Vinman02
Calgary, Alberta
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Joined: 07/14/2007
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mkirsch wrote:
Toyota goes the other way with the new Tundras. IIRC they've got a 4.31 rear axle ratio, and double-overdrive in the 6 speed transmission.
You are correct. The 2007 and up Tundra's also has a 10.5" ring gear if you have the 5.7 engine.
Vince
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loufish
Burbank, CA
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Joined: 11/06/2003
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Quote:Toyota goes the other way with the new Tundras. IIRC they've got a 4.31 rear axle ratio, and double-overdrive in the 6 speed transmission.
As does Dodge with their 5 speed trans for the Hemi...
My Titan has a 3.357 rear gear, not the usual gear ratio for a truck rated to tow 9500 lbs, but you don't have to try towing in 5th, or even 4th gear if required. When I'm in 4th gear(direct) all I've got is the rear's 3.357 which is kind of tall, but running in 3rd up grades(or down them)adds a 1.51 ratio that gives me a combined ratio equal to a 5:00 rear end ratio in most other trucks direct gear, AND I have 2 more gears to drop down to if needed.
More gears, more choices...I love having a 5 spd over a 4, and miss the extra gear when driving/towing with a 4 speed.
"I won't camp next to you, if you don't camp next to me!"
2004 Titan King Cab, 2wd, 5.6L V-8, 5 Speed Auto Trans, Tow Package.
2004 Jayco Qwest Baja P/U
2002 Honda XR650R
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rsh_757
Auburn, WA
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Joined: 04/05/2006
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mkirsch wrote:
The gears in a 3.31 axle are actually STRONGER than a 3.73, because the teeth are larger and deeper. A 4.88 ratio has very shallow, small teeth compared to a 3.08. It's all a matter of degrees.
It does? You must be under the assumption that the differential is the exact same size. I don't know, maybe it is with that Ford, but normally, the heavier the truck, the bigger the pumpkin to go with it and that means the bigger the ring gear.
Besides, the axle will fail before that ring gear does!
2008 Cougar 310SRX 5th Wheel
2005 Dodge Ram 2500 QC 4x4 CTD
2008 Nissan Armada LE
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rsh_757
Auburn, WA
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Joined: 04/05/2006
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Vinman02 wrote:mkirsch wrote:
Toyota goes the other way with the new Tundras. IIRC they've got a 4.31 rear axle ratio, and double-overdrive in the 6 speed transmission.
You are correct. The 2007 and up Tundra's also has a 10.5" ring gear if you have the 5.7 engine.
Vince
This is not "also", this is BECAUSE. 
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