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| Rear gear ratio https://slantsix.org/forum/viewtopic.php?t=23463 |
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| Author: | Seattle07 [ Sun Jun 03, 2007 10:40 pm ] |
| Post subject: | Rear gear ratio |
I have a 75 plymouth valiant, and I want to swap the rear gear ratio. I want a little more torque while city driving, and I dont drive on the highway much. I think its a 2.76, and I want a 3.23. Is this a hard thing to do, what does it involve? and will it kill my gas mileage? |
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| Author: | icaneat50eggs [ Mon Jun 04, 2007 12:34 am ] |
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What rear is in it now? The 3/23 gears would probably help the gas milage in town. |
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| Author: | Seattle07 [ Mon Jun 04, 2007 8:40 am ] |
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I'm pretty sure that its 2.76, thats standard right? Where could I get a 3.23? |
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| Author: | Aggressive Ted [ Tue Jun 05, 2007 7:36 am ] |
| Post subject: | |
What rear do you have? 7 1/4? - 8 3/4? etc. There are 4 different types. My 74 Dart has an 8 3/4 2.76 Posi. I had Randy's Ring and Pinion set it up. My car had a 3.23 7 1/4. Mileage was 18 mpg average with the 3.23. With the 2.76 I am getting 22.5 mixed city and freeway. If you want more torque, upgrade the exhaust. I just went to 2.25" single pipe from the stock 1.5". It made a huge difference in useable power. Both tires will break loose at the slightest aggressive acceleration. Before it was a slug. Don't get me wrong, getting another $100 rear-end from the junkyard is simple but I went through (3) in 5 years because of the twisty roads I drive on at 120 miles a day. |
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| Author: | Jeb [ Tue Jun 05, 2007 7:53 am ] |
| Post subject: | |
With it being a 75 he probably has a 7 1/4 or 8 1/4. Easiest thing for you to do would be find another rear in a junkyard that has the ratio that you want. It is getting hard to find a shop that will set up rears properly. I have an 8 1/4 rear that I plan on getting rebuilt with 3.23 gears to replace the 2.76 rear I have under my Duster now. Even with the 2.76 gears highway mileage isn't all that great and around town it is not very lively, especially if you pull out and try to climb a hill. |
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| Author: | Aggressive Ted [ Wed Jun 06, 2007 12:45 pm ] |
| Post subject: | |
Torque really kicks in a 2000 rpm, so for city driving you need to figure on at least achieving that rpm. So base your rear-end choice on that, plus the bigger 2.25" pipe really helps with response time going up hills. My car has lots of power pulling hills once I hit 2000 rpm with the 2.76 rear. On the really steep hills in Seattle leave it in second gear, like on Queen Anne. You will easily be going over the speed limit at the top. Every night on the way home on I-90 to Issaquah I start out at 35 mph at the Factoria underpass and easily hit 70 about half way up the hill. With a one barrel carb, the bigger exhaust makes a huge difference. |
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