Torque converter bolt help?

Black Z · Dec 13, 2009

Just install my B&M holeshot 2400 stall converter on a TH350 tranny. Here is the problem I had. The converter came with 3/8-16 by 1/2" length mounting bolts. When installing them through the flexplate into the converter they only catch about 2 threads and I could feel them staring to strip as I was torquing them to 30 ft. lbs. It really needed a 3/8-16 x 5/8" mounting bolt to fit properly but I could not find any 5/8" length bolts at ACE except in stainless steel. the next size was 3/4" length and they bottom out before being able to tighten them properly. What I did was use a 3/8-16 x 3/4" grade 8 bolt with 2 grade 8 washers. This was they did not bottom out and they do not seem to stick out to far to have clearance issues. I use loctite also. Do you think this will be a problem or should it work OK? Thanks

BEECHFRONT · Dec 13, 2009

1/2 bolt sounds kinda small, are you sure you have the flexplate on correct?

BEECHFRONT · Dec 13, 2009

The raised part of the indentation on flexplate goes towards the converter, 1/2 should contact more then a thread or 2, maybe you have it on backwards and thats why the supplied bolts are not long enough?

Black Z · Dec 13, 2009

I have it on correct, indentation toward the converter. The threads on the converter do not start until about 1/8" in not leaving much to make contact with.

BillyGman · Dec 13, 2009

I don't see the washers being used as spacers being any problem. But for future reference.....

http://www.boltdepot.com/

Black Z · Dec 13, 2009

Thanks for the link. Hopefully it is OK since I did use loctite also.

Black Z · Dec 13, 2009

Would it have been better to use the bolt, washer and a lock washer instead of just using the bolt and 2 flat washers?

BillyGman · Dec 13, 2009

If you used a torque wrench on the bolts, and applied the proper torque, it shouldn't be a problem. You went the extra mile and used the loctite also, so I wouldn't worry about it if I were you. As long as all or most of the threads of the holes in the torque converter are engaged by the bolts, you should be good.

Torque converter bolt help?

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