4 88 gears on the highway 

Glad I could help! Let me know if you want to see anything else! I can make a video and post it usually same day so just let me know!

really an all round video daily drive and a pull from 20 would be great. Im getting 4:88 installed in my 06 silverado on 37s right now. I will end up posting a few vids also since no one on youtube really has about this ratio for a lifted truck. And many think its to much gear for a 37 when its really perfect for a 37 i have been told.

For 37's, I think it's the perfect gear. In my case, I'm rocking 33" and its overkill. but man the torque is always there. I will work on the video tomorrow morning! If you haven't subbed already, please do and I'll get it posted here in the next day or two! I'll wait for the daylight. I have a bit more issues to deal with here and there with pulls regarding my stock tune, (keeps falling on its face), but I will do my best to show you.

yeah 33s with 4:88 are overkill for sure, a little overkill for a 37 also on hwy speeds but its damn worth the torque there. they say 4:56 is "stock" for my truck on 37. but i went a little extra on the performance edge. its a truck not a prius i didnt build for gas milage. I still get 13mpg (got 13.9 stock, 12.2 37s and 3:73 gear) so overall i gained milage on my factory tune still. After tune by a buddy here i get all my trucks tune i should see 14.5-16. My tahoe was a pig with factory tune and 35 stock gears and he woke that truck up and made better milage by 3-4mpg so i know ill see the same here. plus gears. shits about to be fast. the 4:88s so far in my truck are great. so much low end power but yet i dont struggle a 75mph hwy trip either anymore. acceleration and all is now faster than it was stock on 31s!. Plus a tune coming soon. loving how the torque is right at the pedal now.

Glad to hear!!! I've been shooting videos on it lately, but one of them didn't come out the way I had planned.. So I'll keep updating them and post a new one!

very true. Thanks for the comment! I'll be throwing some larger tires on there soon which will help with daily use, but i do enjoy the slower crawl in low range.

Yea, it grows on you. Just have to change your driving style really. Drove it 1000 miles going 80 and it was at 3100ish. Got barely 10mpg which I was impressed with.

3k rpm for 15 hours is quite alot for a 454 haha Its one of the primary reasons I want to get 37's on it to help counteract it. IF you're interested in doing this, you have to get it tuned. even if you don't care about the speedo accuracy. The speed limiter is 98 according to the speedo. After the regear, 98 was actually to 70. I couldn't remove it (amature at HP Tuners) so I just raised it to Mach 1, and did some math to get the speedo somewhat accurate. problem solved.

haha yea I think it was too overkill. There's also 4.56 that might be a good option as well?

If you really don't care go 4.88's they're really fun

Thanks for asking. Stock, I was at 2000 rpm at 65 now I am 500 rpm higher. I was stock 4.10, and went up to 4.88. I would be happy to make another video for you! I haven't done much lately. I can go about 85 before I say that's enough lol. But I can set up camera and get the info for you. I have no regrets, especially when towing. But I'm also locked up in the rear for off roading, so it's perfect for me.

That answered my question. Thanks. The calculators are pretty spot on it seems and I'll be OK.

haha. well for the 454, it was overkill. You may need the 4.88's to keep your 4l60e happy. They're not known for their toughness unfortunately.

So I've never owned a 6.0, but I konw they're powerful engines. You don't need 4.88's. If I'm honest, that was the biggest mistake I've done. It completely destroyed the daily drive. I went too far. If you're asking for my opinion, and you're going up 2 inches on the tire, you don't really need to change anything, but anything in the 4's would be an upgrade. If you're on the highway a lot and don't tow anything, I would look at 4.10's. 4.56 if you tow occasionally, and 4.88 if you tow often. If you take it off road, I'd look into the 4.56 to get the lower torque and helps lessen the load off the drivetrain. Obviously, the higher size tire you go, the lower RPM you will have which will affect the way it'll accelerate. If you go 35's with 4.10's, you will essentially have the same performance you have with the 33's, and gain about 100rpm on highway speeds. If you keep the 33's with 4.10's, you'll lose about 150 RPM on highway speeds. So in a nutshell, it depends on what you're goal is for the truck. If you're on the highways all the time, run the 3.73's for a bit and if it affects you a ton, consider 4.10's. I feel 4.56 might be a bit too much for the daily commute. you'll be about 500-600 rpm higher on the cruise you have now. Keep in mind, you'll really want to tune the speedo. Most GM's govern at 98. your speedo will hit 98 when you're really doing 80 because of the gear change. Found that out the hard way... Couldn't remove it, so I raised it to 600mph. never had a problem since haha. The higher gearing you go, the lower fuel economy you'll get. I used to get 13, it went down to 9-10mpg with the 4.88.

@Sean R thank you for your help I think I will be going with the 4.56 just so I don’t have to redo my gears again after the lift and bigger tires. I appreciate the help

@@ggsupplies310 You won't be dissapointed! Just be prepared for the new gas bill haha

I mean, it's a big jump from 3.73 to 4.88. Do some calculations first if you want. I went from 4.10s to 4.88s and think it was way overkill. 4.56 may be a good set for you. My 454 was quite tired

@@SR-cp1eo it's got a 7.5 inch lift with 35s and I plan on going to 37s. It's not a daily driver it's more of a summer show truck

@@Weeeeefox well heck, play with it then haha! I know the transfer case is pretty weak, may get a crawler case of some type and actually get a decent low range. May as well throw in a 4l80e in there also

Sounds like a sturdy build! But are you on stock axels?

@@SR-cp1eo definitely not my father installed strange axles there hi performance drag racing axles..

Very nice. Yea I was about to say those things must be hanging on by a thread haha! Enjoy it! I miss this thing every day...

Will the stock locker except 5.13 and 4.88 or that take after market diff

I used HP tuners and changed the speedo that way. Did the math and adjusted accordingly. I recommend just going to a gear and axel shop that has the tools for that, if you don't have HP Tuners.

Running 285/75r16's (33") Mickey Thompsons MTZp3. I probably should have mentioned that. ill put it in the description.

DO you have a 4L80E transmission? that's the only thing I can see that would be off. Different final drive

@@SR-cp1eo yea...i have a 03 2500hd 6.0 with 4.10s and 285/70-17 which is the equivalent of a 33x12.5

@@HioSSilver1999 Interesting. Not sure what to say. I don't know much about the later transmissions. I don't think they're the same internally. Still nearly indestructible. but you shouldn't be turning 2500 rpm doing 65mph. to me, that sounds like it's not locking up. Not too sure. also not going to pretend like I know everything because I really don't lol

@@SR-cp1eo im about 2500rpm at 70mph and almost 2000 at 60. With stock tires it was like 2700 at 70. Converter is locked. I have thought about going to 4.88. Have you pulled anything heavy yet?

@@HioSSilver1999 I did, 9800 lbs, did fine, but not gonna lie, it was still very underpowered. I think my 454 was tired. I feel like it didn't make too much of a difference. The only real difference was from a stop to 10mph. That's it. Everything else was about the same.

Haha. Well well having the ability to pull a house off its foundation is kindof nice. You know, when you need to do that sort of thing.

Pfffffft lmao...those barly pull a trailer with lawnmower on it

probably barley pull itself off the line..lol

Thank you for your comment, but you're wrong. I had to tune the ECU to calibrate the speedo. It was about 25+ mph off going 70mph on GPS speed. Not to mention it would hit the governor as the speedometer would read 98mph and GPS at ~70mph. The passing Priuses is another sign that re-gearing does in fact change your speedometer. Again, thanks for the comment, I'd love to hear your reasoning.