2006 GX470 transmission issues (1 Viewer)

[Beej]

Now I'm throwing the same code, pulled via ScanGauge... pretty confident this is the same issue!

 

[Beej]

TransGo - Toyota A750 SHIFT KIT® Valve Body Repair Kit with tools

This A750 SHIFT KIT® Valve Body Repair Kit fits 2003 and newer Toyota and Lexus vehicles equipped with the A750, A760, A761, A960 and AB60 series

transgo.com

This looks right

 

[Rednexus]

FYI, my transmission did end up with a P2759 code. I replaced the harness inside the transmission (~$60 part) and fixed up some of my aftermarket lockup switch wiring and it went away. The trans also had some intermittent weird gear and shift behavior that dissapeared.

So I would recommend also replacing the harness if one of these is having any other trans issues.

 

[Beej]

@Rednexus You got P2759 after you rebuilt your valve body or the harness was causing similar/same issue?

You dont happen to have a part # for that harness, do ya?

 

[Rednexus]

Yes, almost 2 years later.

8212560651 is the number.

 

[Beej]

Yes, almost 2 years later.

8212560651 is the number.

Thanks for the info! I appreciate it. Forum has been great for this kinda funny issue. I just got the truck and luckily CEL remains off for this so it should still pass emissions and i can get the title transfered.

Now, is this a 'while youre in there' item or, when you say inside the transmission do you mean inside the transmission?

I'm hoping I can take care of this with the tranny in the truck because otherwise the missus is gonna raise an eyebrow - and she'll raise both when she sees the bill. 2 years doesnt sound too bad.

 

[Rednexus]

It's a while you are in there thing. If you are already pulling the valve body it adds maybe 30 minutes to the job.

 

[Beej]

Ok, I did it.

I'm still waiting for ambient temps to cool down to check the fluid levels; then I'll do the test drive. But anyway, these are the videos that helped me disassemble and reassemble the A750f in my '06 GX470:

Both videos are from an account called IPT Performance Trans - they seem to know what they're doing. Really good tips and explanations in the video.

These links from Tacoma World were also useful. Please note that instructions may different slightly for different vehicles:

• Transmission- 5 Speed automatic write up with pics for second gen 4 liter trucks - https://www.tacomaworld.com/threads/transmission-5-speed-automatic-write-up-with-pics-for-second-gen-4-liter-trucks.289913/
• How to: drop, clean, and reinstall the 2nd Gen transmission pan and filter - https://www.tacomaworld.com/threads/how-to-drop-clean-and-reinstall-the-2nd-gen-transmission-pan-and-filter.726329/

And finally, for the drain and refill parts:

• High Mileage GX470 Restoration | Ep.4 | Transmission Fluid Flush & Filter Change - https://www.youtube.com/watch?v=qsyLTRGwiY4&list=PL1NE_MkjB9D_pxQpJL9_SE-VcDxXI2_MZ&index=4
• I used this pump - https://www.harborfreight.com/multi-use-transfer-pump-63144.html?event_id=183117

I changed the:

• Accumulator piston - TransGo - Specialty Components | Toyota Accumulator Piston - https://transgo.com/product-details/toyota-accumulator-piston/
• TCC valve - TransGo - Toyota A750 SHIFT KIT® Valve Body Repair Kit with tools - https://transgo.com/product-details/toyota-a750-shift-kit/
• Boost valve - TransGo - A750-BOOST - A750 Pressure Regulator Boost Valve Kit - https://transgo.com/product-details/a750-boost-valve/

If I were to do this again, I might consider the end plug kit and/or the Sonnax Zip Kit which is from a different company; Transgo and Sonnax seem to be the main players.

I also replaced the wiring harness while I was in there.

I had never worked on transmission before. Transgo customer service told me not to. Several write ups told me not to. That sealed the deal - I had to.

I will report back about how it turned out for me - I have an appointment with a mechanic in a few weeks to reset the computer, which I believe is required to realize the benefits of the fix.

Good luck to you!

-- Beej

 

[Beej]

It didn't work. Had a mechanic do a reset and... no improvement. Now looking for a used A750f.

 

[Timujin]

Any update?