Attention Toyota auto technicians

[v8Toilet]

What would it take to put the 4-runner five speed transmission into a 2001 Tundra and other than a junk yard were can I get the parts.

[Agent WD-40]

I would be interested in hearing if this is possible. I think the electronic end might be the more difficult part of this equation. I'm not sure how all the computers are set up though and how compatable all that is. But that is my guess.

[mustang67408]

Physically the transmission would fit. But if i am not mistaken the computer logic to run the transmissionn from the 2003 is not compatible with the computer from the 2001. You would have to swap out the entire wiring, computer, and some of the other electronic computers.
I think this is so, because the 2002 TRD supercharger and TRD computer is not compatible with the new 2003 tundra. TRD is working on it, and their reason it wont work is beacuse the 2003 computer uses 32 bit logic where the 2000-2002's use only 16 bit.

[v8Toilet]

So basically I would need the entire computer setup alone with the 4-runner transmission and rear axle ratio to make it work. I guess that would be kind of expensive!

[thecarguy]

I belive the v6 tacoma uses the same 4 speed auto tranny as the sequoia and tundra. If so why not use a 5 speed from a v6 taco for the same model year as your tundra?

[mustang67408]

So basically I would need the entire computer setup alone with the 4-runner transmission and rear axle ratio to make it work. I guess that would be kind of expensive!

You are correct very expensive, it all has to do with the 2003 computer logic, it is different starting this year.
Also they do not affer a 5 speed auto in the Tacoma V-6.

[v8Toilet]

I was playing around with the different transmissions on my drag program and also comparing Motor trend testing on the Tundra and new 4-Runner. It seems the only real benefit/difference is the greater gear reduction in first and second gear. The EPA gas mileage figures are also a little better at 15-18 for a 4*4 model, which is the same for my 2WD Tundra. Passing power on paper from 45 mph and up looks like it would be in favor of the four speed transmission with the 3.91 axle ratio compared to the five speed with the 3.73 gears. Off the line power would be in favor of the five speed though.

It’s probably not worth the effort!

[charlie]

Hi,is the 5th gear taller than the current 4th gear?I guess I am really curious if the 5th gear-differential combo is actually "taller" than the 4th-differential combo?What will it turn at 60 mph.The current Tundra does about 1900 RPMS.Thanks,Charlie PS I think the stock wheels-tires on the 4 Runner are the same 265/70x16 as out Tundra

[v8Toilet]

Four speed transmission ratios:
1st: 2.8 2nd: 1.53 3rd: 1 4th: 0.7

Tire Diameter 1: 30.6 inches
Rear Gear Ratio 1: 3.73:1
MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 8 15 23 33 0 0
1500 13 23 35 50 0 0
2000 17 31 47 67 0 0
2500 21 38 59 84 0 0
3000 25 46 70 100 0 0
3500 29 54 82 117 0 0
4000 33 61 94 134 0 0
4500 38 69 105 151 0 0
5000 42 77 117 167 0 0
5500 46 84 129 184 0 0
6000 50 92 141 201 0 0
6500 54 100 152 218 0 0
7000 59 107 164 234 0 0
7500 63 115 176 251 0 0
8000 67 123 187 268 0 0

Five speed transmission ratios:
1st: 3.52 2nd: 2.04 3rd: 1.4 4th: 1 5th: .72

Tire Diameter 1: 30.6 inches
Rear Gear Ratio 1: 3.91:1
MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 6 11 16 22 31 0
1500 10 16 24 34 47 0
2000 13 22 32 45 62 0
2500 16 27 40 56 78 0
3000 19 33 48 67 93 0
3500 22 38 56 78 109 0
4000 25 44 64 89 124 0
4500 29 49 72 101 140 0
5000 32 55 80 112 155 0
5500 35 60 88 123 171 0
6000 38 66 96 134 186 0
6500 41 71 104 145 202 0
7000 44 77 112 156 217 0
7500 48 82 120 168 233 0
8000 51 88 128 179 248 0

Using my drag program I get 0-60 in 8 seconds and the quarter mile coming in 16 seconds @ 85.3 mph with the four speed.

I get 0-60 in 7.4 seconds and the quarter mile coming in 15.63 seconds @ 86.7 mph with the five speed. This transmission would be better for towing and utilizing the torque of the 4.7-liter engine better!