Ford 9" Diff Ratio Change - Buy, Swap & Sell - Ford

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Fastlane » Ford Forums » Buy, Swap & Sell - Ford » Ford 9" Diff Ratio Change

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Crazycat63		#1 Posted : Friday, 7 April 2017 9:15:42 PM(UTC)
Rank: Newbie Reputation: Groups: Registered Joined: 7/04/2017(UTC) Posts: 3 Location: Perth WA		Hi Folks, I have a shortened Ford 9" in an EH Holden and I'm looking to change to something that has a different ratio. I believe the current ratio is at 3.55 and I want to move to around 3.1 I'm running a TH350 auto. Is anyone running similar setup with a V8 auto and 14" wheels who can advise on ratio to select for good balance between acceleration and 100km/hr cruise rpm.


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castellan		#2 Posted : Saturday, 8 April 2017 8:26:08 AM(UTC)
Rank: Veteran Reputation: Groups: Registered Joined: 26/02/2009(UTC) Posts: 1,647 Thanks: 16 times Was thanked: 27 time(s) in 25 post(s)		3.50:1 is the ratio and 3.00:1 you are talking about their. What V8 is it and what mods. If it's a stock or near stock 308 or 350 I would go with the 3.00:1 in a 14in wheel EH to get the best balance performance.


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Crazycat63		#3 Posted : Saturday, 8 April 2017 3:55:22 PM(UTC)
Rank: Newbie Reputation: Groups: Registered Joined: 7/04/2017(UTC) Posts: 3 Location: Perth WA		The engine is a 350 with mild cam so has plenty of horsepower. Thanks for the advice.


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castellan		#4 Posted : Sunday, 9 April 2017 8:13:17 AM(UTC)
Rank: Veteran Reputation: Groups: Registered Joined: 26/02/2009(UTC) Posts: 1,647 Thanks: 16 times Was thanked: 27 time(s) in 25 post(s)		Originally Posted by: Crazycat63 The engine is a 350 with mild cam so has plenty of horsepower. Thanks for the advice. If you want to get off the line a bit quicker look at a higher stall converter and the 3.00:1 should be fine or look for the 3.25:1 gear 9 inch if you drive more around town type driving but out on the highway 3.50:1 could be a bit to low.


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Crazycat63		#5 Posted : Sunday, 9 April 2017 11:34:46 AM(UTC)
Rank: Newbie Reputation: Groups: Registered Joined: 7/04/2017(UTC) Posts: 3 Location: Perth WA		I think I will start searching for parts to go the 3.00:1 ratio option. Most of my driving these days is street cruising or club runs.


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