92hatchLX

You can use them on your '89. I wouldn't spend my money on gear drives. Summit has a nice, adjustable, double roller timing chain and gear setadjustable set for like 38 bucks, that's what I'm using in mine.

Diggityd

Check out my topic. I have a video in this topic of my gear drive in action.

https://mustangforums.com/m_2374558/mpage_2/tm.htm

Leeiswho2b

Had a Pete Jackson gear drive on my 88 t-top. Had no probs whatsoever at all. Everyone and there brothers would stop me to ask what kinda of s/c I had. Wasn't a screeching sound. That sounds like a install issue.

ModularFox

yeah i run gear drives in all my other cars (chevy small block and big block motors) the only thing that stopped me with my mustang is the machine work some require and i hear they dont work with the newer efi motors.

musclemustang94

Gawd F that crap. I say get a double roller man that crap is annoying. Why would you want that? Its obnoxious and doesn't even do anything for you.

nmerrill

Kinda sounds like a empty PS pump to me. Ill stick to a double roller