Differential Specs and available parts! - LC200 not being left out.

[Letsgomoreplaces]

Just a heads up. Aftermarket parts availability is expanding. With the popularity and demand for 07+ Tundra gears, We have not left out the 200 series in our product range. We will have Nitro Gear 4.88 Ring & pinions in stock in August! This is great news as the 6 speed trans has a very tall overdrive and 6th gear becomes useless when larger tires are fitted. We also offer King Shocks, ARB Air Lockers, Auburn rear LSD, etc etc.

Here is the technical info and p/n's:

Justdifferentials is the first to offer gears for 2007+ Tundra & Landcruiser 200 series!

9" Reverse Front Clamshell Diff specs: Aluminum case (thick casting), 34 spline axles, double ball bearing outer pinion bearing (unique design) much stronger than Landcruiser 80 or 100 series front diff.

[FONT=&quot]T9R-488R-NG[/FONT] 4.88 RING & PINION FOR TOYOTA 9” CLAMSHELL FRONT
- 2007+ TUNDRA ALL
- 2008+ LANDCRUISER 200 SERIES, ALL
-USE W/ MK T9R-IFS MASTER KIT OR IK T9R-IFSMINIKIT
Locker options: ARB Air Locker



Rear 9.5" Diff Specs: Similar to older models (100 series), 32 spline axles, threaded ring gear, strong design,

[FONT=&quot]TLC100-488-NG[/FONT] 4.88 RING & PINION FOR LATE TOYOTA 9.5” REAR


-2007+ TUNDRA W/ 4.6L & 4.7L V8 ONLY (REQ. FLANGE)
-1998+ LANDCRUISER 100, 78, 79, 200 SERIES (02+ REQ. FLANGE)
-USE W/ MK TLC-B MASTER KIT OR IK TLC MINIKIT
Locker options: ARB Air Locker, Auburn Pro LSD

 

[Tapage]

Carl did you have any pic to share of front 3rd 200 series ? double bearing detail .?

 

[JBHorne]

What are the stock gears?

Stock tire size is 31.5". My tires are 33.2".

What gear ratio would you recommend?

 

[bjowett]

Front 200 series Diff.

Gears are 3.90.

 

[JBHorne]

Off topic, but so why again is a front diff drop not possible?

 

[ballsbygm]

Off topic, but so why again is a front diff drop not possible?

Anything is possible!

Currently though there's only about 1/2" from the drive shaft uni to the front cross member. I thought about an 8" or so extention (1-2"dia) this would allow a drop of 1 and a 1/2". Not sure if the added load and uni that far out would be an issue???

Have not gone the path yet but keen to know of any other issues with it.

 

[matt60/80]

Because the cross member the front diff is over is not removable like it is in the 100.

 

[JBHorne]

Because the cross member the front diff is over is not removable like it is in the 100.

Plasma cutter time?

 

[matt60/80]

So long as you're the guinea pig.

 

[Letsgomoreplaces]

Front double bearing

In the bottom of this photo. Also in the pic is one of 2 T9R-488R-NG, (BJOWETT HAS THE OTHER) These went in my supercharged tundra.

Carl did you have any pic to share of front 3rd 200 series ? double bearing detail .?

 

[Letsgomoreplaces]

Gears

Stock are 3.9

My Tundra has same motor and supercharged, running worn out 35's measuring under 34". I run 2000 rpm at 70mph which is sweet. The 6 speed has OD in 5th and 6th, so 4.88 may sound low, but your rpms are reasonable, and 6th becomes more useful. I picked up a solid 2 mpg (20% haha) But I have a 3k ft climb in 9 miles on my commute.

We will only have 1 choice 4.88.

What are the stock gears?

Stock tire size is 31.5". My tires are 33.2".

What gear ratio would you recommend?

 

[JBHorne]

Stock are 3.9

My Tundra has same motor and supercharged, running worn out 35's measuring under 34". I run 2000 rpm at 70mph which is sweet. The 6 speed has OD in 5th and 6th, so 4.88 may sound low, but your rpms are reasonable, and 6th becomes more useful. I picked up a solid 2 mpg (20% haha) But I have a 3k ft climb in 9 miles on my commute.

We will only have 1 choice 4.88.

I'm not a gearhead, but you are saying that a higher gear ratio increases fuel economy and allows the 6th gear to be more useful? At 80mph my truck bounces between 5th and 6th constantly. I either drive at 75 to hold 6th or 85 to keep it in 5th (or manumatic mode and force 5th). Having a smoother 6th would help. My recollection however is that lower gear ratios (higher number) actually hurt mpg on the highway.

However, what will 4.88's do for acceleration? Top speed? Any way to calculate the difference/improvement?

If my memory serves me correctly, I believe a lower ratio number (taller gear) improves top speed while a higher ratio number (shorter gear) improves acceleration. Correct?

What is involved with changing gears? I have an ARB rear locker and stock in the front (not sure if it's an LSD or open???). I've been considering adding an ARB to the front as well.

I'm assuming that both the front and rear have identical ratios and both would need to be done simultaneously?

Sorry for all the questions, but thank you in advance

 

[Letsgomoreplaces]

gearing

As I said before the 5th and 6h gear are overdrive, which reduces RPM's singificantly. With stock tires, they barely stay in 6th gear unless on flat highway. this is in an attempt to keep RPM's low and consume less fuel. Now when larger tires are fitted it further reduces RPM's to the point that you are below optimal power range and cant hold 6th gear. So yes you loose less fuel with less rpm's so long as you do not go too low. And yes of course installing lower gears helps on the low end with acceleration.

For example, if you were on your 10 speed, it uses less energy to pedal slower, like in 10th gear on flat ground. Now if you try to go up a hill 10th gear does not do so good. If 10th gear is so tall that you can never use it, than it is not very economical.

As I said my tundra (same motor, trans, similar weight tire height) Runs a smooth 2000 rpm at 70 mph, stays in 6th and picked up a couple MPG.

Yes both have to match and would be done at same time.

Feel free to call or email. too.

I'm not a gearhead, but you are saying that a higher gear ratio increases fuel economy and allows the 6th gear to be more useful? At 80mph my truck bounces between 5th and 6th constantly. I either drive at 75 to hold 6th or 85 to keep it in 5th (or manumatic mode and force 5th). Having a smoother 6th would help. My recollection however is that lower gear ratios (higher number) actually hurt mpg on the highway.

However, what will 4.88's do for acceleration? Top speed? Any way to calculate the difference/improvement?

If my memory serves me correctly, I believe a lower ratio number (taller gear) improves top speed while a higher ratio number (shorter gear) improves acceleration. Correct?

What is involved with changing gears? I have an ARB rear locker and stock in the front (not sure if it's an LSD or open???). I've been considering adding an ARB to the front as well.

I'm assuming that both the front and rear have identical ratios and both would need to be done simultaneously?

Sorry for all the questions, but thank you in advance