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tokaanu 01-31-2013 04:05 PM

motor locked after installing c4 trans
hi guys ive just installed a c4 trans to 351clevo tryed to start but no crank no start chacked connections looked ok ,took out plugs tryed to turn by hand woodnt budge, wandering ifin i can get some good advise as im no mechanic ,any help much aprciated cheers.

alkey 01-31-2013 04:18 PM

motor locked up
sounds as though front pump and torque converter are not aligned.unbolt torque converter from flex plate and see if you can move converter toward transmission,also try to rotate engine. could have damaged front pump if they werent aligned.

Crosley 01-31-2013 06:09 PM

Can not rotate converter on C4 application, although there should be movement as mentioned. Converter studs protrude thru the flexplate during install.

Is it possible the converter was bolted to the flexplate first , then the trans installed on to the engine? If so... broken pump is the result.

As it sit now, sounds like a broken pump may have happened

tokaanu 01-31-2013 07:39 PM

thanks guys should of joined hot rodders years ago when i put trans in ,i did it the wrong way fex plate to motor then tc to flex then bell trans to tc ,bugga just wandering i still have my old c4 trans is it possible to swap pumps? any suggestions will be much appreciated,cheers.:(

rick 427 02-01-2013 07:56 AM

I don't know what year trans you got....65-69 pumps will interchange.Then 70-77.Then 78-81,followed by 82-86.

tokaanu 02-01-2013 02:01 PM

hi there my stock trans c4 was 71 an c4 that i put in wrong is a 77or78 so i may be able to swap? ganna drop tans today.then see how to go about changing pumps.wandering if any specialist tools will be needed.cheers

mmerlinn 02-03-2013 01:41 AM


Originally Posted by rick 427 (Post 1641254)
I don't know what year trans you got....65-69 pumps will interchange.Then 70-77.Then 78-81,followed by 82-86.

65 and 66 pumps used an o-ring seal. All later versions used a gasket seal. Using the wrong type can result in leaks.

70 to 81 all directly interchange. Only difference is sealing ring width.


OP. No specialist tools needed. It is possible, though unlikely, that your pump is ok. Check it out before you replace it.

Also check the converter snout. Sometimes it can get damaged in situations like this. Check your bell for cracks, especially around your motor bolts.

If your input shaft does not slip out easily, you could have damaged your forward drum.

tokaanu 02-04-2013 01:30 AM

hi there iv dropped trans today, and il ispect all that youve mention, i have my other c4 which ive started to take apart just so ive got some idea how to remove pump safely ive removed bell,pan,vaules,bolts, but pump hard to get out, any sugestions. mate how can i tell if my pump on other trans is ok cheers.

tokaanu 02-04-2013 08:32 PM

hi there i checked bell 4 cracks ,none, input shaft comes out smoothly, checked converter snout and there is a slight kinck, i put cv to case and she landed sweet and spun freely i also put cv on donor pump and it landed sweet on that case too. gana take to machanic see if they can do swap, as im not to familier on how to do swap,got that dam pump off the donor at last. if theres any thing im missing let me know,cheers for help much aprciated.

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