h67st Posted July 1, 2018 Share Posted July 1, 2018 The 673 I'm using for my 1960 H67 is out of a 1958 H67; the transmission has some issues so I was hoping to use the trans out of my 1959. As you can see in the photos, the '58 has an adapter ring on the bellhousing (the flywheel housing on the '58 engine is shallower). Does anybody know if I can just swap the adapter onto the '59 transmission? They're both duplex transmissions. Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/ Share on other sites More sharing options...
41chevy Posted July 1, 2018 Share Posted July 1, 2018 I would put a straight edge across the one with the adapter and measure how far the input shaft sticks out, Swap the adapter to your other trans and see if the dimension is the same. Is the input shaft a bigger diameter then the one you took out of the your truck? The part of the input shaft that goes in to the pilot bearing different also? Paul 1 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401670 Share on other sites More sharing options...
Maddog13407 Posted July 2, 2018 Share Posted July 2, 2018 kinda hard to tell by the pictures but it looks like one is a 67 and one is a 72 series? i maybe be wrong 2 Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401721 Share on other sites More sharing options...
theakerstwo Posted July 2, 2018 Share Posted July 2, 2018 I think your right. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401723 Share on other sites More sharing options...
h67st Posted July 2, 2018 Author Share Posted July 2, 2018 21 hours ago, 41chevy said: I would put a straight edge across the one with the adapter and measure how far the input shaft sticks out, Swap the adapter to your other trans and see if the dimension is the same. Is the input shaft a bigger diameter then the one you took out of the your truck? The part of the input shaft that goes in to the pilot bearing different also? Paul The measurements look good; the one with the adapter has a 1-1/2" input shaft and the other has a 2". I think I can just swap the disc because the flywheels, pressure plates, and the pilot bearing are the same. 53 minutes ago, Maddog13407 said: kinda hard to tell by the pictures but it looks like one is a 67 and one is a 72 series? i maybe be wrong The transmissions are completely different; the one has 2 internal shift forks but the other has an external rod to shift hi-lo. The housings are completely different, but it looks like all the attachment points are the same. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401724 Share on other sites More sharing options...
Maddog13407 Posted July 3, 2018 Share Posted July 3, 2018 67 series was a cheaper box. id go with the bigger box. and they mounts may look the same but they are different between the two Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401790 Share on other sites More sharing options...
h67st Posted July 3, 2018 Author Share Posted July 3, 2018 9 hours ago, Maddog13407 said: 67 series was a cheaper box. id go with the bigger box. and they mounts may look the same but they are different between the two How can I tell which one is the 67 series? The mount brackets are different (the '58 hangs about 2" lower in the chassis, do you know why?), but the bosses on the transmission look the same. Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401795 Share on other sites More sharing options...
Maddog13407 Posted July 4, 2018 Share Posted July 4, 2018 67 the bell is mated to the trans all in one piece. the 72 has a removeable bell and some 72 series had as smaller bell but they are scarce. not sure what you actually have without more pictures. Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401861 Share on other sites More sharing options...
terry Posted July 4, 2018 Share Posted July 4, 2018 8 hours ago, Maddog13407 said: 67 the bell is mated to the trans all in one piece. the 72 has a removeable bell and some 72 series had as smaller bell but they are scarce. not sure what you actually have without more pictures. Seems like years ago I took a 72 series transmission out of a B53 that had a smaller bell on the trans. terry Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401875 Share on other sites More sharing options...
Maddog13407 Posted July 4, 2018 Share Posted July 4, 2018 i scrapped a B62 that someone swapped in a 673 and used the original 10 speed 72 series. they actually torched the trans mounts, moved them back and rewelded them . this had the smaller bell on the 72 series. never understood that cause you could get the 67 or 72 behind a 464 gas job. the mounts look the same but even the front motor frame mount is different between say a B62 or B68 and a B61 so i assume its the same for an H series Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401902 Share on other sites More sharing options...
h67st Posted July 5, 2018 Author Share Posted July 5, 2018 Well, I got to looking at it today and you can't put the adapter on the other trans...the bolt circle is smaller. I tried to swap the flywheel housing off the '59 but when I put a dial indicator on it, it's .032" off center. Does anyone know if you can have a machine shop move the dowel pin holes? It sounds like a complicated fix. Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401942 Share on other sites More sharing options...
terry Posted July 5, 2018 Share Posted July 5, 2018 1 hour ago, h67st said: Well, I got to looking at it today and you can't put the adapter on the other trans...the bolt circle is smaller. I tried to swap the flywheel housing off the '59 but when I put a dial indicator on it, it's .032" off center. Does anyone know if you can have a machine shop move the dowel pin holes? It sounds like a complicated fix. The proper way to center flywheel housing, is remove dowel pins, center housing and ream dowel holes, and drive oversize pins in. terry 2 Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401953 Share on other sites More sharing options...
h67st Posted July 5, 2018 Author Share Posted July 5, 2018 8 hours ago, terry said: The proper way to center flywheel housing, is remove dowel pins, center housing and ream dowel holes, and drive oversize pins in. terry Is that something you have to use a milling machine for? Sounds like a process I can't do in my shop, especially with the engine assembled. Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401960 Share on other sites More sharing options...
terry Posted July 5, 2018 Share Posted July 5, 2018 5 hours ago, h67st said: Is that something you have to use a milling machine for? Sounds like a process I can't do in my shop, especially with the engine assembled. no milling unless flywheel housing was run real loose for a long time, can do it with engine in the frame, maybe there is something you are not understanding? like I said remove flywheel housing, remove dowel pins, install flywheel housing and dial indicate to find center, and tighten bolts, ream dowel pin holes to a size you can get oversized dowel pin for and pound them in. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-401987 Share on other sites More sharing options...
h67st Posted July 6, 2018 Author Share Posted July 6, 2018 18 hours ago, terry said: no milling unless flywheel housing was run real loose for a long time, can do it with engine in the frame, maybe there is something you are not understanding? like I said remove flywheel housing, remove dowel pins, install flywheel housing and dial indicate to find center, and tighten bolts, ream dowel pin holes to a size you can get oversized dowel pin for and pound them in. terry Thank you! I will give this a shot. Quote Link to comment https://www.bigmacktrucks.com/topic/53705-swap-transmissions/#findComment-402045 Share on other sites More sharing options...
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