Re: Manual Transmission Gearing Question
[Re: Sniper]
#2998747
12/26/21 11:51 PM
12/26/21 11:51 PM
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Joined: Jan 2003
Posts: 11,508 delivering your oil
nutso suave
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 11,508
delivering your oil
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Sniper - I’m not sure what the ratios are in my transmission…I know it’s the version with a flipped shift linkage and that’s about all. I’m curious to know what the ratios might be so I can figure out what gear ratio would be ideal for the rear end.
Edit: I found this on allpar, not sure if there were more options/combinations out there.
Edit 2: this may be what I have…the 74-75 ratios. It isn’t overdrive but I’m not sure how that worked, if all the later transmissions used the flipped linkage. Hmmm.
Last edited by nutso suave; 12/27/21 12:45 AM. Reason: Add picture
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Re: Manual Transmission Gearing Question
[Re: Moparteacher]
#2998853
12/27/21 01:38 PM
12/27/21 01:38 PM
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Joined: May 2019
Posts: 6,326 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,326
nowhere
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FWIW, There are 2 OD gear ratios for that transmission, and the speed gears and counter gear are NOT interchangeable. The gear sets have different pitches. The common Dodge/Plymouth A833OD has a final gear ratio of .73:1. The other version has a final gear ratio of .71:1 (if memory is correct),........or maybe it was .69:1..........Hmmmmm?
I put one in my RR with 4.88s.
I keep hearing this but never see proof. Why would Chrysler make a different set of gears for an infinitesimal difference in ratio? I will admit though, my my OD era parts manuals are thin.
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Re: Manual Transmission Gearing Question
[Re: Sniper]
#2998919
12/27/21 04:02 PM
12/27/21 04:02 PM
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Joined: May 2012
Posts: 1,849 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
Posts: 1,849
South Bend
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FWIW, There are 2 OD gear ratios for that transmission, and the speed gears and counter gear are NOT interchangeable. The gear sets have different pitches. The common Dodge/Plymouth A833OD has a final gear ratio of .73:1. The other version has a final gear ratio of .71:1 (if memory is correct),........or maybe it was .69:1..........Hmmmmm?
I put one in my RR with 4.88s.
I keep hearing this but never see proof. Why would Chrysler make a different set of gears for an infinitesimal difference in ratio? I will admit though, my my OD era parts manuals are thin. They were also sold to GM for use in trucks.
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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Re: Manual Transmission Gearing Question
[Re: nutso suave]
#2999018
12/27/21 09:16 PM
12/27/21 09:16 PM
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Joined: Aug 2003
Posts: 43,307 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,307
Bend,OR USA
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You can verify the ratios with the tranny out of the car or in the car by marking the front driveshaft yoke and the tail shaft housing and having the rear wheels off the ground, remove all the spark plugs and have someone rotate the crankshaft one full rotation with the tranny in the O.D. gear and count the driveshaft revolutions. It should rotate one full revolution and right at 10% (.09) more You can verify any gear ratio by using this method, same thing on the rear end ratio, turn the wheels one full revolution with a posi and count the number of pinion yoke revolutions, if the yoke turns 4 and a little bit more it is 4.10, if it rotates 4 and 1/3 it is a 4.30 ratio, if 3 1/4 it is a 3.23 ratio and so on
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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