Upgrade to Full Float Rearend- "limp mode?"

It was suggested to post here to hopefully find the answer, since many of you have more experience in this area.

2005 Tacoma 2WD TRD Offroad

PLAN: Replace the stock rearend with a stronger Camburg trussed full floater. Therefore, losing ABS/TONE RINGS/SPEED SENSOR.

PROBLEM: I vaguely remember hearing/reading years ago that if you lose the TONE RINGS/SPEED SENSOR on a 2wd truck then the transmission will not be able to shift correctly and consequently will put the truck in "limp mode", as well as messing up fuel mix ratio.

Also heard that 4wd trucks who upgrade do not have the same issues.

Im just looking for confirmation if these are true or not. Or if someone can point me in the right direction on who to call or message.

 

@jberry813 might know

 

When I installed my rear Diamond axle, I removed any/ all parts related to ABS and never had an issue. My truck is an '03 though.
When it came to the LSPV, I installed a Wilwood unit close to the MC. You can see it in the upper RT corner.



I hope this helps you.

 

Good info for the 2nd gen guys. Like I said, I have an ‘03.
Perhaps the OP can install a 4wd ecu to assist with the cure.
The aftermarket rear axle may not be equipped with the tone rings and other ABS garbage including attachments for the OEM LSPV.

There are threads here which offer ideas to eliminate ABS altogether.

Good luck OP.

 

Sounds like 2nd gen vss setup is dependent more on transmission style rather than being 2wd/4wd.

Appears 2nd gen 6spds pickup the vss from the tcase vs 2nd gen Autos who appear to pick it up at the wheel sensors/tone ring on the axle.

Reference: https://www.tacomaworld.com/threads...-solid-axle-swap.497018/page-38#post-18081373

 

Yep, OP needs to swap in a tcase vss if he doesn’t have one

 

https://www.automaticchoice.com/uploads/producten/pdfs/Catalogue/aw_a750e.pdf

This shows that your 2wd trans has an input and output speed sensor. Now do those replace wheel VSS for trans shifting or are they monitoring internal trans shaft speeds hence an input and output. The VSS at the hubs could just be for ABS on 05s.

Easiest way is if you have access to the truck, disconnect the VSS at the rear hubs and drive it. Then see what the exact error codes are and see how the trans acts.

 

Bumping this.....

currently have the speedo sensors at the wheels and what to use a speedo gear in the tcase (fj case). Any insights on how to go about that?

 

For the 2nd Gen guys going full float in the rear and saying goodbye the WSS call Wyatt at RST, tell him gear ratio and tire size he will get you a worm gear and transfer case speed sensor. It will take some work to make it work and be patient with Wyatt. He does nothing fast.

 

fixed that last part for you

 

Does anyone know where to source your own parts and wiring schematics?

 

@6 gearT444E

 

I have the fj case so I was assuming using the manual t case gear for the speedo. Plan is to throw in a 14 bolt down the road. Planning out all this stuff first.

assuming I’ll loose the abs and traction control stuff as well with the rear sensors gone too.

 

yeah more than likely. unless u can figure out how to use the 14 bolt abs sensors, if it has any, to play with the toyota ABS system

 

I have to dig into the axle still. Was a junkyard find for $80 so still have to see if it’s straight. I’m fine with loosing all that stuff though. Just easier.

 

for doing the VSS swap? Parts can be had at the dealer, I can give you the schematics

 

I think so. Essentially need to speedo to work when I swap out rear axles. Have an auto trans and the fj case.

would be very appreciative of anything as I’m having a hard time sourcing information on this.

 

You will need to acquire the following:

VSS connector 9098011143
VSS O-ring 9671124030
VSS itself 8318112020
Worm gear (if t-case is not equipped with it) 3348135200

1st, if your transfer case does not have the worm gear on the output shaft, you'll need to replace the spacer with the worm gear.




Run 3 wires to new connector V1, one from ignition switched +12V power, and two others which will be signal wires going back to the instrument cluster connector C9 behind the drivers dash area.

Pin 2 from VSS to Pin 3 of instrument cluster
Pin 3 from VSS to Pin 6 of instrument cluster


















It should be noted that once the signal is generated from the combination meter, that signal is then sent to the ECM. Whether from an automatic or from a manual, that signal is the same once it's produced by the combination meter and sent to input to the downstream ECM.

I have also read reports of changing the teeth on the sensor assembly to get the correct speed if you have regeared, I haven't looked much into that but a few other people posted before on here with some P/Ns of different pinion teeth count for the gear speed sensor if that's something that interests you. Additionally, your instrument cluster may or may not have a wire coming out of pin 3 for the signal, you may have to procure additional terminal and wire as such.