Gear question

[1984blue6.2]

I was wondering what a set of 4.10's would do to my truck. Right now its a 6.2/465/208 combo with 3.07 rears. Only reason i ask about 4.10 specifically is because they're free.
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[meatwagon83]

to be honest rpms will go way up and mpg will go way down, your truck will top out at about 55 it being a diesel with probably a 4000 rpm redline, but it will pull a ship down the road at 55, without a trailer. i wouldnt do it, now if it were a gas engine with tall tires i would but with your diesel and its low redline i wouldnt

[79Betty]

Keep them tall one's. my 350 n 4.10's runnin 35's is at 2600 rpm at 55 n i think it's way too much.
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[1984blue6.2]

That's what i thought. I have 33's but i think i just need a 5 speed and a little lower gear like 3.23 or so.
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[INSIDIOUS '86]

My blazer came factory with 3:73 gears and an overdrive. With 4:10s you will want an overdrive or a gearsplitter
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[79Betty]

Could try n find some 3.42's... Probably closest and they come factory in some 3/4 ton's. but they're gettin rare... At least around here they are.
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[Transformula]

WIth the torque of a diesel, you really don't need that much gear reduction, and they want to rev lower, too.

[86c20]

my k30 with 6.2 465 with 4.10 does ok down the highway tires are 285 75 16. top speed at redline of stock 3600 is 91 mph. at 70. she gets high teens for milegle. my c20 with 3.42 and a 350 at 70 i get 22ish with a top speed around 120 at 5k rpm

[meatwagon83]

Originally Posted by 86c20

my k30 with 6.2 465 with 4.10 does ok down the highway tires are 285 75 16. top speed at redline of stock 3600 is 91 mph. at 70. she gets high teens for milegle. my c20 with 3.42 and a 350 at 70 i get 22ish with a top speed around 120 at 5k rpm

you also have semi-tall tires on it, if i recall those tires are about 32 inches tall

[dman1982]

ill take those 4.10's!!!!!!

[74 stepside]

With 33" tall tires, there is nothing wrong with 4.10 gears if you have overdrive. Without overdrive, Id put in 3.73s. My old 75 GMC 3/4 ton had 33" tires and 4.10 rear, drove it daily for 2 years. I cruised it 70 mph on freeway vs. my 99 silverado with same size tires and 4.10 was purfect for the 5 years I drove it..it had overdrive.

[f18delta]

I've got an 85 3/4 ton that has the factory 4.10 gears in it with a TH400. I'm looking at 3000 RPM at 65-70 and getting 10 MPG. I'm going to put in some 3.73's once I can afford to.