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What Size Are Chevy Transmission Bolts?

FAQs Jackson Bowman August 17, 2022

They are 1/2″ coarse thread, 1-1/2″ long should do it, you need Class 5 or better (3 radial lines on the head of the screw).

What size are the bellhousing bolts on 4L60E?

Bell housing screw, 45mm long, TP-50 head, 4L60E.

What size are LS bellhousing bolts?

What grade are transmission bolts?

The gear mount doesn’t have much to do except not collapse under the weight on it. Grade 5 screws would suffice.

What size are B Series transmission bolts?

(1) M8 x 1,25 x 16 mm.

What size bolts are in a 4L60E transmission?

There are 2 screws that are 40mm under the head. The 5 pins are for cable clamps.

What size are torque converter bolts on 4L60E?

M10-1.50 x 15mm, suitable for GM TH-350/700/400/200, 4L60, 4L60E, 4L80E, 3L80 B78.

Is an LS Bellhousing the same as SBC?

The screw pattern of the LS1 chassis carrier is the same as the other SBCs. Yes, it is missing a bolt hole, but that bolt hole and/or threaded hole in the block is also missing on many other SBC engines and bellhousings. This bolt hole is normally only used for the castings for the truck, & other HD, applications.

What grade are bell housing bolts?

Current belfry screws are Class 5.

What size are LS starter bolts?

References:

  1. https://www.gmtransmissionparts.com/bell-housing-bolt-tp-50-head-4l60e/
  2. https://performancewholesale.com.au/products/arp-bellhousing-bolt-kit-gm-ls1-ls2-ls3-engine
  3. https://www.corvetteforum.com/forums/c1-and-c2-corvettes/4341271-what-grade-bolts-for-transmission-mounts.html
  4. https://eddieabbondanz.io/post/honda/b-series-bolts/
  5. https://www.trifive.com/threads/4l60e-bellhousing-to-block-bolt-size.35775/
  6. https://www.amazon.com/Torque-Converter-Heavy-Duty-M10-1-50x15mm-TH-350/dp/B07HKR3ZPG
  7. https://www.fiero.nl/forum/Archives/Archive-000001/HTML/20030204-2-014916.html
  8. https://www.gt40s.com/threads/stainless-bellhousing-bolts-vs-grade-5-bolts.12510/
  9. https://www.holley.com/products/fasteners_and_hardware/engine_fasteners_and_hardware/starter_bolts/parts/60940MRG

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