7MGTE Transmission Mount Bolts Strip at Spec Torque - Replace with Grade 8 Hardware

Transmissionbeginner✓ Community Verified

Problem

Brand new OEM Toyota transmission mount bolts strip when torqued to the factory-specified 18 ft-lbs during engine/transmission installation

Transmission mount bolts strip during installation at spec torque (18 ft-lbs)Bolt threads deform and bolt will not hold torqueIssue occurs with new OEM bolts from ToyotaSimilar stripping reported with new bellhousing bolts from Toyota

Root Cause

The OEM Toyota transmission mount bolts are a lower grade than needed and cannot reliably hold the specified 18 ft-lbs torque without stripping. The bolts themselves strip (not the mount threads).

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted August 2021 on SupraForums.com