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1970 318 mating to 1963 727

Posted By: MoPar

1970 318 mating to 1963 727 - 12/17/17 01:27 AM

Checking to see if the bolt pattern is the same to mate them together, the 4 common trans to block bolts line up, the bolt that is near the aligning dowel on the drivers side does not line up to the trans threaded hole, the same bolt on the other side behind the oil filter does line up, any ideas ?
Posted By: stumpy

Re: 1970 318 mating to 1963 727 - 12/17/17 01:56 AM

Will the flex plates and converters swap?
Posted By: MoPar

Re: 1970 318 mating to 1963 727 - 12/17/17 02:20 AM

I will try to add a picture, the left hole is the aligning dowel and the middle hole and the right hole should line up.

Attached picture 20171216_180150.jpg
Posted By: TJP

Re: 1970 318 mating to 1963 727 - 12/17/17 04:03 AM

The LA style motors will bolt up to the earlier trans and flex plate / converter.
Posted By: buildanother

Re: 1970 318 mating to 1963 727 - 12/17/17 04:28 AM

How about the converter register size, Different?
Posted By: therocks

Re: 1970 318 mating to 1963 727 - 12/17/17 04:30 AM

They will bolt up as said.IIRC one bolt wont line up.I think the register is different but works.Did it morethan once.Rocky
Posted By: MoPar

Re: 1970 318 mating to 1963 727 - 12/17/17 01:35 PM

Would it be necessary to drill and tap the trans to utilize the block hole that doesn't line up ?
Posted By: MoPar

Re: 1970 318 mating to 1963 727 - 12/17/17 01:49 PM

Here is what I should have put in the original post, have a 63 Fury with original drivetrain, the 318 poly was bad so I'm putting in a 70 318 and using the original 727 cable shift trans, the flex plate and torque converter are the originals to the 63. The flex plate, crank, and torque converter all bolted together fine, the block to trans bolted up fine except the bolt below the aligning dowel on the drivers side. As far as the torque converter register to crank goes I don't know as it seemed to go together ok.
Posted By: RapidRobert

Re: 1970 318 mating to 1963 727 - 12/17/17 04:30 PM

I think the register hole in the crank & the TC nub were enlarged in ~68 or so & you can use the later crank/early trans (like you are doing) but not the other way around & the gap may or not be OK as is but I think people have done it & there was an article in a van magazine where in addition they cut some slits in the flexplate so it would flex & not wear out the pump bushing (iirc, not sure, I have it somewhere). Doug Dutra of the old /6 club of America used to machine a spacer to take up that space & later wildcat auto was selling em (not sure if it is needed & or the /6 one is the same as the V8 one) but it must be desireable otherwise it would not have been fabbed by several individuals. I have one if you need dimentions.
Posted By: Cab_Burge

Re: 1970 318 mating to 1963 727 - 12/17/17 08:53 PM

You need to measure both the crank hole I.D. and the O.D. of the converter hub, very little clearances(.008 to maybe .015) are needed, no slop allowed tsk scope If it has a lot of clearance you can have a bushing made to slip on the converter hub to get it back to factory specs. up scope
The crank hub aligns and holds the converter and centers it so it won't wipe out the front pump bushing and seal work It needs to be correct, not loose thumbs
Posted By: John_Kunkel

Re: 1970 318 mating to 1963 727 - 12/17/17 11:19 PM

All 727 converter pilot hubs are the same 1.81" diameter. The Poly motor trans case has one hole that won't match the LA engine, drill/tap.

The '63 727 input shaft spline is different than the '67 and later, must use '62-'66 converter or change input shaft.
Posted By: MoPar

Re: 1970 318 mating to 1963 727 - 12/18/17 12:31 AM

Thanks everyone for the input, I like the last answer the best as that would mean I don't have the pull the LA 318 I just put in yesterday !
Posted By: A727Tflite

Re: 1970 318 mating to 1963 727 - 12/18/17 01:03 AM

OP reused the original converter.
Posted By: TJP

Re: 1970 318 mating to 1963 727 - 12/18/17 02:21 AM

Originally Posted By John_Kunkel
All 727 converter pilot hubs are the same 1.81" diameter. The Poly motor trans case has one hole that won't match the LA engine, drill/tap.

The '63 727 input shaft spline is different than the '67 and later, must use '62-'66 converter or change input shaft.


Thanks John for stopping the internet tales whistling
bow bow
Posted By: Supercuda

Re: 1970 318 mating to 1963 727 - 12/18/17 02:47 AM

Originally Posted By TJP
Originally Posted By John_Kunkel
All 727 converter pilot hubs are the same 1.81" diameter. The Poly motor trans case has one hole that won't match the LA engine, drill/tap.

The '63 727 input shaft spline is different than the '67 and later, must use '62-'66 converter or change input shaft.


Thanks John for stopping the internet tales whistling
bow bow


Not a tale, a simple mistake, the pilot diameter issue applies to the 904 style transmissions, only.
Posted By: MoPar

Re: 1970 318 mating to 1963 727 - 12/18/17 12:09 PM

Thanks again everyone for all of the experience and knowledge !!
Posted By: dogdays

Re: 1970 318 mating to 1963 727 - 12/18/17 09:11 PM

I didn't read the intermediate posts between OP and here, so beware!

The bellhousing has one hole that doesn't line up, the lowest one on the driver's side. Many leave the bolt out. Because this bolt is the lowest , below the centerline of transmission and crank, it is important to have some clamping force at that point. I found that I was able to drill a new hole and tap it but I could have also used a bolt and nut. It doesn't have to be a huge bolt. It could be one size smaller than the others and still do its job.

R.
Posted By: John_Kunkel

Re: 1970 318 mating to 1963 727 - 12/18/17 09:50 PM

Originally Posted By Supercuda
Originally Posted By TJP
Originally Posted By John_Kunkel
All 727 converter pilot hubs are the same 1.81" diameter. The Poly motor trans case has one hole that won't match the LA engine, drill/tap.

The '63 727 input shaft spline is different than the '67 and later, must use '62-'66 converter or change input shaft.


Thanks John for stopping the internet tales whistling
bow bow


Not a tale, a simple mistake, the pilot diameter issue applies to the 904 style transmissions, only.


Gosh, maybe that's what I was trying to convey. rolleyes
Posted By: dogdays

Re: 1970 318 mating to 1963 727 - 12/18/17 09:54 PM

Thank you, John Kunkel, for being a touchstone, a rock upon whose knowledge we can base our decisions.
Merry Christmas and a Happy and Healthy New Year!

R.
Posted By: Supercuda

Re: 1970 318 mating to 1963 727 - 12/18/17 09:57 PM

Originally Posted By John_Kunkel
Originally Posted By Supercuda
Originally Posted By TJP
Originally Posted By John_Kunkel
All 727 converter pilot hubs are the same 1.81" diameter. The Poly motor trans case has one hole that won't match the LA engine, drill/tap.

The '63 727 input shaft spline is different than the '67 and later, must use '62-'66 converter or change input shaft.


Thanks John for stopping the internet tales whistling
bow bow


Not a tale, a simple mistake, the pilot diameter issue applies to the 904 style transmissions, only.


Gosh, maybe that's what I was trying to convey. rolleyes


I was not talking to you. If your comprehension equaled your arrogance you'd be the genius you think you are.
Posted By: RapidRobert

Re: 1970 318 mating to 1963 727 - 12/18/17 10:33 PM

When I posted I (erroneously) had thought the 727's had a similar register/nub dimention change in the mid 60's that the 904's did. My bad.
Posted By: John_Kunkel

Re: 1970 318 mating to 1963 727 - 12/18/17 10:35 PM

Originally Posted By Supercuda

I was not talking to you. If your comprehension equaled your arrogance you'd be the genius you think you are.


Pot........meet kettle.
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