Swapping Tranny...

71RR08 · 08-20-2008, 08:34 PM

i was thinking of swapping trannys, i have 440 engine (RV) and i have a 727 torqueflite on a 71 400 block, is it possible to take the 727 and put it on the 440?? should fit right?? and is it possible to do it myself? how difficult is it?

71RR08 · 08-20-2008, 08:34 PM

oh its in a 71 RoadRunner!!!!

Doc · 08-20-2008, 10:46 PM

Yes ...it will swap. But you might have to use the 440 converter in the 400 trans.

Doc · 08-20-2008, 10:54 PM

Hey 71 ....I am going to need a clearer pic of that tail housing of the trans.

71RR08 · 08-20-2008, 11:21 PM

ok ill take a pic tomorrow morning, how hard is it to switch the converter? fun huh? lol im always willing to learn...lol

Commando · 08-21-2008, 05:14 AM

Hey Doc correct me if I am wrong but isn't the way the trans is balanced differently between the two. I think one is external and the other is internally balanced? Just something I heard while I was getting answers to my questions about my 400 and 440.

Also the converter isn't difficult to swap, you just have to unbolt it from the flexplate.

71RR08 · 08-21-2008, 12:28 PM

right, the trans i have on the 440 is good, the only thing its too short to mount up where the original transmission mount holds it up, cuz the torqueflite transmission is longer and the one on the 440 is short....if i leave the 440 one on there, im gonna have to get a new driveshaft.......whooh!

71RR08 · 08-21-2008, 12:36 PM

this is a pic of the end of the trans... see how its sitting on the mount? the old trans went through and that mount, bolted up to the neck of the trans, i dont know how to bolt up the new trans since its short!

Doc · 08-21-2008, 02:46 PM

Quote:

Originally Posted by Commando

Hey Doc correct me if I am wrong but isn't the way the trans is balanced differently between the two. I think one is external and the other is internally balanced? Just something I heard while I was getting answers to my questions about my 400 and 440.

Also the converter isn't difficult to swap, you just have to unbolt it from the flexplate.

C-guy .... the steel crank has a ZERO balanced converter. The cast cranks have an offset balanced converter.

Converter swap? ... but you have to PULL the trans tooooo !

Doc · 08-21-2008, 02:50 PM

71 ...the pic is not really that clear BUUTTTT it looks like you have a bolt-on driveshaft. Do you still have that 400 trans ? Is it any good?

71RR08 · 08-21-2008, 05:11 PM

yea i have that trans, i decided to put the 400 trans on, on the 440 trans i unbolted everything but im having a hard time sliding it out!, theres no bolts i have to untighten inside to slide the trans out right? kinda sucks cuz i dont have a lift, just jacks....fun times...

71RR08 · 08-21-2008, 06:35 PM

pulled the 440 trans out...now to put in the 400 trans...i kept the 440 converter ...

Commando · 08-21-2008, 06:48 PM

Oh ok, thanks Doc, I never looked too far into it as I bought the pair from the same car.

71RR08 · 08-21-2008, 06:58 PM

hey anyone know where the transmission lines run to? i think i have 3 coming off the 400, they were snipped so i have to replace them....

challenger · 08-21-2008, 10:12 PM

as far as i know you only have two tranny lines and they go to your radiator but as far as the third one i guess im lost as i have never seen a third one

Doc · 08-22-2008, 12:59 AM

If you are looking at just getting it running ... putting a hose between thew two lines is not a problem. BUT ...do not try running it that way on the street.

Commando · 08-22-2008, 05:06 AM

Hey 71, are the three lines the same size? I can take a look at my setup in the car to see whats up with my 400 and 727, and do a quick look at the other trans for the 440 and let you know, but won't be able to look until later today.

ef8340 · 08-22-2008, 11:26 AM

hey 71 im guessing yer kinda new at this did you make sure the converter was fully in before you mounted it(converter will make acouple of clicks as you turn and kinda lift up on the converter on the shaft then when attaching it to the the flex plate on the motor there will be a space inbetween the too but when you bolt it up it will pull together and still be okay and replaced the frt seal aint nothin worse than doin all that work then it leaks or dont even go asfar as the t. lines goe you should only have two you can take the lines that you have and splice them together in order to make trans lines that go to the rad. you'll need some compression fittings a pipe cutter and some sand paper 120 grit or alittle higher so that the fittings will seal get some line wrenches so you can tighten and loosen this stuff without damaging it kinda lost on the 3rd trans line unless you are refering to the speedo cable?
goodluck

Doc · 08-22-2008, 06:14 PM

71 ... ef makes a good point .... make sure the converter is engaged into the pump before install. You can check by being able to spin the converter when the trans is bolted-UP to the engine. If the converter hub is not properly engaged into the pump ...it will not spin.

72 DEMON · 11-25-2008, 06:40 PM

in mopar world there are big block trannys and small block trannys everything else you run across is petty stuff

08-20-2008, 08:34 PM	#1 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	Swapping Tranny... i was thinking of swapping trannys, i have 440 engine (RV) and i have a 727 torqueflite on a 71 400 block, is it possible to take the 727 and put it on the 440?? should fit right?? and is it possible to do it myself? how difficult is it?

08-21-2008, 05:14 AM	#6 (permalink)
Commando Senior Member Join Date: Nov 2007 Location: New Jersey Posts: 423	Hey Doc correct me if I am wrong but isn't the way the trans is balanced differently between the two. I think one is external and the other is internally balanced? Just something I heard while I was getting answers to my questions about my 400 and 440. Also the converter isn't difficult to swap, you just have to unbolt it from the flexplate. Last edited by Commando; 08-21-2008 at 05:17 AM.

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08-20-2008, 08:34 PM	#2 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	oh its in a 71 RoadRunner!!!!

08-20-2008, 10:46 PM	#3 (permalink)
Doc MasterDebater Join Date: Jun 2008 Location: nw lower Meeeechigan Posts: 673	Yes ...it will swap. But you might have to use the 440 converter in the 400 trans.

08-20-2008, 10:54 PM	#4 (permalink)
Doc MasterDebater Join Date: Jun 2008 Location: nw lower Meeeechigan Posts: 673	Hey 71 ....I am going to need a clearer pic of that tail housing of the trans.

08-20-2008, 11:21 PM	#5 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	ok ill take a pic tomorrow morning, how hard is it to switch the converter? fun huh? lol im always willing to learn...lol

08-21-2008, 12:28 PM	#7 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	right, the trans i have on the 440 is good, the only thing its too short to mount up where the original transmission mount holds it up, cuz the torqueflite transmission is longer and the one on the 440 is short....if i leave the 440 one on there, im gonna have to get a new driveshaft.......whooh!

08-21-2008, 12:36 PM	#8 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	this is a pic of the end of the trans... see how its sitting on the mount? the old trans went through and that mount, bolted up to the neck of the trans, i dont know how to bolt up the new trans since its short!

08-21-2008, 02:50 PM	#10 (permalink)
Doc MasterDebater Join Date: Jun 2008 Location: nw lower Meeeechigan Posts: 673	71 ...the pic is not really that clear BUUTTTT it looks like you have a bolt-on driveshaft. Do you still have that 400 trans ? Is it any good?

08-21-2008, 05:11 PM	#11 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	yea i have that trans, i decided to put the 400 trans on, on the 440 trans i unbolted everything but im having a hard time sliding it out!, theres no bolts i have to untighten inside to slide the trans out right? kinda sucks cuz i dont have a lift, just jacks....fun times...

08-21-2008, 06:35 PM	#12 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	pulled the 440 trans out...now to put in the 400 trans...i kept the 440 converter ...

08-21-2008, 06:48 PM	#13 (permalink)
Commando Senior Member Join Date: Nov 2007 Location: New Jersey Posts: 423	Oh ok, thanks Doc, I never looked too far into it as I bought the pair from the same car.

08-21-2008, 06:58 PM	#14 (permalink)
71RR08 Member Join Date: Mar 2008 Posts: 33	hey anyone know where the transmission lines run to? i think i have 3 coming off the 400, they were snipped so i have to replace them....

08-21-2008, 10:12 PM	#15 (permalink)
challenger Super Moderator Join Date: Jul 2008 Location: MICHIGAN Posts: 427	as far as i know you only have two tranny lines and they go to your radiator but as far as the third one i guess im lost as i have never seen a third one

08-22-2008, 12:59 AM	#16 (permalink)
Doc MasterDebater Join Date: Jun 2008 Location: nw lower Meeeechigan Posts: 673	If you are looking at just getting it running ... putting a hose between thew two lines is not a problem. BUT ...do not try running it that way on the street.

08-22-2008, 05:06 AM	#17 (permalink)
Commando Senior Member Join Date: Nov 2007 Location: New Jersey Posts: 423	Hey 71, are the three lines the same size? I can take a look at my setup in the car to see whats up with my 400 and 727, and do a quick look at the other trans for the 440 and let you know, but won't be able to look until later today.

08-22-2008, 11:26 AM	#18 (permalink)
ef8340 Senior Member Join Date: Jun 2008 Posts: 175	hey 71 im guessing yer kinda new at this did you make sure the converter was fully in before you mounted it(converter will make acouple of clicks as you turn and kinda lift up on the converter on the shaft then when attaching it to the the flex plate on the motor there will be a space inbetween the too but when you bolt it up it will pull together and still be okay and replaced the frt seal aint nothin worse than doin all that work then it leaks or dont even go asfar as the t. lines goe you should only have two you can take the lines that you have and splice them together in order to make trans lines that go to the rad. you'll need some compression fittings a pipe cutter and some sand paper 120 grit or alittle higher so that the fittings will seal get some line wrenches so you can tighten and loosen this stuff without damaging it kinda lost on the 3rd trans line unless you are refering to the speedo cable? goodluck

08-22-2008, 06:14 PM	#19 (permalink)
Doc MasterDebater Join Date: Jun 2008 Location: nw lower Meeeechigan Posts: 673	71 ... ef makes a good point .... make sure the converter is engaged into the pump before install. You can check by being able to spin the converter when the trans is bolted-UP to the engine. If the converter hub is not properly engaged into the pump ...it will not spin.

11-25-2008, 06:40 PM	#20 (permalink)
72 DEMON Junior Member Join Date: Sep 2008 Posts: 2	in mopar world there are big block trannys and small block trannys everything else you run across is petty stuff