🚦 ACDelco 3987921 GM Original Equipment Automatic Transmission Speedometer Driven Gear - Reliable Replacement for GM Vehicles Review

I gave 5 stars because this is a quality item and to get two at this price was a great deal. I ended up not using either one as it was the wrong part. I came back through no fault of my own and will keep them to give away or use in the future when I change gear. I went to the gear shop and got the number of teeth and gear color I needed, there are countless combinations. Anyway, everything worked fine once I got the right transfer.

The part supplied was fine and worked well but this part fits in the gearbox and only uses one and I had to buy two "packs of two". I will probably never use any other gear again and this isn't an item that many people can use. After this purchase I found the exact same product at Rock Auto where I could only buy one and cheaper for parts and shipping. After that, I'll most likely go to Rock Auto before Revain. Don't know if that helps, but thanks for asking. Roger.

Pros: The part worked great. Trans TH350, 26.5" Wheel, 3.73 Speed Tip: More teeth mean lower readings, fewer teeth mean faster speeds. My speedometer reads 10 more at 60 mph. 17% fewer 18-tooth gears. Number of teeth increased to 21, perfect : Why would this seller require a signature for delivery?! This is the $6 part. I appreciate fast shipping but it's pointless if they try to deliver it when I'm at work. Well the part worked, the truck is right. So don't get mad. Edit: Upgraded to 5 stars…