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Old 04-27-2009, 07:41 PM
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Bellhousing and Transmission bolt size?

Ive got a standard 10.5 size gm bellhousing that will be mated to a 70's model 350 with a 78 model super T-10 4 speed. can any one tell me what size bolts i need to mount the bell housing to motor and tranny to bell. and length and standard or fine thread would be good. thanks.

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Old 04-27-2009, 08:18 PM
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If i remember correct its a 3/8 standard thread for bellhousing to the block.cant remember if its the same for the trans to the bellhousing or not. to get your legnth take a piece of wire place it in the hole mark it and get a bolt just alittle longer.and dont forget the width of the bellhousing when doing this. local parts store might be able to help also with the other bolts. hope this helps. Cole
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Old 04-27-2009, 08:57 PM
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3/8 x 16" for the 6 bellhousing bolts, around 1.5 or 1.75" long youll have to measure or i can find one around here and measure length.

tranny depends on model and year the bellhousing is for or form, and sometimes tranny if threads are in any of the holes on it.

GM randomly changed holes in trannies and bellhousings, some threaded, some not, never know which or how many are or or are not
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Old 04-27-2009, 09:13 PM
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Quote:
Originally Posted by fast68
3/8 x 16"
what does the 16" mean?
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Old 04-28-2009, 10:05 AM
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Its the pitch, in threads per inch. 3/8-16 is a 3/8" bolt with coarse threads (the common kind).
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Old 04-28-2009, 09:29 PM
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Don't be ashamed to bring the bellhousing into the hardware store with you. That's what I did.
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Old 04-30-2009, 04:17 PM
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Quote:
Originally Posted by HawkMonster
Don't be ashamed to bring the bellhousing into the hardware store with you. That's what I did.
great idea,thanks!!
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