Tran..
- Thread starter Natefew
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Jarhead79
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I would assume you may have to change torque converters or maybe there is an adapter? Haven't messed with this stuff and still learning. I know with an Ls motor I can use my 350th with it by using an adapter and modifying the bolt holes in the flex plate. Might be the same thing for the 454?
PrairieDrifter
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What year is the 454 out of? What transmission do you have?
bigcountryguy19
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Make shure you have a dual bolt pattern flex plate.
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rollinon35s
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If 3 of them line up bolt it up and forget about the other 3. That's what I was told by tech support at Jeggs when I called in with this question. But mine was a old 350 going to a newer 4L80 so I'm not sure if your issue is the same or if your bolt pattern is truly different.
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Most apps only had 3 bolts anyway. Some of the heavier duty applications used 6 bolts.
I always thought there was only two mounting patters- a large and a small. But more recently I tried to use a flexplate from a vortec 350 on a tbi 350 with a th350 and high stall aftermarket convertor, the patterns didn't match. Had to use the flexplate from the tbi motor. So apparently some newer applications use a different bolt pattern than in the past.
