Are 4.56 Gears Too Much For The Street?

[@papabapyro8169]

I’m in the process of swapping out my 9” 4:56 gears right now. I have a 4sd no od and a 28” tire. I’m going with a 3:89 gear. I had a solid lift cam that was good past 7000rpm but now I’m running a hydraulic roller that’s done at 6000. I do a little drag racing and I wouldn’t be able to get over 110 mph with the 456s. Cheers

[@DailyDriverGarage]

2001 yukon 2wd 4l60e...18 inch 2023 silverado wheels.. Soon to be 456 gears here

[@NewEdgeDesigns]

I was thinking a 3:90 for my New Edge.. What do you think?? I don’t think Ford racing makes that size, so I could be risking it being noisy..

[@CarGuyV8]

Are you in an auto or manual? I’d say 3.90 should be a good in between gear. I’ve had 3.73s in a manual and an auto mustang. I also had 4.10s in my previous new edge.

[@NewEdgeDesigns]

@@CarGuyV8 manual

[@CarGuyV8]

@@NewEdgeDesigns 3.90s will be great.

[@bluecollarhotrods9781]

I race on a 315/50R17 - roughly 29.4" tall, my street tires are 29.8" tall. 4.56s, 4L80E. It's not for everyone, but works for me. I'm barely 5500 RPM at the stripe at nearly 106 MPH. It peaks around 5700-5800 and barely drops off, not even down 10rwhp at 6400-6500. I swapped from 4.10s and it went faster. Likely could have went with 4.88s to be optimal at the track.

[@CarGuyV8]

I bet that’s quite livable with the overdrive gear. With just 3 I’m really tempted to throw a 3.90 in there.

[@bluecollarhotrods9781]

@@CarGuyV8 it's not terrible, but I try to keep it around 70 MPH max on the interstate. It much prefers rural driving vs highway trips.

[@kkoch666]

Can't go wrong with a 373.

[@DailyDriverGarage]

I have a 373.. But its a turd outta the hole in a 2wd yukon.. Even with a stage 3 BTR...but a beast after 3000rpm

[@junkyardigans6197]

⁠@@DailyDriverGaragedo you have a stall convertor? With stock convertor and a cam depending on when it makes power will slow you down low

[@DailyDriverGarage]

@@junkyardigans6197 ebay 2500-2800 stall. Im just finishing up a 6.0 swap, hopefully it helps

[@musclebone7875]

3.36's

[@ronspencer676]

I have 4.88s in my lifted 97 chevy with 37/13.50/20s and itll go 70 at around a mild 2000rpm. And it'll run with most early 6.0s and 5.7 hemis It's a 5.0 4l60e 4wd extended cab too

[@zAvAvAz]

Hey awesome camaro, love the 4.56 gears and 305 at 5800 rpm. What if you got a TKO 600 road race 5 speed it has O.86 5th gear overdrive. What should i am do with a 355 ? i am was thinking a smaller cam like the xr258 or crower or lunati equivalent. Promaxx freedom series 185cc aluminum heads. EPS intake. 10.22:1 static compression, 8.5:1 dynamic. Tri Y headers. Of course i am could go the other way also and go to 6500 rpm with XR282 or XR288 cam and or 383 stroker or whatever, i am just think the mild 355 would get good fueL economy at low speeds, and with a 'part throttle circuit' added to the holley. Have only a stock 355 with lazy 290 cam and EPS intake, no compression, and TH350 in manual car right now with 2.70:1 gears in gm 10 bolt 8.5" posi rear end.

[@CarGuyV8]

Thanks. The .86 5th would add about 10-15 mph to your comfortable cruising speed. If you’re concerned about fuel mileage than do the mild setup. I’ve personally ran a xr282 in a afr headed 355. Tons of fun.

[@orrdeusarmy]

I have a 71 Camaro with 15" wheels, running a Turbo 350 with a 4500 stall converter. 10 Bolt posi with 456 gears. Try to see if it would last on the highway for any length of time? Thanks

[@CarGuyV8]

I cruised at about 60 with it for 5-10 minutes at a time at 3,500 rpm. That’s about the fastest I’ve cruised.

[@85gbody97]

They base all gear ratios off a 26” tall tire so if ya had a 5 speed manual or 700r4 or even a 4l80 ya could get away with a 4.56 pretty easy with a 28-29” tire but if ya got real short tires on there it’s going to be little rough an your never going on the freeway not unless ya wanna run the crap out your motor and that’s saying it don’t blow up from that consistent high rpm. Unless ya built a damn nascar engine your not going to last an even those engines only go 500 miles

[@CarGuyV8]

Exactly. That’s why I was basing my opinion on using popular 275/60/15 28” tires.

[@markbogle8062]

It really depend on the tire size and trans mission

[@nashvilleoutlaw]

I'm going to run a 3.25 in my el camino with 26" tires. If you compare 1st gear in transmissions. A 700r4"s 1st gear with a 3.5 gear would be the equivalent to running a th350 with a 4.56 as far as 1st gear is concerned. A 3.25 is the equivalent to running a nonexistent 4.00 gear with a th350. I'm not building mine to race and prefer to cruise about 80 on the interstate. It'll still obliterate street tires regardless 😂😂 I'm not running a 700r4 but it's a manual 4 speed that has almost identical gear ratios as a 700r4.

[@CarGuyV8]

With a 4 speed those 3.25s will definitely help you keep the rpms lower on the highway. Thanks for watching 👍

[@nashvilleoutlaw]

@@CarGuyV8 i need to correct you here incase someone reads this, technically a manual 3 speed with overdrive. All American manual 3 and 4 speed transmissions that I'm aware of from the 90's back, Drive/high gear is 1:1. Except for the Chrysler 833a and the GM my6/np440. Anything lower numerically than 1:1 is overdrive. Just incase someone reads this and thinks a normal 4 speed gives you better highway rpms. Most gm 3 and 4 speeds have a mid 2.00 1st gear and 1:1 top gear. so the only thing you gain from going from a 3 speed to a 4 speed is an extra gear between 1st and high gear unless it's a 3 speed with overdrive like mine or a 5 or 6 speed. I have an oddball that GM contracted Chrysler to make in the 80's. It's basically an Aluminum Chrysler 833a that accepts a standard chevy bellhousing.

[@CarGuyV8]

@@nashvilleoutlaw I wasn’t very clear with my first reply. You said it had similar gears to a 700r4. Here’s what I meant, with the higher numerical 1-3rd gears of the 4 speed manual, the 3.25 was a good choice that will help keep the rpms lower at highway speeds with the 1:1 gear. Vs running a 3.73 or so rear gear with a th350 to get the same 1st gear punch with a 2.52 1st gear but turning 500 rpms or so higher on the highway. Thanks for the reply and feedback, I can see how someone could be confused with my first reply.

[@nashvilleoutlaw]

@@CarGuyV8 if you have have an older android there is an app called "gear speed calculator". It let's you compare different transmission, tire and gear set ups side by side up to a 6 speed in all gears at once. Unfortunately the creator passed so it hasn't been updated for newer phones. I still have an old galaxy 5 that allows me to get to the menu to change the rpm ranges, steps and save transmission gear ratios for quick reference. Like a 700r4 with a 2.73 gear is the equivalent to a 2 speed powerglid with 4.56's in 1st and 2nd but with dual overdrive lol gearing is crazy

[@ryanthorpe7403]

What gear size do you recommend for an 2008 crown vic? It currently have 3:27 lsd 4 speed auto transmission but the car is 4,000 pounds and i would like to have more get up?

[@CarGuyV8]

Definitely 4.10s. You will gain about 600 rpms at highway speeds though. I’ve done the 3.27 to 4.10 swap in a 4.6 4 speed Mustang GT before.

[@ryanthorpe7403]

So 3:73 gear set may have me wanting more gear maybe?

[@kobewade8709]

Gear Vendor's overdrive can solve a lot of problems! With short gears!

[@GJ-DT]

You're going to be at 3,500 with 4.10s. if your car needs 456s to feel fast you need a lot more motor. If your car doesn't have that much motor you can actually go slower with 4: 56s.

[@evilinside5984]

@GJ-DT- Its about matching the gear ratio, to your combination. Its not about power, as much as the rpm powerband of the engine, rear gear ratio, tire ht., transmission, ( w/O.D., or not ), Tq. Converter stall speed, ( if automatic ), weight of the vehicle, & intended use.

[@fstarockaburns425]

i was convinced at 25s - no need for the rest of the vid. Ordering 4.56 asap-

[@CarGuyV8]

😂 I should’ve put that pull at the end to drive my watch time up!

[@fstarockaburns425]

@@CarGuyV8 56 gears arrived yesterday cant wait to smoke those posi'd stickies!

[@CarGuyV8]

@@fstarockaburns425 awesome. Let me know how you like them

[@alogeetaylor3365]

Hey I have a 355 with a 350 turbo tranny on 24 inch rims would a 4:56 gear work well??? Would you recommend???

[@CarGuyV8]

What are your plans for the vehicle? 4.56 would put you at around 3,800 rpm at 60 mph in 3rd gear. I would not recommend.

[@alogeetaylor3365]

@@CarGuyV8 street driver maybe a short hwy run. But I thought you said the bigger the rim would be good for a 4:56. 24 inch rim feom ground up came out to a 28 tire.

[@CarGuyV8]

@@alogeetaylor3365 the bigger the tire, not rim. A 28” tire is what I was running on mine. 60 mph was about 3,400 rpm.

[@alogeetaylor3365]

@@CarGuyV8 your right. Mines is a 305/35/24 puts me at a 32 inch tire.

[@CarGuyV8]

@@alogeetaylor3365 Yeah I think these gears will be great with that tire size. It’ll accelerate hard out of the hole and you’ll be right at 3k rpm at 60.

[@sobercompanionnyc-losangeles]

I have 3.73 in my 2001 GT

[@CarGuyV8]

That’s a good gear ratio.

[@musclebone7875]

3.36's are the best street gears