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Old 06-15-2008, 02:45 PM
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Torque Conv shimming question

I just got done installing my torque converter and the shims that I have are 7/16" center holes (that's all that Jeg's offered... or 1/2"). The bolts are 3/8". Is this going to be a problem? Isn't all GM 3/8"? You'd think a 3/8" shim would be standard. If it was just one shim, I wouldn't be so concerned, but since I am shimming .250" for a mid plate and the converter needed another .125" to put the converter at 1.125" or so (Hard to get a good measurement installed) from the trans housing edge, it's got me a little worried. I did use new grade 8 bolts, but dang, that's a lot of shim. I've never had a mid plate, so I am concerned that I am doing something wrong.... the tq conv is a B&M 10" used, and the "nose" doesn't stick in the flywheel like it did in the car it came out of. I just don't want to fry anything in the tranny or shear off bolts (or worse). Thanks.

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Old 06-15-2008, 02:53 PM
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That is a lot of shimming so I understand your concern. All older GM trannys are 3/8" I think but some later ones use 10mm bolts, I believe. I'm pretty sure that's what my 4L60E uses for converter bolts.
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Old 06-15-2008, 04:20 PM
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converter shimming

The amount of shim isn't that bad, but the fact that the nose of the converter doesn't fit up into the pilot area of the crank is a BIG problem. Converters made for use with a mid plate have a longer nose on them for this reason. Some even have a screw-on nose so that they can be altered if needed. You need to send the converter out and have this issue fixed. Probably not what you wanted to hear.
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Old 06-15-2008, 08:18 PM
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Better to hear it now.... thanks, I'm going to pull it out. Wow, I never knew that the mid plate involved more than just shimming the converter. At least this is getting caught before it's running!
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Old 06-15-2008, 08:50 PM
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as mentioned... the converter MUST be built for the size of mid plate if one is used... very important

1/8 and 1/4 inch are very common mid-plate sizes
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