New Gears For Titan??

[ptgarcia]

I think they should consider 3.73's and 4.10's and drop the 4.88's. The 3.73's will sell lot hot-cakes for the many trucks running the 6" lift and 35" tire that rarely, if ever, leave the pavement. The 4.10's would be better suited for the serious off-roader, whether racing or semi-rock crawling. On the street 4.10's are going to turn some pretty high rpm. 4.88's will be too low for anything but a dedicated off-road rig.

I know I don't have my Titan anymore, but if I did I'd want a set of 3.73's.

[Toomnymods]

you went to the dark side!!

[bwalkertitan]

I'd defninitely be interested in a set.

[jason27]

Depending on the price some 3.73's sound good to bring my ratio back to stock after putting the 35's on

[TitanicDJ]

Alright, I gotta ask the question.

I don't fully understand the gear set change and what's best?

I have the OR, BT packages and lifted with, not exactly 35's but 34 3/4 (BFG 315). I do go off road and I'm now towing a 7500 lb travel trailer occasionally. What is the ratio I would be looking at? I don't understand between the stock 3.36 BT to the 4:10, 4:88, 3:53 to the 3.73....? These are just numbers to me and I'm not clear on lower or higher is the better choice but want to learn. On the RV site you see Dodge and Chevy's with gear sets at 3.42 or 3.73 to 4.10. Is it better to go lower or higher with the ratio and how do you figure by how much?

I bet there are a couple members here on this forum that don't understand these new gears but would like to learn so I'll ask and take the heat for a newbie question...LOL

DJ

[QWIKWHIP]

Originally Posted by TitanicDJ

Alright, I gotta ask the question.

I don't fully understand the gear set change and what's best?

I have the OR, BT packages and lifted with, not exactly 35's but 34 3/4 (BFG 315). I do go off road and I'm now towing a 7500 lb travel trailer occasionally. What is the ratio I would be looking at? I don't understand between the stock 3.36 BT to the 4:10, 4:88, 3:53 to the 3.73....? These are just numbers to me and I'm not clear on lower or higher is the better choice but want to learn. On the RV site you see Dodge and Chevy's with gear sets at 3.42 or 3.73 to 4.10. Is it better to go lower or higher with the ratio and how do you figure by how much?

I bet there are a couple members here on this forum that don't understand these new gears but would like to learn so I'll ask and take the heat for a newbie question...LOL

DJ

I'll try and give a basic explanation, but I'm sure someone can explain it better. Because the Titan has a unique 5 speed tranny, the ratio's work out a little differently than most domestics. The 3.36 big tow/off road gears you have would be equal to a 4.10 in a domestic. When you add bigger tires, the end ratio changes, it gives you a lower number, but is actually a higher ratio. The higher the number, the lower the ratio. So if you have a 3.36 with 35" tires, you would need approximatly a 3.53 to get you truck back to the stock performance. Hopefully someone will explain it better for ya.

[ptgarcia]

Originally Posted by TitanicDJ

Alright, I gotta ask the question.

I don't fully understand the gear set change and what's best?

I have the OR, BT packages and lifted with, not exactly 35's but 34 3/4 (BFG 315). I do go off road and I'm now towing a 7500 lb travel trailer occasionally. What is the ratio I would be looking at? I don't understand between the stock 3.36 BT to the 4:10, 4:88, 3:53 to the 3.73....? These are just numbers to me and I'm not clear on lower or higher is the better choice but want to learn. On the RV site you see Dodge and Chevy's with gear sets at 3.42 or 3.73 to 4.10. Is it better to go lower or higher with the ratio and how do you figure by how much?

I bet there are a couple members here on this forum that don't understand these new gears but would like to learn so I'll ask and take the heat for a newbie question...LOL

DJ

The higher the gear ratio numerically, the lower the gearing physically. So 3.73's are a lower gear than a 3.36.

What the ratio means is it take 3.73 turn of the driveshaft to turn the axles (wheels) one revolution. So lower gears (higher numerically) will require the engine to run at higher rpm to maintain the same speed as a higher gear (numerically lower).

Why change gears? Well, when you mount a set of taller tires you effectively raise your gear ratio. This means the engine runs a lower rpm to maintain the same speed, pulling the engine out of its sweet spot where its designed to run. Swapping gears to a lower set kind of cancels the effects of the taller tires, making the truck feel close to stock again.

When it comes to gear changes I also go to a set a tad lower than that required to bring you back to stock to help make up for the added weight and rolling resistance of the larger tire.

Hope this helps.

[TitanicDJ]

Originally Posted by ptgarcia

The higher the gear ratio numerically, the lower the gearing physically. So 3.73's are a lower gear than a 3.36.

What the ratio means is it take 3.73 turn of the driveshaft to turn the axles (wheels) one revolution. So lower gears (higher numerically) will require the engine to run at higher rpm to maintain the same speed as a higher gear (numerically lower).

Why change gears? Well, when you mount a set of taller tires you effectively raise your gear ratio. This means the engine runs a lower rpm to maintain the same speed, pulling the engine out of its sweet spot where its designed to run. Swapping gears to a lower set kind of cancels the effects of the taller tires, making the truck feel close to stock again.

When it comes to gear changes I also go to a set a tad lower than that required to bring you back to stock to help make up for the added weight and rolling resistance of the larger tire.

Hope this helps.

Thanks QWIKWHIP and ptgarcia,

This does help a lot. I never reply to these types of post on the RV site because it seems a lot of them would suggest trade the Titan for a 3/4 ton. So when you say go to a lower ratio to return to stock what set would that be the 4.88 Greg mentioned? Since we have 3.36 (BT) which is like a 4.10 in domestics is this too high or is the 4.10 with the larger tires going to get closer to stock?

Again sorry for the questions, this is helping me better understand what to look for when the gears are ready.

[DaFridge]

Originally Posted by QWIKWHIP

lol, For some reason I knew you would want the 4.88's.

heck yeah! for 4.88's, i'll ride my mtn bike to work if i have to.

[QWIKWHIP]

New tire size/stock tire size X stock ratio = new ratio

But like PT said, it's not a bad idea to go with a little lower ratio (higher numeric) to help with the extra weight.

That being said, I would say the ideal ratio for a lifted Titan w/35's that wants to return to stock performance would be the 3.73 gears.

[ptgarcia]

Originally Posted by TitanicDJ

Thanks QWIKWHIP and ptgarcia,

This does help a lot. I never reply to these types of post on the RV site because it seems a lot of them would suggest trade the Titan for a 3/4 ton. So when you say go to a lower ratio to return to stock what set would that be the 4.88 Greg mentioned? Since we have 3.36 (BT) which is like a 4.10 in domestics is this too high or is the 4.10 with the larger tires going to get closer to stock?

Again sorry for the questions, this is helping me better understand what to look for when the gears are ready.

Stock gears are 3.36:1 and stock tire size is roughly 33". If you went to a 35" tire, you effectively lowered your gear ratio by (1-33"/35") x 100%=5.7%. To return to stock you need to lower the ratio by the same percentage: 3.36 x 1.057=3.55. So a 3.55:1 ratio gets you to stock. I like to go a bit lower, that's why I recommend 3.73's.

4.88's are way to low for a street rig.

[TitanicDJ]

Originally Posted by ptgarcia

Stock gears are 3.36:1 and stock tire size is roughly 33". If you went to a 35" tire, you effectively lowered your gear ratio by (1-33"/35") x 100%=5.7%. To return to stock you need to lower the ratio by the same percentage: 3.36 x 1.057=3.55. So a 3.55:1 ratio gets you to stock. I like to go a bit lower, that's why I recommend 3.73's.

4.88's are way to low for a street rig.

Thanks again, now I understand better why a lot are mentioning the 3.73 gears....Hey Greg....3.73???

[red_rider_elsinore]

I'd want a set too. I think the truck is undergeared (3.357) for the stock 33". Our trucks are geared to do 200+mph at redline in 5th. With 4.88 our trucks would cruise around at 2800mph at 70mph. At 70mph most of our engine's work is going into fighting to the wind. I doubt it if I see a minor if any drop in mpg. That's just my opinion though

[PrerunnerGreg]

This is exactly the kind of feedback that is needed. I aggree about the 3.73 and 4.10 bing the ratios to start with. My 4.10 with 37's is jsut about perfect, so 3.73 on 35's would be great. And the gears really, really wake-up the acceleration. I will post more as this develops.

[Aquaholic]

I would want 3.73