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727 swap?
Posted: January 6th, 2009, 1:32 pm
by John
Has anyone swapped a AMC pattern 727 to a 4.0. If so what flex plate did you use?
I am looking at using a one from a 91-95 YJ auto, then drilling the housing for the cps. This is going to a 94 YJ, trying to use YJ starter and keep from using the CPS relocation bracket.
John
Re: &@& swap?
Posted: January 6th, 2009, 6:14 pm
by John
That was supposed to be a 727 swap heading
John
Re: &@& swap?
Posted: January 7th, 2009, 8:54 am
by amcinstaller
asked on another forum, should be fine, all they said was mate the flexplate to the starter. different teeth from 258 to 242 starters. but you knew that already
Re: 727 swap?
Posted: July 8th, 2009, 4:01 pm
by Biggrnjeep97
Doing the same swap in my TJ. Used a notched balancer/sensor kit from Advance Adapters so i wouldnt have to play games in the bellhousing with a drill.
Re: 727 swap?
Posted: April 5th, 2011, 4:13 pm
by Mr.Mopar
I'm performing this swap. I just discovered today that the bolt pattern on the flexplate is different then the bolt pattern on the 727 TC.
Is their a 4.0 flexplate that can be used to work with the 727 and be neutral balanced?
Thanks
Re: 727 swap?
Posted: April 5th, 2011, 6:49 pm
by amcinstaller
i would think use the one from the 727, and move the cps to the balancer for the whatever dollars for that thing
youll have to use a different starter too i think, and perhaps a solenoid, depending.
Re: 727 swap?
Posted: April 5th, 2011, 9:03 pm
by Mr.Mopar
I don't have a spare flexplate. The one I have is balanced to my 343.
I was hoping to keep this swap simple and find a certain year 4.0 flexplate that will work with my 727 and be able to use the stock CPS.
Thanks
Re: 727 swap?
Posted: April 6th, 2011, 4:50 am
by zebracar1
I droped a 94 4.0 into a 83 cj7 with the 727. I just used the 4.0 flexplate and it bolted right to the converter with no problems. I cut a slot in the bellhousing and made my own cps braket. just adjusted it till it ran good. Hope this helps.
Re: 727 swap?
Posted: April 6th, 2011, 3:55 pm
by Mr.Mopar
The flexplate needed to bolt up to a 727 is from 1991-1996. It was used on the 42RE Transmission.
Part #53006328.
Re: 727 swap?
Posted: April 6th, 2011, 3:58 pm
by Mr.Mopar
Having the new flexplate match balanced to the original flexplate. I don't wanna take any chances since im not 100% sure.
Back to modifying the bellhousing for the CPS!
Re: 727 swap?
Posted: April 6th, 2011, 7:23 pm
by SilverXJ
Why would you have it match balanced to the old flex plate? Why not just balance the flex plate on its own w/o matching it? The engine is internally balanced so you want the external components neutral balanced as much as possible.
Re: 727 swap?
Posted: April 10th, 2011, 9:41 pm
by Mr.Mopar
i didn't know. I'm new to the 4.0. I can't remember the exact # but it wasn't out by much.