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73 302 ro 351w swap now transmission noise
#1
Swapped from 302 to 351w from late 70's (?78 i believe).  Am using the previous C4 transmission with a pioneer FRA-203 flex plate that I got new.  Had same teeth number and diameter as previous.  The windsor had clutch plate previosly.

Fit back together but hear scraping sound going into reverse and is at times difficult to get in to gear (won't shift though the gear shifter moves properly and freely. 

Under heavy acceleration it is a terrible sound, scraping or loose belt type sound (only did it once...)


I suspect after researching that I have the wrong flex plate.  Is this the likely reason?  Has driven maybe 2 miles, how much damage?  

I am removing transmission, have taken down inspection plate and the torque converter bolts were in place and are now removed.  Getting ready to pell trans but wanted to check for any other thoughts or advice.

previously had a 3speed top loader that i have in my possession but no linkage.  How hard would that swap be and would I be better off?



scott
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#2
Did you lock tite the flex plate and converter bolts ?

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#3
(01-12-2019, 05:10 PM)72MustangSprint Wrote: Did you lock tite the flex plate and converter bolts ?

yes.  the converter nuts were tight.  have not seen the flex plate ones yet but did apply loctite and torqued them
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#4
Thinking you might not have seated the torque converter all the way into the pump. There should be play between the converter and the flexplate, about 1/4" or so. The converter should be able to slide fore and aft that amount. If it's jammed up tight against the flexplate, you have a problem.


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#5
I had watched sev vids on seating the torque converter and felt i did it right but...   I do not fully understand the concept of the "1/4 play" between flex plate and convertor.  It seems you are tightening the the convertor directly to the flex plate.  i may must not fully comprehend the function of the convertor and its relation to the flex plate
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#6
(01-12-2019, 10:12 PM)samckay Wrote: I had watched sev vids on seating the torque converter and felt i did it right but...   I do not fully understand the concept of the "1/4 play" between flex plate and convertor.  It seems you are tightening the the convertor directly to the flex plate.  i may must not fully comprehend the function of the convertor and its relation to the flex plate

samckay,                                                                                                                                       With the torque converter fully seated in the transmission front pump and the transmission boits torqued, the studs from the torque converter should protrude from the flex plate just enough to get the nuts started.                                                                                                                               When you begin to tighten the first nut the torque converter should be able to move within the hole in the flex plate and should also be able to move foreward to seat against the flex plate.                  sorry but you may have damaged the transmission front pump.                                                      I would suggest that you remove the torque converter nuts till you have only one remaining and see with the last one loose that the torque converter stud moves freely inside it's hole both clockwise and counter clockwise , as well as front to rear.                                                                          if it does not, I think your front pump may be damaged.                                                            Boilermaster
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#7
Also check for contact between the flex plate and the block cover. At least in the Cleveland the block cover can interfere with the back of the oil pan so not seating flat against the block which causes the flex plate to scrape the block cover. However, i dont see how will this affect the shifting. It should just be noise.

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        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
4-wheel disc brakes
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#8
Boilermaster cleared up what I was getting at.


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#9
got transmission out and the spacer plate has scrapes consistent w torque convertor and the new flexplate is approx 3/16 inch THINNER than the original that was attached to this transmission.

Not sure if the issue is only the flexplate or how to go forward. tried to post some pics but not successful
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#10
Does the flexplate show circumferential scratches?

Edit: are you referring to the block plate by spacer?


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        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
4-wheel disc brakes
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