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Need help selecting speedo gear for OD 4-speed #1153424 01/09/12 09:51 AM 01/09/12 09:51 AM
Joined: Nov 2006 Posts: 664 Stuart, FL G Grassosgarage OP mopar
Grassosgarage OP mopar G Joined: Nov 2006 Posts: 664 Stuart, FL	Ok, I transplanted a 833 OD 4-speed into my '65 Valiant with a 3.21 gear and 225 70 14 tires. The speedo now reads much faster than car is actually going. I don't expect precision accuracy from a '65 Valiant speedo, but anybody have an idea which # of teeth on the gear wil get me close? I don't know if the OD is a factor, or just the change in rear gear. '70 Cuda 440/auto '70 Duster 340/4sp project '70 Satellite convert 318 survivor

Re: Need help selecting speedo gear for OD 4-speed [Re: Grassosgarage] #1153425 01/09/12 10:17 AM 01/09/12 10:17 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	there is a chart in the arcives IIRC i think you need to check whats in there and most liky need a larger gear to slow the speedo down I been grabing the gears out of the JY and have a few now,24-27-35-40 ect.

Re: Need help selecting speedo gear for OD 4-speed [Re: Grassosgarage] #1153426 01/09/12 12:23 PM 01/09/12 12:23 PM
Joined: Jan 2003 Posts: 8,089 Sorrento, BC, Canada 4speeds4me master
4speeds4me master Joined: Jan 2003 Posts: 8,089 Sorrento, BC, Canada	http://www.moparts.org/Tech/tech/pages/speedo.html 2 Demons...no, not my kids!

Re: Need help selecting speedo gear for OD 4-speed [Re: 4speeds4me] #1153427 01/21/12 10:52 PM 01/21/12 10:52 PM
Joined: Nov 2006 Posts: 664 Stuart, FL G Grassosgarage OP mopar
Grassosgarage OP mopar G Joined: Nov 2006 Posts: 664 Stuart, FL	ok, this chart is great but it assumes 4th gear is 1:1. Do these ratios apply to an OD trans?

Re: Need help selecting speedo gear for OD 4-speed [Re: Grassosgarage] #1153428 01/21/12 11:06 PM 01/21/12 11:06 PM
Joined: Nov 2003 Posts: 12,494 Western Colorado High Desert moparmarks I Live Here
moparmarks I Live Here Joined: Nov 2003 Posts: 12,494 Western Colorado High Desert	Quote: ok, this chart is great but it assumes 4th gear is 1:1. Do these ratios apply to an OD trans? Speedo is on the output shaft. Gears have no affect. 72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/ motormangj@gmail.com

Re: Need help selecting speedo gear for OD 4-speed [Re: moparmarks] #1153429 01/21/12 11:08 PM 01/21/12 11:08 PM
Joined: Dec 2003 Posts: 16,844 Phoenix - surface of the sun nomore65BelvJim I Live Here
nomore65BelvJim I Live Here Joined: Dec 2003 Posts: 16,844 Phoenix - surface of the sun	Quote: Quote: ok, this chart is great but it assumes 4th gear is 1:1. Do these ratios apply to an OD trans? Speedo is on the output shaft. Gears have no affect.

Re: Need help selecting speedo gear for OD 4-speed [Re: Grassosgarage] #1153430 01/22/12 12:27 PM 01/22/12 12:27 PM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	real easy way to get in the ballpark... assumes typical 26-27" tires: Take axle ratio. Drop last digit. That's # of teeth needed on speedo pinion! Rick

Re: Need help selecting speedo gear for OD 4-speed [Re: Rick_Ehrenberg] #1153431 01/22/12 03:33 PM 01/22/12 03:33 PM
Joined: Jan 2008 Posts: 1,300 Washington 19cuda73 pro stock
19cuda73 pro stock Joined: Jan 2008 Posts: 1,300 Washington	This chart / guide worked well for me. http://www.mymopar.com/index.php?pid=112 1966 Charger 383 4 speed (Black with Red interior) 1973 Cuda 340 4 speed (Lemontwist) 1972 Corvette

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