torque converter question

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Aug 29, 2007 | 01:29 PM

Burning Rubber

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From: edgewater, maryland

torque converter question

I am putting a TH400 behind my LT1. Can anyone tell me what bolt pattern the LT1 uses?? 10 3/4 or 11 1/2?? Will I have to change flex plates or can I make the stock Lt1 flex plate work??

Aug 29, 2007 | 05:38 PM

socal

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From: Lake Jackson TX, south of Houston

the smaller one 10 3/4", you would have to drill holes for the larger and i don't know about the balance just get the smaller pattern convertor

Aug 29, 2007 | 08:40 PM

chief455

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Quote:

Originally Posted by Burning Rubber

I am putting a TH400 behind my LT1. Can anyone tell me what bolt pattern the LT1 uses?? 10 3/4 or 11 1/2?? Will I have to change flex plates or can I make the stock Lt1 flex plate work??

I got a crash course in this but wound up with the large diameter, dual convertor bolt pattern SFI flexplate from a 383LT1 with a TH400

yours for 50 bucks shipped - problem solved

The LT1/4L60E plate is a small diameter 153 tooth with 10-3/4 convertor
To use the outer starter mount holes locating the nose into the bellhousing, and most TH400 convertors you need the large diameter 11-1/2 pattern with 168 teeth.

Oh - I also have the chromemoly driveshaft with a TH400 front yoke and 1350 u-joints for you