hotchocolate
hotchocolate Reader
April 20, 2016 11:06 a.m.

Hello GRM family, How hard is it to remove and replace the transmission above. I have hand tools and a couple of hydraulic jacks and some Jack stands as well as about 3 days to spend on it. I have replaced a transmission in an 85 camry as well as a few other car maintenance projects. Is it something simple. The AWD is what is the unknown. Any insight will be appreciated.

Also I read that this uses the same transmission as the 04-07 Highlander. The Highlander transmission for some reason is cheaper. Are they the exact same or are there some minor differences? Trying to get it done for $1k or less. Thanks in advance guys.

TGMF Reader
April 20, 2016 11:20 a.m.

I've done Lexus RX's. Very similar.

Getting it out will be the hard part. I'm pretty confident engine/trans/subframe assembly drops out the bottom. No room to get it out the top. Getting the body of the car out of the way enough to roll (makeshift dolly) the assembly out from under it will require some creativity.

Aside from that, the front diff/trasnfer unit is simply bolted to the side of the transmission. Its easiest to remove the engine, set it off to the side, then lift the trans off. the transfer unit sits in a recess section of the engine block and tight tolerances make it way harder to get the trans off the engine rather than the engine off the trans. If my memory is correct, I think there is a small O-ring sandwiched in between the cases, as well as a little bit of sealant. Don't forget them or you'll have to do it all again due to a significant trans leak. I would also reccomend replacing both the outer and inner axle seals on the transfer unit while you have it apart. You'll have to remove the bolted on flange to access the axle seal. replace the large O-ring on the flange as well.

hotchocolate
hotchocolate Reader
April 20, 2016 1:35 p.m.

Thank you. This is helpful. If I decide to go ahead with it I know I have you all here for support and pointers.

Second question: I read that the sienna uses the same transmission as the 04-07 Highlander. The Highlander transmission for some reason is cheaper. Are they the exact same or are there some minor differences? Thank you.

TGMF Reader
April 20, 2016 2:23 p.m.

Though these models sharing transmissions makes sense to me, I cannot verify with certainty.

racinjason
racinjason New Reader
April 21, 2016 8:21 a.m.

I am in the same boat. I have a 2006 Sienna that needs a trans. I am researching Highlander transmissions as well, there are a lot more of those out there. If you come across anything, or install a Highlander trans, please post your results. TIA!

hotchocolate
hotchocolate Reader
April 26, 2016 5:00 p.m.
racinjason wrote: I am in the same boat. I have a 2006 Sienna that needs a trans. I am researching Highlander transmissions as well, there are a lot more of those out there. If you come across anything, or install a Highlander trans, please post your results. TIA!

If I am brave enough to do that I will keep you posted.

hotchocolate
hotchocolate Reader
April 26, 2016 5:10 p.m.

Found out that transmission has P0796 code. Shift solenoid needs fixing.

My plan now is to drop the pan and replace the solenoid-- If I can find one. Replace the fluid add lucas and see if it fixes it. If not then weigh my options; replacement or part out.

Anyone know where to buy Shift solenoid valve sl3 (pressure control solenoid "c"? Already called the dealer the parts guy seemed almost as overwhelmed as me.

April 26, 2016 5:22 p.m.

I don't know if the awd is different from the 2wd, but my trans has no "pan". 2004 Sienna

hotchocolate
hotchocolate Reader
April 26, 2016 8:13 p.m.
Fueled by Caffeine wrote: I don't know if the awd is different from the 2wd, but my trans has no "pan". 2004 Sienna

Good to know. I just need to get "in there". I am trusting you all will be my support group.

You'll need to log in to post.

Also on Grassroots Motorsports

Tech Tips: 2015+ Ford Mustang

5 hours ago in Articles

How to make it your way.

Speciality Insurance for Our Special M3?

9 hours ago in Project Cars

Can you save 15% or more with Hagerty?

First Drive: 2017 Subaru BRZ Performance Package

1 day ago in Articles

We’ve heard it before: The Subaru BRZ doesn’t make enough horsepower.

10 Cars to Buy Now

2 days ago in News

Hagerty recently announced the top 10 classic cars to buy in 2017.

Reader's Ride of the Week: Cone-Killing Camaro

2 days ago in News

This one's a work in progress, but we can't wait to see the finished product.

Get Our Magazine in Print and Digital for just $17.99

2 days ago in News

Now is a great time to renew or start subscribing to our magazine.

Treading on Thick Ice

2 days ago in News

How do you improve your car control in the racing off season?

Strap In

6 days ago in Articles

Is your racing harness installed correctly?

2017 Volvo XC90 T6 AWD Inscription

6 days ago in New Car Reviews

Volvo's XC90 is the manufacturer's luxury SUV and this—the T6 Inscription—represents the highest tier of that model. And to triple ...

Flyweight Flier

1 week ago in Articles

The masses may not view the Mazda2 as much of a sports car, but enthusiasts have learned otherwise.

Our Ramp Truck Gets a Vintage Tachometer

1 week ago in Project Cars

Towing with a manual transmission and no tach is a pain.

Vintage Views: Volvo 740 and 760 Turbo

1 week ago in Articles

Boxy but good.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
AixqKrf0CeLYAYcrVavCiVTN8MWuLxZ6