Toploader Rebuild and Reassembly | 1969 Mustang 4-Speed

Spring is here and the salt is washing off the roads, which means it’s time to get the 1969 Mustang back in action! In today’s video, we are finally putting the Top Loader 4-speed transmission back together after discovering a damaged 3-4 synchro. I’m using a full rebuild kit from David Key Toploader, including new bearings, gaskets, and brass blocking rings. I also show a DIY trick using a 3D printed shaft I designed to keep those pesky needle bearings in place during assembly. We cover everything from cleaning off anti-corrosion wax to heating the rear bearing for a smooth install. David Key Toploader Rebuild Kit: https://4speedtoploaders.com/store/re... Amazon Hot Plate (Cheap & Effective!): https://amzn.to/47CJ8bi Assembly Lube (Extra Tacky): Driven Racing Oil Assembly Grease 00732 Permatex Thread Sealant & Anaerobic Gasket Maker: https://amzn.to/41actGs [Timestamps] 00:00 Intro: Getting the Mustang ready for Spring 01:10 Inspecting the damaged 3-4 Synchro 02:30 The Rebuild Kit: What's inside? 03:45 Pro Tip: Cleaning the cluster gear & needle bearings 05:15 Using the 3D printed "dummy shaft" 07:00 Cleaning the anti-corrosion wax off new synchros 09:15 Oops! Fixing a backwards 3-4 synchro assembly 11:30 Understanding the interlocks and detents 13:45 Installing the gear set into the case 15:50 The "Cheap" Bearing Heater trick 18:20 Installing the input shaft and cluster gear 20:45 Final assembly: Speedo gear & tail housing 22:30 Bench testing the gears (1st through Reverse) 24:15 Wrap up & First Drive teaser If you enjoyed this, hit that Subscribe button! We do DIY car repairs, 3D printing for restoration, and keep classic steel on the road. For sponsorship inquiries contact us here - [email protected] Check Out My Web Store to Support the Channel: www.smackeysgarage.com Join this channel to get access to perks:    / @smackeysgarage   As an Amazon Associate I earn from qualifying purchases Instagram:   / smackeysgarage   Disclaimer: This video is for entertainment and educational purposes only. Smackey's Garage is not responsible for any personal injury or property damage that may occur while working on your vehicle. The information and parts presented here are not a substitute for professional advice from a mechanic who has inspected your specific vehicle. Every DIY project carries risk; by watching and using this information, you agree that Smackey's Garage and its sponsors are not liable for any damages or losses. Work smart, stay safe, and wrench at your own risk!