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Old 07-13-2012, 07:42 PM   #1
Phil Teller
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Default TH-700R torque converter to 472 flex plate bolt pattern

I have bolted a TH700R to my fresh built to OEM specification 472. I used an adapter plate to make the connection but now find that the torque converter in the brand new 1988 TH700 has a bolt diameter that doesn't match my Cadillac flex plate. Do I switch to a TH-400 converter? Will it fit the front shaft of the TH-700? Is there a Th-700 torque converter that will match the bolt pattern on the Cad flex plate? Is there a flex plate that will match the TH-700R torque converter? Anyone? Anyone? Thank you!
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Old 07-14-2012, 03:25 PM   #2
Schurkey
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1. TH 400 converter will not work with a TH 700 transmission.

2. I'd be amazed if the 700 will stand up to the torque of the 472. Better be easy on the throttle.

3. How are you supporting the front of the converter once you've added in the engine-to-transmission adapter plate? How thick is the plate? Have you verified that the converter snout is the correct diameter to fit the crankshaft recess?

Sorry, I can't help on the bolt circle difference. Perhaps you could have the flywheel drilled to the new bolt circle, and use washers or machined spacers to put the torque converter at the correct relative height. Don't forget that the 700 converter will almost certainly have metric threads for the converter-to-flywheel (flexplate) bolts.
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Old 07-15-2012, 09:00 PM   #3
superbinder
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I think an aftermarket sfi flex plate has extra converter holes
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Old 11-20-2012, 09:36 PM   #4
DaveM
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the smaller bolt circle falls right on a bend of the flex plate.. Some guys have used washers with a flat ground on it so to make it flat to sit on.. What I have done is put weld metal on the spots where the holes are and mill them flat and drill the holes.. I used that for a few years then switched to a sfi flex plate..
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Old 02-22-2014, 11:05 PM   #5
Miklo II
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Quote:
Originally Posted by Phil Teller View Post
I have bolted a TH700R to my fresh built to OEM specification 472. I used an adapter plate to make the connection but now find that the torque converter in the brand new 1988 TH700 has a bolt diameter that doesn't match my Cadillac flex plate. Do I switch to a TH-400 converter? Will it fit the front shaft of the TH-700? Is there a Th-700 torque converter that will match the bolt pattern on the Cad flex plate? Is there a flex plate that will match the TH-700R torque converter? Anyone? Anyone? Thank you!
theres is a torque converter that will mathc the flexplate. this has been done before. same with 2004r transmission. make sure the 700 is beefed up internally so you mash the gas.
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