Regearing?
Thread Starter
Advanced
Joined: May 2010
Posts: 54
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From: NC
Regearing?
I understand the purpose behind getting a higher gear ratio to get more torque and I have only changed gearing in off-road jeeps when you get into the 33-39 inch tires. My question is on my slightly modified 75 which I don’t do much highway driving and more playing around in town would this make any improvement over stock?
Thread Starter
Advanced
Joined: May 2010
Posts: 54
Likes: 0
From: NC
It is the stock 350 automatic bored .030 over with a mild cam and soon to upgrade the intake and carb. Also planning on a shift kit. I realize it will hurt my fuel mileage but its an in town fun car so it doesnt matter as much. What ratio will give me a better more " agressive " you could say acceleration.
Burning Brakes
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
Shoot for a 10:1 first gear ratio.Your 75 with a TH350 will most likely have a 3.08 rear gear.Your TH350 has a 2.52 1st gear ratio X your rear gear 3.08 = 7.76 first gear ratio not an ideal 1st gear.You can change the rear gears or change the transmission to a have a better first gear and OD.I kept my 3.08 rear gears and installed a Richmond 6spd manual with a 3.27 1st gear and a .76 od 6th gear. Good luck....
Thread Starter
Advanced
Joined: May 2010
Posts: 54
Likes: 0
From: NC
Shoot for a 10:1 first gear ratio.Your 75 with a TH350 will most likely have a 3.08 rear gear.Your TH350 has a 2.52 1st gear ratio X your rear gear 3.08 = 7.76 first gear ratio not an ideal 1st gear.You can change the rear gears or change the transmission to a have a better first gear and OD.I kept my 3.08 rear gears and installed a Richmond 6spd manual with a 3.27 1st gear and a .76 od 6th gear. Good luck....
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Burning Brakes
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
If your gonna keep the TH350 with that 2.52 1st gear you need something around 3.96 rear gears to get that 10:1 launch ratio.However your highway mileage is going to be in the toilet.Hence the suggested OD trans.You can compromise and use a 3.55 rear gear.Another option would be a 700R4 trans from Bowtie Overdrives.You will get a good launch from the 3.06 first gear and you'll have OD.First off you need to know what you have in the rear end before you make any decision's.When I was researching all my options.I felt it was better to spend the money on a OD trans that would match my existing rear gear of 3.08,instead of changing rear gears and still only have a 3spd auto trans....Aloha's