another beat on ?
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#7
You're in a funny spot gear to tires, IMO. If you don't mind trading a little MPG's for some extra grunt down low, go 4.56 gears. That'll also help out a bit while wheeling. You'll like the power.
4.10's will give you less torque down low, but raise the MPG's a bit. You can go that route if your a fuel miser type. The front carrier will need to be changed out for both 4.10s and 4.56s, the rear carrier will be fine. they also make a thick gear in both the 4.10 and the 4.56 gear that should allow you to use the stock carrier up front. They cost a bit more, but you don't have to buy a new carrier. Yukon makes a darn fine aftermarket gear with great install instructions. I recommend Randy's Ring and Pinion for the purchase.
MOST IMPORTANT POINT: go to a shop that knows what they are doing. I went to a 4wheelparts and they completely hosed the gear install. $750 pissed away.
At 60 mph in OD (0.69) for stock height tires (225X75X16 or 29.3") and stock gear ratio (3.55) your RPMs would be 1685
for 35" tires at 4.10 ratio and 60mph in OD the RPM's would be 1630 this is closest to the stock ratio you can get and it'll feel like the truck when you bought it
for 35" tires at 4.56 ratio and 60 mph in OD the RPM's would be 1812 -this is higher RPM's so you be up into the power band a little more. It'll pull a lot harder from a dead stop, but if you are a speeder, you'l notice a little more engine noise up at the top speeds as it's revving higher.
I run 4.10 gears on 30.6" tires and at 60mph on OD my RPM's are 1864. I LOVE the power and don't miss the 1mpg it cost me. If you're driving a 318, you'll appreciate the extra torque down low. It'll make a stock 318 run with a stock 360.
4.10's will give you less torque down low, but raise the MPG's a bit. You can go that route if your a fuel miser type. The front carrier will need to be changed out for both 4.10s and 4.56s, the rear carrier will be fine. they also make a thick gear in both the 4.10 and the 4.56 gear that should allow you to use the stock carrier up front. They cost a bit more, but you don't have to buy a new carrier. Yukon makes a darn fine aftermarket gear with great install instructions. I recommend Randy's Ring and Pinion for the purchase.
MOST IMPORTANT POINT: go to a shop that knows what they are doing. I went to a 4wheelparts and they completely hosed the gear install. $750 pissed away.
At 60 mph in OD (0.69) for stock height tires (225X75X16 or 29.3") and stock gear ratio (3.55) your RPMs would be 1685
for 35" tires at 4.10 ratio and 60mph in OD the RPM's would be 1630 this is closest to the stock ratio you can get and it'll feel like the truck when you bought it
for 35" tires at 4.56 ratio and 60 mph in OD the RPM's would be 1812 -this is higher RPM's so you be up into the power band a little more. It'll pull a lot harder from a dead stop, but if you are a speeder, you'l notice a little more engine noise up at the top speeds as it's revving higher.
I run 4.10 gears on 30.6" tires and at 60mph on OD my RPM's are 1864. I LOVE the power and don't miss the 1mpg it cost me. If you're driving a 318, you'll appreciate the extra torque down low. It'll make a stock 318 run with a stock 360.
Last edited by aim4squirrels; 04-12-2009 at 09:04 AM.
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#8
I've had both 4.10 and 4.56 with my 35's, and it isn't even a contest. 4.56 was the best way to go by far. 4.10's were great with 285's, but not with 35's. The truck really struggled maintaining highway speeds. With 4.56, I saw mpg improvement over the 4.10's, and the truck has power in all ranges. I definetly do not recommend 4.10's with 35's.
#9