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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 02-02-2010   #1 (permalink)
lxixboss is offline Rookie

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Default Mix 'n match ring and pinion gears in 9-inch?

I have two Ford nine-inch pumpkins. One has a 30-tooth ring gear and a 10 tooth pinion gear for a 3.00:1 ratio. This one has an open (non-posi) differential.
The other has a 35-tooth ring gear and a 9-tooth pinion gear for a 3.89:1 ratio. This one has a posi differential.
Can I exchange the pinion gears in these two rear ends? If I put the 10 tooth pinion gear with the 35 tooth ring gear, that would give me a 3.50:1 ratio and if I put the 9 tooth pinion gear with the 30 tooth ring gear, that would give me a 3.33:1 gear ratio.
Both use 28 spline axles.
Any help would be appreciated.

Richard in Ottawa (Canada)
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Unread 02-02-2010   #2 (permalink)
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Hi! this is a big NO NO, never misc match gears, first gears set are machined with the same cutter for proper gear meshing, second different size cutter are used for deferent gear teeth number. They have ranges like one cutter size cut gear between 26 to 34 teeth and the next size cut 35-54 teeth. Finally the diameter of the pinion and thickness of the ring gear changes on different gear rear ratio that might cause a problem too.

Last edited by zr2_wolverine; 02-02-2010 at 07:28 AM. Reason: spelling
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Unread 02-02-2010   #3 (permalink)
stang93mustang is offline MACH I Member


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Quote:
Originally Posted by zr2_wolverine View Post
Hi! this is a big NO NO, never misc match gears, first gears set are machined in sets with the same cutter for proper gear meshing, second different size cutter are used for deferent gear teeth number. They have ranges like one cutter size cut gear between 26 to 34 teeth and the next size cut 35-54 teeth. Finally the diameter of the pinion and thickness of the ring gear changes on different gear rear ratio that might cause a problem too.
++++++++1, I was getting ready to say the same thing when I read the title!!!
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93' LX hatch, 460 with mods, TH400, 9" w/ 3.89 spool. Best (so far!) of 10.04 @ 133 mph with 1.36 60' edited: 5-1-2012
Reese,
Been saying single digit coming for 2 years.....it's for sure coming now! lol
Don't worry....it's only a boat anchor! All it said on the dyno was........average!!
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Unread 02-02-2010   #4 (permalink)
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Default

Yeah really bad idea. you can pick up used gear sets for cheap off of ebay from the nascar guys anyways, just get the ratio you want as a matched set.

Just throw the 3.89 gears in there and see how you like it. If you don't do much freeway driving it would be an awesome around town gear. Perfect for the highway too if you have an overdrive.

As a side note, I'm about to swap my 3.50 gears for some 4.10's but I'm not sure if it'll be too much gear for me. 3.89 might be a good medium for me, want to trade for my used 3.50's? I don't know how much shipping would be between Canada and US though.
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Unread 09-24-2010   #5 (permalink)
hotrod32 is offline Rookie


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Default 3.5 3.89 gears

I have some 3.89 richmond gears I would trade straight across for your 3.5's pm sent.
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