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Bolt Pattern for 3.1L T5 Bellhousing?

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Old Mar 30, 2026 | 07:08 PM
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calh223's Avatar
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Bolt Pattern for 3.1L T5 Bellhousing?

I cant seem to find the bolt pattern specs for a T5 Bellhousing to mount up to a 3.1L at all. Was wondering if there are any other matches that could work if anyone knows of or am i just gooing to have to be stuck with ripping one out of a donor car? Unfortunatley not many people are parting out 3.1 manual third gens near me.
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Old Mar 31, 2026 | 07:52 AM
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Re: Bolt Pattern for 3.1L T5 Bellhousing?

Which side? Engine, or transmission?
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Old Mar 31, 2026 | 09:00 AM
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Re: Bolt Pattern for 3.1L T5 Bellhousing?

Originally Posted by calh223
I cant seem to find the bolt pattern specs for a T5 Bellhousing to mount up to a 3.1L at all. Was wondering if there are any other matches that could work if anyone knows of or am i just gooing to have to be stuck with ripping one out of a donor car? Unfortunatley not many people are parting out 3.1 manual third gens near me.
The 3.1L will use the "GM Metric" pattern on the engine side, same as the good ol' Iron Duke (and every other motor in the 60degV6 family). On a thirdgen T5 bellhousing, the transmission side will use the Muncie 4 bolt pattern. As for other compatible bellhousings, if you want to keep the factory tilt on the T5 for shifter location, you'll unfortunately need to source a thirdgen V6 T5 bellhousing (the 2.8 ones will work as well). You CAN use something like a 2.8 S10 bellhousing, but it will not have the tilt that a thirdgen bell would have (also uses a slightly different slave cyl setup, but could be made to work if you keep shifter location/ trans mounting in mind.... also means you'd need to spend more time/ money on it vs a regular thirdgen bell). The 4thgen 3.4 bellhousing WILL bolt up to your motor, but WILL NOT bolt to your transmission; 4thgens started using the Ford pattern on the trans side of the bell instead of the Muncie 4 bolt
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