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Old 05-13-2017, 04:10 AM   #1
lswonmatt
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292 3 speed to th350

Looking to ditch the 3speed for a th350 but want to keep the 292 for now what would be required to make the combo work ? From what I been reading it seem to be a pretty straight forward swap with only swaping the flexplate.. anyone know what flex plate to use?
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Old 05-13-2017, 11:22 PM   #2
Captainfab
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Re: 292 3 speed to th350

You will need a flexplate specifically for a 292 I believe. You might look up an application for a early to mid '70's truck. You will also need an auto trans crossmember. One from a '63-'87 truck will work. Keep in mind that you will need to remove the bellhousing crossmember and also you will have to switch to a block mounted starter.
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Old 05-14-2017, 06:59 AM   #3
Tx Firefighter
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Re: 292 3 speed to th350

The main thing about a 292 flexplate is that the bolts holding it to the crankshaft are larger. They are 1/2" rather than the common 7/16". The easy route is to use a normal (non 400 CID) small block or 230/250 inline six flexplate and drill the holes one size larger. I use a step bit on a cordless drill to do it. If you don't want to go to that trouble, Rockauto has the correct 292 specific flexplates in stock.

You'll want to look at the bottom of your block at the starter holes before you choose a flexplate. If you block has three starter mount holes you can use either a 153 tooth or 168 tooth flexplate. If you block only has two starter holes you must use a 153 tooth flexplate only. You can simply swap the appropriate nosecone (straight across bolt holes for a 153 tooth, staggered bolt holes for a 168 tooth) onto your present starter to avoid the expense of buying a new starter.

Also, making a blanket statement like using a trans crossmember all the way up to 87 is a little simplistic. The crossmember out of most of the later 73-87 trucks was a goofy thing that wrapped around the outside of the driver's side frame rail. Basically, GM made the weird crossmember to give more room for the big catalytic converters on those trucks. You don't want that one. If you do choose to use a squarebody truck era crossmember, you want one that fit's inside the two frame rails from a model that wasn't equipped with a converter.
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