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Old 07-06-2011, 05:00 PM
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88 Mustang GT , install 4:10 gear or not?

Im putting a 351W in a 88 Mustang GT. I was planning on getting 3:73 gears, but I can get a set of 4:10 gears for free. How would those 4:10 work out with the 351? It's not a daily driver, just a little weekend toy. The trans is a T5 for now. Should I try the 4:10s are stick with the 3:73. Right now, the car has 4:56 gears which is how I bought it. My top end speed is like 50 mph.

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Old 07-06-2011, 05:14 PM
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Tire size?
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Old 07-06-2011, 05:21 PM
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3:73s are really good set of gears for that car ex-specially if you are going to be driving very much. JMO I had a set in my 89 and with the 5-speed i really like them. But tire size does make a difference on which gears would be best for you app, so what tire size are you going to be running on it ?


Cole
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Old 07-06-2011, 05:27 PM
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Re

Right now, they are 225/60/15. I may go with a wider tire, but I think I'm going to stick with the 15 in. tire. Would you recommende going with a bigger tire?
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Old 07-06-2011, 07:23 PM
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Thats a 25.5" tall tire and a light car.

A taller tire would let you "get away" with a lower gear ratio all else equal. I wouldent want that low of a ratio myself especially with that short of a tire.

If I were driving around town all the time I would shoot for the lower ratio. If I was going to see a lot of freeway I would go for a higher ratio.

You are just going to have to look at some calculators and do some thinking.
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Old 07-06-2011, 07:49 PM
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Re

Thanks for the reply, but you kind of confused me there. So you would like the 4:10 gears for around town, and go with the 3:37 for highway?
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Old 07-06-2011, 08:50 PM
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Quote:
Originally Posted by Mac88
Thanks for the reply, but you kind of confused me there. So you would like the 4:10 gears for around town, and go with the 3:37 for highway?
I would want a lower ratio if I were doing around town driving and a higher ratio if I were doing a lot of freeway driving.

Exact numbers depend on too many things. You will have to look at the powerband of the engine, transmission gearing, tire size etc. and look at what rpm the differential gears put you at and see if the combo works. Driving style, fuel economy, vehicle weight and other things need to be considered too.
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Old 07-06-2011, 09:41 PM
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Quote:
Originally Posted by Mac88
So you would like the 4:10 gears for around town, and go with the 3:37 for highway?
Yes.........Exactly. I'm not familiar with your T-5 but if 5th gear is OD, you can get away with the 4:10's on the hwy.
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Old 07-06-2011, 10:21 PM
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As said earlier,if you have overdrive you can get away with the 4.10 gear but if you are not going to a taller tire I would go with the 3.73 gear.The width of your rear tires does not effect your RPM but how tall your tire is does. Taller tire = less RPM and vise versa.A taller tire of same compound rubber will give you better traction.I would put a taller tire and go with the 4.10 gears,I like the look of taller tires.JMHO.
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Old 07-06-2011, 11:47 PM
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Is the 351 stock or warmed up at all? A stock or mild engines power band is relatively low in the rpm range and putting to low a gear can make for a lot of extra shifting. You can get through the power band too quickly which isn't enjoyable. Something to consider instead of just throwing the lowest gear in you can just because you have overdrive.
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Old 07-07-2011, 09:46 AM
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Old 07-07-2011, 04:16 PM
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Old 07-07-2011, 06:37 PM
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Re

Makes sense. I think I will go up to a 16 in wheel and try the 4:10 gears and see how it works out.
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Old 07-07-2011, 07:57 PM
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Quote:
Originally Posted by Mac88
Makes sense. I think I will go up to a 16 in wheel and try the 4:10 gears and see how it works out.
How about just get a taller 15" tire instead of tire and wheel? The 16" wheel itself isn't going to do anything except cost more money. Is the 15" wheels you have now not big enough for a wider 15" tire?
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Old 07-08-2011, 06:48 AM
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Quote:
Originally Posted by sqzbox
How about just get a taller 15" tire instead of tire and wheel? The 16" wheel itself isn't going to do anything except cost more money. Is the 15" wheels you have now not big enough for a wider 15" tire?
You are right about the taller wheel just costing more money but a wider tire is not going to help with RPM. He needs a taller tire.The overall tire height must be taller to lower the RPM with the lower gear ratio plus it will put a bigger foot print on the ground for more traction.
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