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will switching diff ratio (4'1 for example) noticably effect my speed or acceleration

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Old 04-03-2013, 03:15 AM   #1
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will switching diff ratio (4'1 for example) noticably effect my speed or acceleration

I find myself on lots of steep hills with my 2.7. Although its a great-strong engine, hills are not its best friend + I tow a trailer regularly. Will changing diff gears effect my speed but give me more power? If it will negatively effect my speed I might as well just shift down right? Any advice would be appreciated.
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Old 04-03-2013, 05:02 AM   #2
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will switching diff ratio (4'1 for example) noticably effect my speed or acce...

Change the gears in the rear end not transfer....
The 4-1 would be talking about the gear ratio in transfer. If you change gears it will pull better but you would be running higher RPM's. I plan on gearing mine but I'm doing it for the off road, bigger tires reason.
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Old 04-03-2013, 05:47 AM   #3
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I havent had any problems off roading other than the very stiff suspension. My problems are long, steep hills. Keeping it in 4th gets difficult (freeway) and I have to rev high in 3rd if I wanna keep at 65-70
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Old 04-03-2013, 07:34 AM   #4
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Try this gear ratio calculator. You can set desired speeds, RPM, etc.
It has been very helpful in my Jeep build

http://www.grimmjeeper.com/gears.html

Bacon
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Old 04-03-2013, 08:15 PM   #5
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You put Prunner in your info, is your Tacoma a Pre-runner then? If so you already have 4.10's in the diffs. The easiest way to know if to count you lugs. Since you are a 4 cyl, if you are a 5 lug you have 3.31's if manual and 3.58's if auto, if you are a 6 lug then you have 4.10's.

Oh and to answer your question. Yes you will have a lot more power with lower gears. I went to 4.88's and I have no complaints. It pulls hard now! But I also have the V6.
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Old 04-04-2013, 12:18 PM   #6
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Quote:
Originally Posted by BradyT88 View Post
You put Prunner in your info, is your Tacoma a Pre-runner then? If so you already have 4.10's in the diffs. The easiest way to know if to count you lugs. Since you are a 4 cyl, if you are a 5 lug you have 3.31's if manual and 3.58's if auto, if you are a 6 lug then you have 4.10's.

Oh and to answer your question. Yes you will have a lot more power with lower gears. I went to 4.88's and I have no complaints. It pulls hard now! But I also have the V6.
Its a 6 lug. How did the change affect your gas milage? What about freeway driving? How's that? Rpms at 65? What are they?
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Old 04-04-2013, 12:26 PM   #7
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Quote:
Originally Posted by ChrisGralnic View Post
Its a 6 lug. How did the change affect your gas milage? What about freeway driving? How's that? Rpms at 65? What are they?
I just did about a 1000 mile round trip to CO from ID and I averaged 17-18 mpg and that was setting the cruise for 5mph over, so I was doing 80mph for half the trip and 70mph through the hills and such. I was impressed still so regearing didn't seem to hurt my mileage at all.

I run about 2400rpm at 65mph but I am also on 33" tires and have a different overdrive gear ratio than you.
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Old 04-04-2013, 12:33 PM   #8
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Quote:
Originally Posted by BradyT88 View Post
I just did about a 1000 mile round trip to CO from ID and I averaged 17-18 mpg and that was setting the cruise for 5mph over, so I was doing 80mph for half the trip and 70mph through the hills and such. I was impressed still so regearing didn't seem to hurt my mileage at all.

I run about 2400rpm at 65mph but I am also on 33" tires and have a different overdrive gear ratio than you.
Yeah you're in a v6. My 4banger has no overdrive. Unless you consider 5th gear overdrive. At 65 I am at exactly 2500 revs. At 3000 I am at 80. So for every 500 revs in 5th I gain 15 mph. My truck gets horrible gas milage anything over 75. Probably cause the lift fucks with aerodynamics a bit.
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Old 04-04-2013, 12:38 PM   #9
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Quote:
Originally Posted by ChrisGralnic View Post
Yeah you're in a v6. My 4banger has no overdrive. Unless you consider 5th gear overdrive. At 65 I am at exactly 2500 revs. At 3000 I am at 80. So for every 500 revs in 5th I gain 15 mph. My truck gets horrible gas milage anything over 75. Probably cause the lift fucks with aerodynamics a bit.
Oh yeah... forgot you were a manual... That would make your rpm a lot higher than mine. Your 5th gear is an overdrive though. Anything high geared than 1:1 is overdrive. My 5th is 0.716:1 and your 5th is 0.85:1 or 0.84:1 can't remember for sure. Both of our 4th gears are 1:1 though.
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Old 04-04-2013, 12:58 PM   #10
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Quote:
Originally Posted by BradyT88 View Post
Oh yeah... forgot you were a manual... That would make your rpm a lot higher than mine. Your 5th gear is an overdrive though. Anything high geared than 1:1 is overdrive. My 5th is 0.716:1 and your 5th is 0.85:1 or 0.84:1 can't remember for sure. Both of our 4th gears are 1:1 though.
I'd like eventually to change my gearing to be a little closer. I feel like 3rd and 4th on mine are so far apart from eachother. 4th gear is my save gas gear I'll cruise down the road at 40 in 4th at about 1400 revs.
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