456 gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jwalt2gfd · 12-03-2016, 08:16 PM

Let me know your thoughts on 456 gears, with 34" tires, and an overdrive tranny. Has anyone used this combo?

**The Rocknrod** · 12-03-2016, 08:29 PM

Ohhh dats da kine rite there.

Whew, sometimes I think I spent waaaaay too much time off shore.

VonDog · 12-03-2016, 08:45 PM

Agree with Rocknrod! I have about the same but no overdrive

**pimpston65** · 12-03-2016, 10:05 PM

Quote:

Originally Posted by jwalt2gfd

Let me know your thoughts on 456 gears, with 34" tires, and an overdrive tranny. Has anyone used this combo?

456 is a lot o gear, thats street/strip domain!!!

LVPhotos · 12-03-2016, 10:23 PM

Perfect. Should be in the 2400 rpm range in 1:1(3Rd/4th) @ 55. Depending on OD auto or manual ratio. Mine is .69 so 75 is 2000 rpm on 315/70/17 (34.4") but 3.73
Also depends on final goal of truck.
Size and power of motor.

**jocko** · 12-03-2016, 11:06 PM

Not a bad combo for highway cruising - but 1st gear will get you about 10 ft before it's time to shift into 2nd, depending on which o/d trans you have. You can always start off in 2nd too. If manual, like an NV, I don't know off the top of my head what 1st gear is, but this chart will give you an idea of the o/d effect.

Do you already have the 4.56? If not, I'd recommend 4.10 (but no higher (lower numerically) or it will start to lug the motor at lower highway speeds).

12-03-2016, 08:16 PM	#1
jwalt2gfd Registered User Join Date: Apr 2013 Location: Peoria, Arizona Posts: 24	456 gears Let me know your thoughts on 456 gears, with 34" tires, and an overdrive tranny. Has anyone used this combo?

12-03-2016, 08:29 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 456 gears Ohhh dats da kine rite there. Whew, sometimes I think I spent waaaaay too much time off shore. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

12-03-2016, 08:45 PM	#3
VonDog Registered User Join Date: Jul 2013 Location: Phoenix, AZ Posts: 348	Re: 456 gears Agree with Rocknrod! I have about the same but no overdrive __________________ 60 K20, eaton HO52, T221, SM420, Dana 44 closed 78 K20 Burb, 14 bolt, NP205, SM465, Dana 44 open 05 Dodge Ram 2500 5.9 Cummins 4x4

12-03-2016, 10:23 PM	#5
LVPhotos Registered User Join Date: Jan 2013 Location: Las Vegas, NV Posts: 1,853	Re: 456 gears Perfect. Should be in the 2400 rpm range in 1:1(3Rd/4th) @ 55. Depending on OD auto or manual ratio. Mine is .69 so 75 is 2000 rpm on 315/70/17 (34.4") but 3.73 Also depends on final goal of truck. Size and power of motor. __________________ 1962 shortbed 408cui small block, TKO 600 5-speed, bagged Porterbuilt suspension. 18" Salt Flats http://www.cardomain.com/ride/332579...t-c-k-pick-up/ http://67-72chevytrucks.com/vboard/s...d.php?t=560081

12-03-2016, 11:06 PM	#6
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,943	Re: 456 gears Not a bad combo for highway cruising - but 1st gear will get you about 10 ft before it's time to shift into 2nd, depending on which o/d trans you have. You can always start off in 2nd too. If manual, like an NV, I don't know off the top of my head what 1st gear is, but this chart will give you an idea of the o/d effect. Do you already have the 4.56? If not, I'd recommend 4.10 (but no higher (lower numerically) or it will start to lug the motor at lower highway speeds). Attached Images Last edited by jocko; 12-03-2016 at 11:12 PM.



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