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Discussion Starter · #1 · (Edited)
There seems to be a lot of misinformation floating around online regarding the differential gear ratios in first gen Tundras. The information is all laid out in the sales brochures, most of which can still be found online. Towing packages have no effect on gear ratios, they only add things like trans coolers and a 7 pin wiring harness. The axle code printed on the vin plate on the door won't tell you what you need to know. The dealer can determine the gear ratio from the vin, but you don't really need to go through that effort.

2000-2003
3.91 - V8, 4x4, auto trans
3.92 - V8, 4x2, auto trans
4.08 - V6, 4x2, auto trans or manual trans
4.10 - V6, 4x4, manual trans
4.30 - V6, 4x4, auto trans

2004, Regular Cab or Access Cab
3.91 - V8, 4x4, auto trans
3.92 - V8, 4x2, auto trans
4.08 - V6, 4x2, auto trans or manual trans
4.10 - V6, 4x4, manual trans
4.30 - V6, 4x4, auto trans

2004, Double Cab
4.08 - V8, 4x2, auto trans
4.10 - V8, 4x4, auto trans

2005-2006
3.77 - V6, 4x2, auto trans
3.91 - V8, 4x4, auto trans
3.92 - V8, 4x2, auto trans
4.08 - V6, 4x2, manual trans
 

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Also in 2004 the double cab 4x4 had 4:10 gearing with v8. But in 05-06 they changed again with vvti coming out. So yeah I would confirm with other means.
 

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Discussion Starter · #3 ·
Also in 2004 the double cab 4x4 had 4:10 gearing with v8. But in 05-06 they changed again with vvti coming out. So yeah I would confirm with other means.
Thanks for the correction. That info was in the 2004 sales brochure, I just missed it.

The only exception to the ratios I put up was the 2004 Double Cab, which had 4.10 gears as a 4x4 and 4.08 gears as a 4x2. I edited the original post to show the updated info.
 

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I have a 2000 4x4 ex cab v8 truck and just now having rear differential trouble pin broke and everything went to hell from there and where can a guy find a ring and pinion set 391 ratio because I looked for three weeks and finally bought a parts truck for a thousand bucks and it had a good set
 

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Discussion Starter · #5 ·
I have a 2000 4x4 ex cab v8 truck and just now having rear differential trouble pin broke and everything went to hell from there and where can a guy find a ring and pinion set 391 ratio because I looked for three weeks and finally bought a parts truck for a thousand bucks and it had a good set
Yukon Gear makes aftermarket ring and pinion sets for the Toyota 8.4" rear diff. They have a 3.90 ratio available. It's probably the same number of teeth on the gears, but with the ratio number rounded off differently. Even if that's not the case 3.90 and 3.91 are close enough they they can work together front and rear.

https://www.yukongear.com/productdetails.aspx?ProdID=16806

There are a lot of places selling these online, typically around $236.
 

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I appreciate the information I’m very pleased with my decision to buy a complete extra truck because of parts available In my area are mostly mail order or 100 mile drive i have a heavy truck shop and regularly build differential transmission gears for over the road and I could rebuild a front power decider differential new gears and Bering for less money than Toyota asked me for a ring and pinion set the money that they make on parts is astonishing and I remain Eaton truck differentials with Eaton parts for less money than the Toyota set that’s just greedy
 

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I got spider gears and Bering kit. From Yukon thru Rock auto and there stuff is good quality parts and at decent prices but Toyota is so high the aftermarket venders even have room to price gouge
 

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I bought my 4.56 from you guys in 2011, great experience.

I never heard some of these ratios, I'm a bit confused why they would bother with some of them. 4.08 or 3.92, too close to other ratios.
 

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Discussion Starter · #10 ·
The one that seems odd to me is the gearing for the V6 models in 2005-2006. For 2000-2004 all of the V6 models had lower gearing, which makes sense to make up for the less powerful engine. And there was lower gearing for the Double Cab when it was introduced in 2004; more weight so lower gearing to make up for that. But in 2005 the engines, V6 and V8, all got more powerful and the transmissions gained a gear (auto went from 4 speed to 5 speed and manual went from 5 speed to 6 speed. But the gearing stayed the same for the V8 models (except the Double Cab, which came in line with Access Cab and Regular Cab V8's) and the V6 manual kept the same low gearing, but the V6 auto went to a much taller gear, from 4.08 to 3.77 - I wonder why?
 
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