DS12211 Billet Steel 429 Flexplate (Multi-Pattern)May 24, 2022
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DS12213 Billet Steel 429 Flexplate (Multi-Pattern) with factory adapter.
Billet Steel Flexplate for automatic transmissions
This flex plate fits ’64-’65 Cadillac 429 engines that have a TH400 bolted up with a factory cast iron adapter, and the starter bolted to the transmission adapter. Please see detailed description for identification information before ordering.
Billet Steel Flex Plate Multi-pattern
This flex plate fits ’64-’65 Cadillac 429 engines that have a TH400 bolted up with a factory cast iron adapter, and the starter bolted to the transmission adapter.
‘This will not work with64-’67 Cadillac 429 engines with the TH400 or other modern transmission bolted directly to the block (or using an aftermarket transmission adapter), with the starter bolted directly to the block.
For these engines with a TH400 (or an aftermarket adapter to mount another modern transmission), use flexplate DS12211.
For these engines with the factory adapter, but the factory adapter removed, or those that originally had a Hydramatic transmission bolted directly to the block, you can adapt a modern Chevy pattern transmission using adapter DS31301, which comes with it’s own flexplate.
We do not offer a replacement flex plate for the Hydramatic transmission.
Transmission identification – the Hydramatic is a 4 speed transmission, with a shift pattern of PND21R. ‘Modern’ transmissions have a shift pattern of PRND21, PRNDL, PRND321, etc.).
Adapter identification: Aftermarket adapters are generally made of steel, machined not cast, and essentially flat on both sides. With the exception of the DS31301, they should be roughly 5/16″ thick. Factory adapters and the DS31301 are quite a bit thicker, and include a starter mounting provision. The factory adapter is cast iron, and is not solid – there are large hollow areas in it.
When hooking up a 429 Caddy to a Chevy or GMC converter, you have to keep in mind that the bolt pattern on the converter must match the hole pattern on the flexplate. TH-400, 4L80E, and Allison converters generally have the “large” diameter pattern (11.5″), but light duty trannies (‘Glides, TH-350, 700R4, and TH200) have a smaller pattern (10.75″). You cannot safely drill out the stock flexplate, because the smaller circle falls on the stress ridge on the Cad flexplate. Three holes in there, and your chances of blowing the middle out of the flex plate are pretty good.
All of our aftermarket and OE replacement flex plates and flywheels have a Cadillac 166 tooth ring gear for use with a stock Cadillac style starter. This flexplate is zero balanced like stock and compatible with most ’64 and some ’65 Cadillac 429 engines with the TH400 bolted up with a factory adapter and the starter bolted to the adapter.
|15 × 15 × 2 in
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