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Old 01-08-2009, 01:40 AM   #1
Wolf360rt
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Default 727 Swap

Hey guys I just happen to have a small block 727 trans and a trans break just taking up space in my Garage and I know the 727 will bolt up to the Magnum block but, what else it needed as in the Flex Plate, converter and computer. And ive heard that your ET will drop by almost a second due to the lack of the rotating mass of the OD unit is this true? I also have a full race ready 8-3/4 axle with 4.56 gears and a full locker just sitting around and its wide enough to fit under the truck I dont give a damn about not having 6 bolt on the truck anymore. So What do you guys think should I do it or what?
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Old 01-08-2009, 01:50 AM   #2
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Just made that swap...Dropped 5 tenths the fist time down the track, but I was coming from a very good 46RE. I know I have room for improvement with the 727.

You'll need a longer drive shaft, and a different tranny mount, and you will have to notch the trans case for the Crank trigger, and get the auto flashed out of the PCM...CELs will still be your friend.
For strip, with limited street, do it. But the 4.56 gears and a 3 speed gonna get old if you spend much time over 60 mph.
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Old 01-08-2009, 02:02 AM   #3
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The truck is most likely gonna become an around town screw around toy so it wont spend much time above 60 unless im messing with someone..lol... and it wouldnt take much to swap out the 4.56 for something smaller.. Ive honestly never had the trans out of my truck myself to look at it is notching it a pretty easy job.. and does anyone sell the trans mount or is it something im gonna have to fab up.. Who can reFlash the pcm for me I have the performance pcm and dont wanna pay $450 for another one if I dont have to.
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Old 01-08-2009, 04:58 AM   #4
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Quote:
Originally Posted by Adobedude View Post
Just made that swap...Dropped 5 tenths the fist time down the track, but I was coming from a very good 46RE. I know I have room for improvement with the 727.

You'll need a longer drive shaft, and a different tranny mount, and you will have to notch the trans case for the Crank trigger, and get the auto flashed out of the PCM...CELs will still be your friend.
For strip, with limited street, do it. But the 4.56 gears and a 3 speed gonna get old if you spend much time over 60 mph.
isn't there 727's out there with extra long tail shafts? i thought about a 727 when i had my trans done but my DS is long enough as it is.
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Old 01-10-2009, 10:38 PM   #5
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if i remember right your have 3 diff. 727 tailshaft, you have a short, med. length one, and the long tail shaft.
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Old 01-11-2009, 08:08 AM   #6
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I was running a 727 but then changed to a built 904. I think I picked up a little more rwhp just from it being a lighter mass just like everyone was saying but if you are buying new I would recomend the 904. Mine was built and dynoed tested at 750 hp so I will last me a while. It had a trans brake in it but the guy who bought it new kept it for his new upgraded trans.
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Old 01-11-2009, 10:42 PM   #7
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heres some pics
short:

med:

long:
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Old 01-12-2009, 01:57 AM   #8
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Quote:
Originally Posted by red R/T View Post
heres some pics
short:

med:

long:
nice

anyone know the lengths of those compaired to the 46RE/RH's?
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Old 01-12-2009, 11:34 PM   #9
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med length tailshaft is 20in and the long tailshaft is 26in

i'll measurements for the 46re and the short tailshaft tomorrow
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Old 01-12-2009, 11:47 PM   #10
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What Flex plate and converter will I have to run with this setup.. can I use the stock flex plate, and just a standard 727 converter.. and does the speedo read off the trans or the rear end or our trucks off the abs ring...
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