Flexplate bolt pattern

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Mar 4, 2003 | 04:51 PM

1badblue87z

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From: Charleston,West Virginia, USA

Flexplate bolt pattern

I am about to put a TH400 in my 87 Z28 but I have a ? about what the bolt pattern on a th350 and th400 flexplate. I have both flexplates and I'm needing to know the bolt patterns so I can get a new stall converter. Thanks for the help

Mar 4, 2003 | 05:22 PM

RB83L69

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From: Loveland, OH, US

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You need to use the one with the bolt pattern that fits whatever converter you get. Right now I can't tell which one that is.

Mar 4, 2003 | 05:24 PM

1badblue87z

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From: Charleston,West Virginia, USA

the converter has a 10.75 bolt pattern

Mar 4, 2003 | 06:53 PM

RB83L69

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From: Loveland, OH, US

Car: 4

Engine: 6

Transmission: 5

Make yourself a circular piece of cardboard or something with a piece of string, and measure your flex plates.

That sounds like the 350 pattern though.

Mar 4, 2003 | 09:09 PM

AlkyIROC

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From: 51°N 114°W, 3500'

Car: 87 IROC L98

Engine: 588 Alcohol BBC

Transmission: Powerglide

Axle/Gears: Ford 9"/31 spline spool/4.86

You can use a TH350 converter in a TH400. Order the converter to fit whatever flexplate you have.

Another option is to buy an aftermarket flexplate with dual bolt patterns.