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DIY: 2006 IS250 sealed transmission replacement

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Old 04-17-11, 02:34 PM   #1
whazzzzuup
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Default DIY: 2006 IS250 sealed transmission replacement

Hey guys. Here are some pictures for you members that may need to replace their IS250 RWD transmission. My friend and I completed this in our garage. We spent time on it after we got off of work. I think it took a total of 20 hrs combined. We got a transmission off car-part-com for $850 shipped. Shifts so smoothly!

Keep in mind: we are both in the health care field; not mechanics. So if we can do it, you can too!

The car was jacked up and supported with 4 jack stands. The front jack stands were positioned higher than the rear stands. 2 wheels were put under the front wheels for safety as well. The front was up about 21 inches and the rear about 15 inches:
Click the image to open in full size.

Here is the side views of the "new" transmission:
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Before you can take out the starter, you must remove the driver's-side header:
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The starter has two 12mm bolts holding the nuts in. Remove those, remove the 2 14mm bolts that hold the starter in, and the starter will be free:
Click the image to open in full size.

Remove the steering shaft (by driver-side header):
Click the image to open in full size.

Before you remove the passenger-side header, you must remove the intake, oil dipstick, wiring harness to the front two coil packs, and vacuum hoses by the shock tower.
Click the image to open in full size.

Disconnect the headers from the y-pipe and remove the passenger-side header as well. Make sure you unplug the primary o2 sensors:
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Disconnect the hoses from the heat exchanger:
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Another view:
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View of passenger-side header:
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Remove transmission bolts. There is 11 bolts total; 2 to the starter:
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From left to right (12 o'clock going clockwise):
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Undo the bolts that connect the flywheel to the torque-converter. There are six 14mm 11-grade bolts. They are held on really tight. Make sure you hold the crankshaft in place when you remove these or the entire flywheel/torque converter assembly will move.
Click the image to open in full size.

The new torque converter with the 6 14mm bolts attached (so I don't lose them):
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Bell-housing:
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Torque-converter:
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Remove y-pipe, along 2 secondary o2 sensors. I used a 24mm socket with a slit down the middle of the socket:
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Here is the half-shaft (removed):
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Half-shaft (transmission-side/attached). It just pulls out smoothly after the bolts that secure the half-shaft are removed:
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Transmission/half-shaft spindle:
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Half-shaft (four 14mm bolts and nuts):
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Remove transmission mount/bracket:
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Some of the parts removed:
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Old 04-17-11, 02:35 PM   #2
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Remove shifter link and attach to new transmission:
Click the image to open in full size.

Old transmission coming out:
Click the image to open in full size.

Transmission out:
Click the image to open in full size.

New transmission with half-shaft attached:
Click the image to open in full size.

Flywheel (where the torque converter attaches):
Click the image to open in full size.

When the new transmission lines up this pin will help with the process. You can adjust the torque converter to line up with the flywheel by sticking a hand into the starter hole, reaching back there and moving it.

Reinstall in reverse. Good luck! Thanks for looking.

P.S: These pictures should also help a member that may wanna just install headers or an exhaust.
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Old 04-17-11, 02:39 PM   #3
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nice, but looks like tons of work..but why would u replace your transmission? something wrong with it?
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Old 04-17-11, 02:39 PM   #4
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wow! great DIY!
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Old 04-17-11, 02:52 PM   #5
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Quote:
Originally Posted by chris07is View Post
nice, but looks like tons of work..but why would u replace your transmission? something wrong with it?
I forgot to mention in the first post. The transmission was slipping in first and second gear. I think it was due to driving the car with summer tires in the snow.
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Old 04-17-11, 06:06 PM   #6
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You guys must be surgeons...
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Old 04-17-11, 06:20 PM   #7
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New field, car surgeons!
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Old 04-17-11, 06:25 PM   #8
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Quote:
Originally Posted by chikoo View Post
You guys must be surgeons...
I was thinking the same thing!

Looks like *a lot* of work.. congrats for doing it yourself! I hope I never have to do this.
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Old 04-17-11, 06:29 PM   #9
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did you check to see if the tranny was still under warranty? i thought they had a 100,000 mile warranty on drivetrain?
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Old 04-17-11, 06:29 PM   #10
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that's super impressive.
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Old 04-17-11, 06:40 PM   #11
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While I've changed a few trannies, I find the most impressive part to be the picture taking. It would take so much longer if you were always stopping to take pictures, haha.

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Old 04-17-11, 08:02 PM   #12
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I agree with Jeff - great work, thanks for posting the DIY and pics!

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Old 04-17-11, 08:07 PM   #13
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why the change??? thats my biggest question. new owner here.
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Old 04-17-11, 08:14 PM   #14
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I'm going to save this as my favorites
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Old 04-17-11, 11:06 PM   #15
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Quote:
Originally Posted by Nikon View Post
why the change??? thats my biggest question. new owner here.
The basic drive train warranty is 6 year/70k miles.

Nikon, please look at post #5.

Thanks for all the comments, guys! If you guys have anymore questions, I would be happy to answer them!
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2006, 250, converter, diy, gearbox, is250, lexus, replaced, replacement, sealed, slipping, starter, torque, tranny, transmission

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