Forum: Hot Heads Tech Talk

ron37

Gear Ratio

I have a 325 hemi in my 1937 Plymouth pickup. Got a 1997 Dodge 5 speed manual trans. I have a 1967 Charger 8 3/4 posi rear end that I am thinking on using. It has 3.23 gears. It was from a car with a V8 4 speed manual trans. I think it had a 383 magnum engine. They were heavier than my pickup. My question is whether this gearing is okay for street and highway driving or do I need lower. Anyone using this ratio without issues? What ratio do you use with standard transmissions in these old toy? I had a 4.11 in another toy with a 4 speed manual and it seemed like I was running a little high on the RPM's on the highways.

on: Mon 30 of Sep, 2019 [19:40 UTC]

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moparruss

Re: Gear Ratio

on: Tue 01 of Oct, 2019 [15:30 UTC]

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I have a 1950 Plymouth Suburban 2 door station wagon with a 1957 Desoto 341 hemi. I have a 1969 B body 8 3/4 rear end with a 3.23 gear set. I run a GM 700R4 trans. In 3rd gear (which is 1/1 ratio) with a 28" diameter rear tire I see 2700 RPM at 70 MPH. In 4th gear (which is over driven .7/1) I see 1900 RPM at 70 MPH. This works great for me. Hope the information helps.

Russ

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Jack

Re: Gear Ratio

on: Tue 01 of Oct, 2019 [15:19 UTC]

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I run 3:91s on my manual overdrive , Its an A833 four speed that is OD in fourth.
Behind a 392 in a heavy 46 Chrysler. Much better than the 3:23s I tried at first..

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George

Re: Gear Ratio

on: Tue 01 of Oct, 2019 [00:51 UTC]

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I once had a '69 Charger with a 383 & 3.23 gears, great car. Never ran a 5 speed stick, but I had a Crown Vic Police Interceptor with a 351/AOD/3.08 If it ran well for the cops I figured it was fine. Yours with 3.23 probably will be. OEM gears were probably in the 3.3-3.5 ratio with a 3 speed stick or 2 speed A/T.

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