73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Topic started by: koolray09 on November 14, 2015, 09:39:57 am
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I have a turbo 350 with np230 and requisite adapter plate. Four bolts hold the adapter plate to the transmission.
these bolts are special in that they have - what looks like - a small shoulder where the threads meet the underside of the bolt head.
there is a matching circular indention in the adapter plate to match.
Where do I go to buy those bolts new ?
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Might try a dealership, I used ordinary grade 8 bolts on my 350/203 combo.
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Dealership was my first call. No luck.
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Any hardware store will have bolts to fit your threads, & length. Grade 8 will be the best bet. Clean the holes out with some brake clean, maybe compressed air if you have a compressor. Use blue lock tight on the new bolts.
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Fastenal carries all types of bolts and such.
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As it turns out...what I thought was a machined surface that looked like an o-ring, turned out to be an actual o-ring. It is a sealing washer. AS you know, the adapter plate has a gasket where it bolts to the NP203 xfer case. Those bolts, if not sealed will allow fluid from the xfer case to leak. Turns out, nothing special. just a bolt with a sealing o-ring - that can be replaced. I will install new orings and sealant when I mount that adapter plate to xmission.
I found this exloded view on another forum I was browsing... pay attention to item 7.