warner T-85 three speed was a heavy duty option but this doesn't look very strong.


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PostPosted: Tue Jun 18, 2019 4:11 am 
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I think the T-85 is a side-loader, so my guess is a 745.

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PostPosted: Tue Jun 18, 2019 5:33 am 
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Another clue can be the back.. does it have a slip yoke or trunion or does it have a u joint flange on the output?

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PostPosted: Tue Jun 18, 2019 6:48 pm 
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Transmission has a front u-joint like this : https://www.61-71dodgesweptlineparts.co ... on-yoke-2/


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PostPosted: Thu Jun 20, 2019 6:15 am 
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NO idea what a 3 speed top loader would be...

Assuming it is a Sweptline hydraulic clutch bell housing, Any New Process 420, 435, 445 or 540 should fit. Pre 1968 clutches were 8 or 10 coarse splined, later than that and the clutch was a fine spline 23 or something. Older style coarse splined clutches will likely need to be re-built, as modern day parts suppliers only have the later fine splined unit regardless of what they claim.


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PostPosted: Thu Jun 20, 2019 9:47 am 
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Its hydro clutch on cast iron bell housing. The speedometer cable connects to the top of the transmission cover. A NP435 would be a reasonable choice. I'd like the NP445 (4350) but these can be hard to find and some parts are no longer available - if I find one in good shape that's what I'd like to use. I also have three aluminum case NP833 O/Ds from D150s, a cast iron A-body 833, an AX15 and a Toyota W58. Its good to know the b/h can accept an easy to find NP435 - not wanting the granny gear but its much stronger than the 3 speed.


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PostPosted: Thu Jun 20, 2019 11:21 am 
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I have a NP 445 sitting here for my M37 conversion, and would really like to use it, but creating a stub shaft to connect with the Transfer case has been more difficult than I imagined... IT IS an ideal road transmission.. and I am coming under a time crunch that may force the quick answer of a NP 435 going into it's place in the truck. LMK if you are interested..

Also I have read that some NP 435's have a close ratio gear spacing which takes place of the granny gear, and the long drop in RPM's between 3rd and 4th. Never seen one, but I am still new to this game, and learning my way around.


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PostPosted: Thu Jun 20, 2019 4:45 pm 
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The transmission that I have is probably not the A745 - those have a hump on the top cover. Doesn't matter too much because I want something better. I believe the door tags on sweptline trucks identify the transmission type.


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PostPosted: Thu Jun 27, 2019 10:11 am 
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It could also be an A903, which if I recall has a synchronized 1st gear.

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PostPosted: Fri Jul 26, 2019 11:34 pm 
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I don't think anyone has swapped an AX-15 to a truck. You can
exchange the internals of a R-154 into an AX-15 if you have them.
I think the AX15 would work well with a truck. The oem version was
rated at 280 lb ft torque capacity, good for a slant six. Aisin produces
a replacement AX15 which is stronger - I don't know what parts are
upgraded, but parts are available. I have the slant six to small block
adapter but I don't think I'd use it as it spaces the transmission further
from the block, requiring a longer input shaft.

https://www.driftmotion.com/New-R154-Tr ... dm3513.htm


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