I've got a 97 F-250 LD with the 4.6 and 5-speed. Lately when I start out in first gear there is a clunk somewhere in the drivetrain. I can't tell where it is coming from. It feels like the rear axle moves, but when it pops I can see the shifter and transfer case shifter move, so I'm thinking it near the transmission. Sometimes it pops so bad that the tires chirp. I want to think it's the slip yoke, but this just seems so severe. Any ideas what could cause this?

Thanks

 

Since the shifter and tranny are moving so much, I would suspect bad motor mounts or transmission mount. That doesn't explain the tire chirping though.

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1999 XLT S/C, 4.2 V-6, auto, 3.55 rear, dark torreador red/harvest gold, bed liner, Sony 10 disc CD, Edelbrock IAS, K&N filter, soon to Superchip