Author Topic: 727 4x4 overdrive?  (Read 1418 times)

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Offline pilgrim 90

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727 4x4 overdrive?
« on: September 10, 2011, 08:06:42 AM »
i was courious if any one knew if there was a overdrive unit that would work on a 727 with a np241 transfercase ???

Offline ToxicDoc

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Re: 727 4x4 overdrive?
« Reply #1 on: September 10, 2011, 08:47:02 AM »
Yeah, it's called the 518 transmission.  Internally the same as the 727 with the added overdrive.  That's the best way since you retain oem parts and stuff bolts right up to it.  There's also the Gear Vendors overdrive unit, but I know little about that.
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Offline pilgrim 90

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Re: 727 4x4 overdrive?
« Reply #2 on: September 10, 2011, 09:24:48 AM »
ok cool ;D thank you. the 518 sounds like the way to go. so are these tranny's in the 90's trucks? and how will i be able to recognise one?

Offline ToxicDoc

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Re: 727 4x4 overdrive?
« Reply #3 on: September 10, 2011, 09:58:56 AM »
Yeah, they're on the early 90's trucks.  They look like a longer 727, but I am a manual-tranny guy so for more info I'll leave it to the other members to answer.
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Offline DODGEBOYS

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Re: 727 4x4 overdrive?
« Reply #4 on: September 10, 2011, 11:40:59 AM »
look for a 1988 to 1993 full-size truck with the OD button in the dash or a 1988 to 1996 Dakota V8 with the OD button on the dash

NOTE / you hafta know the difference between a 904 - 500 and a 727 - 518 to find the right tranny
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Offline 440 4spd Power Ram

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Re: 727 4x4 overdrive?
« Reply #5 on: September 10, 2011, 11:46:12 AM »
'90-93 full-sized 4X4s used the A-518 without lockup, the '92-93 Dakota V8s used the same trans with lockup, '94 & '95 46RH will also work.

Offline pilgrim 90

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Re: 727 4x4 overdrive?
« Reply #6 on: September 10, 2011, 03:58:37 PM »
sweet  :D thank you verry much for the info. will there be many mods? like new driveshafts and a fabed up tranny mount?

Offline hp383

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Re: 727 4x4 overdrive?
« Reply #7 on: September 10, 2011, 04:12:57 PM »
Yes both drive shafts, since you are moving the transfer case back. Relocation of the crossmember, also keep in mind this 727 to 518 only works "easily" if you are using a small block. There are no big block 518's. There are a few ways to make them fit, but it is expensive, and requires time and fabrication.
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Offline pilgrim 90

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Re: 727 4x4 overdrive?
« Reply #8 on: September 10, 2011, 04:24:15 PM »
my truck is a 360 from an old n.h. school bus so there shouldnt be any problem there. cool sounds like i better start finding one for a winter rebuild.
 thank you

Offline mcritch

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Re: 727 4x4 overdrive?
« Reply #9 on: September 10, 2011, 04:34:19 PM »
my truck is a 360 from an old n.h. school bus so there shouldnt be any problem there. cool sounds like i better start finding one for a winter rebuild.
 thank you

be careful rebuilding the overdrive in one - the internals are the same as a 727 but the OD unit has a gnarly spring under a lot of pressure. they make a couple of spring compressors (one uses a press, one bolts to the housing) to handle the job of reinstalling it.


1987 Ramcharger LE 150 4x4 - 318/AVS & Edelbrock Performer intake/727/HEI/Borla Exhaust - 300k & still rolling
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Offline pilgrim 90

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Re: 727 4x4 overdrive?
« Reply #10 on: September 10, 2011, 05:30:25 PM »
would that tool be hard to find? it kinda sounds spacific to the job ???

Offline DODGEBOYS

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Re: 727 4x4 overdrive?
« Reply #11 on: September 10, 2011, 05:46:40 PM »
unless the OD is shot it almost never needs to be rebuilt
put your truck info HERE
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Offline mcritch

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Re: 727 4x4 overdrive?
« Reply #12 on: September 10, 2011, 07:57:54 PM »
would that tool be hard to find? it kinda sounds spacific to the job ???


you can get either type of them here -

http://www.transmissioncenter.net/Tools.htm

one is part number 91-ODD

the other is part number 91SC



1987 Ramcharger LE 150 4x4 - 318/AVS & Edelbrock Performer intake/727/HEI/Borla Exhaust - 300k & still rolling
1993 D250 LE CTD/ASA Intake, 8' bed.  Stock....for now....

Offline mopowerphil

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Re: 727 4x4 overdrive?
« Reply #13 on: September 10, 2011, 09:28:36 PM »
Or if you want one allready rebuilt then I have one . I should be done removing it from the truck within the next couple of week's . I think I still have the drive shaft's you'll need to . I'm on the south shore ( kinnda ) if your interested .  ;D

 

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