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| 904 gearing https://slantsix.org/forum/viewtopic.php?t=29019 |
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| Author: | wjajr [ Sun May 18, 2008 7:01 pm ] |
| Post subject: | 904 gearing |
Are there different gear ratios that can be fitted to a 904 Automatic transmission? If so, how can one calculate what the transmission has for a gear ratio. Presently I have a 3.55:1 8 3/4 rear end. My goal is to create a taller final ratio by transmission recalibration to improve gas milage. I know, I can hear you; "just change the rear end". My 904 currently is fitted with a reverse valve body, and needs to be returned to normal operation. In this case a change of transmission gear ratio would be easer if possible. |
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| Author: | SlantSixDan [ Sun May 18, 2008 7:16 pm ] |
| Post subject: | Re: 904 gearing |
There are only two ratio sets available. Through 1980, the ratios were: 2.45, 1.45, 1.00 Starting in 1981, the ratios were: 2.74, 1.54, 1.00 |
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| Author: | Joshie225 [ Sun May 18, 2008 7:43 pm ] |
| Post subject: | |
As you can see by the info Dan posted there is no change possible to the final (high gear) ratio of the A904 as it's direct drive. You're stuck with a rear axle gear change, adding an overdrive or changing to an overdrive transmission. The only overdrive transmission that directly bolts up is the A833OD manual 4-speed. Adding a Gear Vendors OD to the A904 is also possible, but expensive. |
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| Author: | Bren67Cuda904 [ Sun May 18, 2008 8:04 pm ] |
| Post subject: | |
Go with the Gear Vendors overdrive. It's spendy buy you'll really like it. Your final drive would be like having a 2.77 gear with it. |
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| Author: | wjajr [ Sun May 18, 2008 8:23 pm ] |
| Post subject: | |
Maybe I'll liberate two of the 17" wheels shod with P235/65 rubber on the wife's Nitro... That would change the ratio a bit. What was I thinking... Any damn fool knows that these old three speed transmissions have a 1.00 final drive. Gezz... I must have spent too much time clay baring & waxing the fleet today. Sorry to waste everyone's time. Smicomatose Maineac |
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