For you guys with lots of auto trans wisdom: I'm having to buy pieces to get the trans and engine married up. I didn't get a flex plate with the engine when I bought it so I bought one at O'reilly's. 168 tooth if IRC. It does work with the starter. I was going to stick the trans on the block today but checked a couple of things first and found the bolt pattern for the conv. to be smaller that the flex plate. The conv. pattern is 9 1/4 and the flex plate is right at 10". Also the bolt holes in the flex for the conv. are 1/2" holes and the holes in the conv. are 3/8" (7/16 won't go in the hole.) Can one of you steer me in the right direction. I have little knowledge in these. THANKS!!! Tim
How about a little more info on the converter? and the part number of the flex plate? Sounds like a little converter, and a normal size flex plate...but does the flex plate have two different bolt patterns on it? some do, some don't
Jim: Thanks for responding. You are always a big help and give great, accurate advice. Her's some more info. The convertor came with the trans from the shop that built it. That's all I really know. The plate is a Pioneer product # FRA 113, pics included. Six holes in the plate but one pattern The tag on the conv. says th350hs with a date. Thanks.
Never seen a converter without threaded holes in it. With the setup you have if the pattern was correct you would need bolts and nuts to bolt it together.
Hi you need a flex plate with two hole patterns. Also I have had to drill the holes in the flex plate to the size of the holes in converter and use the right size capscrews and lock nuts. Regards Dave
You got the flex plate for a TH400 with the 6 lug converter, not for a TH350. Try again...maybe the FRA-100 would do what you want.
Glad to help! Also, make sure you get the correct bolts and nuts for the torque converter. There are a few different flavors...you need 5/8" long, 3/8" diameter and it would be nice if the bolts had a washer head. https://www.oreillyauto.com/shop/ha...434/1975/chevrolet/bel-air?q=torque converter might be what you need. As seen here: https://www.summitracing.com/parts/pio-859035
Unless it just the paint on that converter......that front side looks funny to me. Almost like someone fixed a ballooning problem?
It does look like a rather rough stamping. Otherwise , just a 350 converter. As Jim said , the flex is a HD , truck , or RV 6 lug T 400 unit (350 engine, no balance weight)
Jim: I took the flex plate back and switched it for the fra100 and it is correct. I also took the convertor and trans back ot the trans shop that built it. I couldn't get it to "seat" in the tranny and they had to figth it. Actually, the shop owner saw the "waffling" look on the front of it and wanted to swap it out also. So, now I have correct flex plate, new convertor and a new set of convertor bolts with the trans married up to the engine and mounted back in the fresh chassis. Down hill from here..(some body's famous last words). Thanks all for the help and info. Tim
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