Below is a sketch documenting how I checked the over-drive relay after I lost the use of over-drive last winter. It follows a technique I’d seen posted on the Brick Board, probably by Dave Barton. It took a while to troubleshoot but I eventually sucked it up and got the $40 Over-drive Solenoid Bypass kit from IPD and it’s worked great since then.

UPDATE: Added photo of the bypass kit install at bottom of this post.

overdrive-relay

Here’s a picture of the install, looking up at the transmission. You can see that the bolts are on the reverse side, so you need a tiny 12mm ratcheting wrench to work it in such a small space. Click image to enlarge.

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