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727 compatibility between B and D series

Old 02-08-2019, 12:57 PM
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727 compatibility between B and D series

Hi guys,

I've got a 1977 D100 short bed with the 318 and the A833 4 speed. The gearbox is in dire need of a rebuild as it really isn't oil tight anymore; rearmost seal at the tail leaks like a sieve! Plus fourth whines louder inside the cab than there is engine noise. I have no problem rebuilding that unit, but I'm thinking along the lines of making it more practical to tow a light payload and just generally make it easier to get around with. Stock truck for all intents.

I'm strongly considering doing the swap over to a 727 and am currently looking for the cheapest lock-up doners I can in the latest models I can get away with, under the assumption that if I could get away with say an '88 transmission, some of the early lock-up bugs from 10 years earlier would have been worked out. Is that in any way an accurate assumption to have? Are the lock-up units from this era really worth perusing over a standard 1977 727?

The intent is to do a master rebuild, including a shift-fix kit.

Locating on car-part.com I see doners in the range of 82-88 for Dodge 150 and 250 vans with 318s. I think I've been able to verify that these should be long output. Cost is $200

Are the 150 or 250 van transmissions compatible with the D series trucks? So long as it has a long output and engine matches?

Thank you for any input!

-Nicholas
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Old 02-08-2019, 01:01 PM
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Why not go with a 518 overdrive?
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Old 02-08-2019, 01:13 PM
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Originally Posted by Iowan View Post
Why not go with a 518 overdrive?
I'd like a direct replacement without needing to mod mounting points or shorten the drive line. I understand I need to grab the throttle linkages as well, but I'd prefer not to modify the drive line if I can avoid it. I'm also trying to keep costs down as this truck wasn't maintained very well before I got it, so I'm having to sink a little money in to several points.
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Old 02-08-2019, 01:20 PM
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Where are you located?
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Old 02-08-2019, 01:31 PM
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Originally Posted by Iowan View Post
Where are you located?
Portland, Oregon.
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Old 02-08-2019, 01:37 PM
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Just wondering, I've got a rebuild 727 from a 77 pu in my shed I wouldn't mind getting rid of.
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Old 02-08-2019, 01:43 PM
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On the lockup converter transmission I've always avoided them so I can't help there. But if I was going to bother with a swap I'd go 518 and overdrive.
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Old 02-08-2019, 03:54 PM
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Originally Posted by Iowan View Post
On the lockup converter transmission I've always avoided them so I can't help there. But if I was going to bother with a swap I'd go 518 and overdrive.
Understood, thanks. Are you aware if the 727 from a B150 or 250 van would fit in the truck, regardless of it's lock-up design?

I'll look a bit more in to the 518 options.

Also, what doner vehicle would you suggest for a 518? Doing one's own homework is fun.

[color=start=#333333]You can locate the A-518/46RH transmissions in these donor vehicles:[/color]
  1. 1990-'95 Dodge van with a 318 or 360 engine
  2. 1992-'95 Dakota with a 318 engine
  3. 1990-'91 Ramcharger with a 318 or 360 engine
  4. 1990-'95 Dodge pickup two-wheel drive (1/2- through 1-ton) with a 318 or 360
(Source: https://www.hemmings.com/magazine/mu...n/1301453.html )

Last edited by NicholasDM; 02-08-2019 at 04:03 PM.
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Old 02-08-2019, 04:15 PM
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I was looking the the other day for 1300 you can get trans and converter. But it seems like you could find a good use transmission, the controller isn't to bad.
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Old 02-08-2019, 04:41 PM
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Old 02-11-2019, 09:35 PM
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should be loads of 727 SB trans out there Van pick up both basically the same
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