th400 question
02-02-2010, 09:12 PM
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th400 question ok guys gonna see if yall can lead me in the right direction...im building a 84 model chevy dually...when i got the truck it had a 454 and freshly rebuilt 400 in it...i put a 5.3 ls motor out of on of my 03 model project truck...keep the 400 to pull the heavy truck around and it was already rebuilt...puttin the carb intake on it...problem is my torque convertor bolts dont line up with any holes on my flywheel...what flywheel do i need....do i need the flywheel spacer also? thanks in advance
02-02-2010, 10:17 PM
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I used the stock 6.0 flexplate (flat one not the dished one) with the spacer on mine. Just put the converter in the hub of the crank and spin the converter around until you find a place with plenty of material to drill new holes and install it like that. It works great for me. Or you could go with the TCI set up like David suggests.
02-02-2010, 10:26 PM
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I used a part number 399753 tci flecplate for my th400 to ls1 swap and had a custom made fuddle trq converter so no spacer was needed. But i believe like said up top tci has teh spacer for like 15$ also
02-03-2010, 05:44 AM
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ok thanks for the replys...i already bought the spacer from gm but it didnt look like my starter would work so i took it back off(and ive still got the 5.3 flexplate)....ill track down a 6.0 flywheel...just sucks i gotta pull the trans out of a bodydropped truck
02-04-2010, 11:22 PM
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ok guys still need some help....i bought a 6.0/4l80 flexplate today(65 bucks from GM) and the GM spacer kit(75 bucks)...bolted the spacer and 6.0 flywheel up and the gap between the flexplate and convertor was a good 1/4 inch....if not more...so i bolted the 5.3 FP up with the spacer and it stuck out to far...when we bolted the trans back up there was still about 1/8 inch gap between the block and trans when the convertor and FP started pushing against each other(flexplate was starting to bend in toward motor)...so i removed the spacer and put the 5.3 FP without the spacer and the convertor and FP are 1/8(thickness of a washer) from touching...was thinkin of gettin a little bit longer bolt and running a washer between the FP and convertor...anybody ever done this....ive tried every combination i can come up with and none have worked out right...what would you guys do cause im gettin tired of pullin this trans out...thanks again for any replies
