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So after being advised on here to get 4.56's, I had a gear guy tell me I should get 4.88's. How much higher will my RPM's be on the freeway? (I'm in Socal, freeway speeds = 80-85) I do alot of wheelin, pre-running and chasing, sometimes in nasty Baja sand washes and silt beds, but a lot of freeway miles too. If I get 4.56's now, will i need to regear if I go to 34/35 inch tires and/or the supercharger/urd kit? Also, he recommended the Detroit locker. Is this one always locked or does it automatically sense slippage and lock when needed? It's not electronic, right? Anyway, input would be awesome
 

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Gear ratio depends on what size tires you're running and what engine you have. As far as the locker, Detroit may have an EZ application for our trucks (I know they do for the 4 runner). but I'm not sure why he's "recommending" you go that route.
 

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No ez-locker for generation 3's and no Detroit locker either.


I venture to say this guy who recomended it is from the old school. All the older guys seem to swear by pushrod motors and detroit lockers.

You have a lot of options. The guys with the fat wallets will say ARB is the best and it kinda is. Guys like me will tell you the only way to go is a lunchbox locker. Either lock-rite or no-slip, and I think there is an aussie gear out there that a select few run.

There is a guy on this forum that has claimed 75000+ miles on his no-slip. I'm sure your gear expert has a wealth of knowledge, but so does this forum. Go with the 4.88's and get you a lunchbox locker. What ever gear ratio you get I'm sure you'll be happy with.
 

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BajaRnr12 said:
So after being advised on here to get 4.56's, I had a gear guy tell me I should get 4.88's. How much higher will my RPM's be on the freeway? (I'm in Socal, freeway speeds = 80-85) I do alot of wheelin, pre-running and chasing, sometimes in nasty Baja sand washes and silt beds, but a lot of freeway miles too. If I get 4.56's now, will i need to regear if I go to 34/35 inch tires and/or the supercharger/urd kit? Also, he recommended the Detroit locker. Is this one always locked or does it automatically sense slippage and lock when needed? It's not electronic, right? Anyway, input would be awesome

with a V6 and 33's, then 4.56's will give you better highway mileage than 4.88's, but w/ a 5speed, you'd probally prefer the 4.88's on the trail to give you a lower crawl ratio that will also mean that you're on the clutch less.

that's your call. if you're planning on going up to 35's, then 4.88's will be necessary as a minimum when you make the change.
 

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There is now a Detroit locker for the Toyota 8.4 diff.

If you start with 4.10 gears, and 31 inch tires, and do some math. To keep the same gearing with 33's you need 4.30 gears. To keep the same gearing with 35s you need 4.63's. Check out his web page

http://www.4lo.com/

click on "change tire size".

The typical gear change for the V6 is 4.56's for 33's, and 4.88's for 35's
 
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