4:10 vs 3:73

[Marv02]

I have a 2001 YukonXL 4X4 with 4:10 Factory and 5.3 and I know the 4L60e not the toughest trans out there either.

I was thinking next time I put set of tire on it going with 33 inch tires.

What I come up with it should running 33 inch ties will be like running 3:73 gears in it.

For the ones that have 3:73 in there's is underpowered or is good for a DD.

Will it be a dog going with 33 inch tires I know this a heavy SUV and has a lot of weight to get rolling and keep rolling for the little 5.3 plus the 4L60e.

Or should I just stay with the stock size tires instead.

I have notice now driving down the road I am happy for what it is but towing a 1000 Lb's behind it I can feel the lack of having the HP and TQ.

I know I can't compare this to my old 1997 F350 with a 7.3 Power stroke 4:11 rear end for towing.

I don't tow much with it but where I live we have nasty winds and hill with long climbs.

I really don't want dump $500.00 plus for a set of gears just so I can run 33 inch tires.

 

[TxDrewski]

I have an 04 Z71 with stock 373's. I run 33x13.50 tires with 5" of lift.
Im swapping a motor in a week or two, however If I werent gaining power from the swap (LQ9), I would be installing gears. Its a dog while trying to pass or merge. I also come from the diesel scene, and while there is no substitute for Turbo Charged 6.6, it is a very very far stretch to try and get the same performance out of a naturally aspirated 5.3. The lack of low and mid power is my biggest complaint with my setup.

---------- Post added at 11:17 PM ---------- Previous post was at 11:16 PM ----------

The 5.3 with 33's and 373's works fine, but it leaves alot to be desired.

 

[YukonXL04]

I run 32's with 3.73's and a 5.3 in my xl and honestly it's not bad... Once I got the tune and e fans in it seems to run much better. I have no problems getting up to speed or passing slow ass people lol. From a dead stop... Yeah it's slow lol but he'll it's like 6000lbs so I don't expect much. Once it's moving it runs good.

 

[Mr. 960]

I have an 06 Yukon 4x4 with the 4.10's and a 5.3. I installed heavy ass cooper discoverer AT3 LT275 70 17's. I guess they are like a 32.5 inch tire. The truck ran fine with the stock tires. Once I stepped up to the coopers I could feel a large power loss. I got a Dyno tune and that woke up the truck nicely. It runs comparable to my 06 5.3 ECSB sierra with the 5.3 dyno tune with 3.73's and stock size tires.

 

[Marv02]

How's you're MPG with the bigger tires I was thinking it might be better up on the HWY because the drop in the RPM's.

I know in town the MPG going to drop but most my driving is up on the HWY speeds around 65 and 70 MPH.

I have an 06 Yukon 4x4 with the 4.10's and a 5.3. I installed heavy ass cooper discoverer AT3 LT275 70 17's. I guess they are like a 32.5 inch tire. The truck ran fine with the stock tires. Once I stepped up to the coopers I could feel a large power loss. I got a Dyno tune and that woke up the truck nicely. It runs comparable to my 06 5.3 ECSB sierra with the 5.3 dyno tune with 3.73's and stock size tires.

 

[Mr. 960]

I have not bothered to rest the AVG economy on my DIC. With the old tires I was averaging about 18 mpg at 75 on the highway with the A/C on.

 

[Marv02]

18 MPG must be nice I getting 14.8 to 15 MPG.

I have not bothered to rest the AVG economy on my DIC. With the old tires I was averaging about 18 mpg at 75 on the highway with the A/C on.

 

[Mr. 960]

18 MPG must be nice I getting 14.8 to 15 MPG.

yup, but that is strictly freeway. In town it drops like the sinking Titanic.

 

[Marv02]

I think I go with 31 or 32 inch tires so it don't kill the MPG and power.

Next is what type of tire I been think getting Continental CrossContact™ LX20 mainly they say they get better MPG due to them being LRR type tire plus the have 70K+ mileage rating.

But on the flip side I like to have a more off road look but it will never see any heavy off road as long I own it will unless I have to LOL.

To tow someone else out that what friends do for each other when the other gets stuck and they call you to rescue them been on both side of this before LOL I still have my 40 foot tow chain just for this.

The cool looking tire or something that will last longer and better MPG and there cheaper.

 

[Burban22]

I just picked up a wrecked '05 burb to use for parts for LS swapping my '84 Jeep Wagoneer. I see RPO GT5 = 4:10 gears. My '03 z71 burb has 3:73 gears. Anyone swap from 3:73 to 4:10? I run the stock tire size 265/70/17 31.6" for now but may go to 32.5 or 33 soon.

We do alot of highway driving and have pulled down great mpg with the 3:73, especially if I drive 65-70. Thoughts on if the swap is worth it? Seems rear is straight forward to swap and the front diff would be the most work.

 

[Marky Dissod]

I just picked up a wrecked '05 burb to use for parts for LS swapping my '84 Jeep Wagoneer.
I see RPO GT5 = 4.10. My '03 z71 burb has 3.73. Anyone swap from 3.73 to 4.10?
I run the stock tire size 265/70R17 31.6" for now but may go to 32.5" or 33" soon.

We do a lot of highway driving and have pulled down great mpg with 3.73, especially if I drive 65-70MpH.
Thoughts on if the swap is worth it? Seems rear is straightforward to swap, front diff would be the most work.

Highway MpG will go down from great to pretty good, possibly good if you drive too assertively.
Stop'n'go MpG will improve, might even make up the difference.

4L60E will last longer with 4.10, unless you abuse it.
You'll need a pcm tune to take full advantage and correct the speedo, which will help the 4L60E last even longer.

 

[Burban22]

Highway MpG will go down from great to pretty good, possibly good if you drive too assertively.
Stop'n'go MpG will improve, might even make up the difference.

4L60E will last longer with 4.10, unless you abuse it.
You'll need a pcm tune to take full advantage and correct the speedo, which will help the 4L60E last even longer.

My 03 burb is blackbear tuned. I would need to send off the computer to get the speedo corrected. Guess I should look for a handheld tuner so they can just send me the file for speedometer corrections. Will see if I end up swapping but I may run 295/70/17 ~ 33" tire all the time instead of just in the winter so should be a wash going to 4:10. I can pull down really good highway mpg with 3:73 and stock tire size 18-20 if I go 65 - 70.

 

[Marky Dissod]

My 03 burb is blackbear tuned. I'd need to send off the computer to get the speedo corrected. Guess I should look for a handheld tuner so they can just send me the file for speedometer corrections.

You wouldn't rather send it to BlackBear, get your money's worth?

Or, if you pick your tire size carefully enough, you won't need any speedo correction for 4.10.
(By the way, 4.10 to 1 is NOT the same as 4 to 10).

 

[strutaeng]

Great thread revival!

Are either one of those differentials G80? Would that matter to you? Are you doing any towing? That's probably what that boils down to.

Compare what towing capacities are with those 2 different ratios according to your owners manual, and see if that's worth it. Again, if you do any towing. We don't know. MPG will likely go down a bit, but wouldn't be huge. Especially if you drive at the same speed. I think it's like a 200-ish RPM difference cruising?

 

[Burban22]

Looks like 1,000 lbs difference between 3:73 and 4:10 gears.

https://www.jnauto.com/pdf/04towingguide.pdf

My burb rarely tows. I have a 3500lb enclosed 16' trailer I tow a few times a year but usually use my newer truck. More get up and go with 4.10 would be great but we put alot of interstate miles on the burb and want the most mpg possible.

 

[Burban22]

Stepping up from stock tire size to my 33.3" BFG k02's would nearly cancel out the 4:10. hmmmm, I'll save the front and rear axle out of the '05 and if I get motivated enough can swap with my 3:73. Bearing the front diff on the totaled '05 burb is still usable. The PO slid off the road into a drainage ditch. Hit so hard the front frame rails are bent upward. No air bags deployed somehow.

Gear Ratio Calculator

Easy to use gear ratio calculator. Use our gear ratio calculator to find the correct gear ratio to run when changing tire sizes to keep your stock gearing.

tiresize.com

 

[Burban22]

Great thread revival!

Are either one of those differentials G80? Would that matter to you? Are you doing any towing? That's probably what that boils down to.

Compare what towing capacities are with those 2 different ratios according to your owners manual, and see if that's worth it. Again, if you do any towing. We don't know. MPG will likely go down a bit, but wouldn't be huge. Especially if you drive at the same speed. I think it's like a 200-ish RPM difference cruising?

lol! Hey, at least I searched! Both are G80.

 

[Burban22]

You wouldn't rather send it to BlackBear, get your money's worth?

Or, if you pick your tire size carefully enough, you won't need any speedo correction for 4.10.
(By the way, 4.10 to 1 is NOT the same as 4 to 10).

I thought they started charging now for any modification to the tune. I was trying to say it would be easier if I had an auto cal they could just send me the file and save me the shipping cost. Hopefully they don’t charge for just a tire size or gearing change

 

[Marky Dissod]

3.73:1 axle ... 265/70R17 tires are 31.60" tall ... 4L60E's 4th gear = 1800RpM @ 65MpH, 2000RpM @ 72MpH, 2200RpM @ 79MpH
4.10:1 axle ... you want tires 34.7" tall to avoid reprogramming the speedometer altogether.

Tires shorter than 34.7" tall will make the speedo read faster than actual with 4.10:1.
Tires taller than 34.7" will make the speedo read SLOWER than actual with 4.10:1.

If your tires go wider than 265mm, your highway MpG will get worse due to more drag area, even with 4.10:1.

 

[S33k3r]

I'll just place this here for your amusement...

Tire Size and Gear Ratio Chart

EDIT: Corrected URL.