I have a 98 Tacoma 4x4 With 3.4 with tow package which includes a heavier or longer engaging fan clutch, and of course the tow receiver.
Recently my clutch went out, My now new friend and shop owner replaced mater cylinder and slave and Oreillys clutch kit. Soon after we hear what sounds to be throw out bearing chirp at idle and also can be heard at low speed and rpms. He said let's have Oreillys warranty the whole kit, and pay for his laybor for faulty equipment. That's still an option. So Oreillys base line parts are not the best quality and upon research with their salesman their are three different throwout bearings and they do not know if if one of them is same as in kit. Another thing at the same shop I've tested and looked at two other Yotas. A 96 4cyl and a 2000 v6 neither have any of the tow upgrades mine has. Also those two had a narrow clutch pedal assembly with a small spring attached to cross bar in dash. Mine has a wider clutch pedal with a heavy spring in the shape of a w and at the top a sensor and adjustment, and at bottom sensor for key ignition and threaded adjustment. I adjusted bottom first until chirp stopped but that pushed rod further into master cylinder thus it was slow to return and clutch disengaged quickly. Top adjustment I had same results with adjustment all the way out still chirp and even after adding 10mm bolt through hole in front of adjustment. Could I have the clutch for a non towing Tacoma and bearing is making noise because my pedal adjustments are wrong or is my master cylinder rod wrong for tow package Tacoma and or my pedal assembly? I mean if I just slightly push the pedal the chirp goes away!

 

I'm going out on a limb a little bit here, but I don't think there really was a tow package for 98 Tacoma. Sure, some dealership or previous owner may have made a couple modifications, but there is no towing clutch or clutch pedal.

I tow a 3,000lb camper trailer regularly in the summer. The upgrades my truck needed all had to do with the rear suspension. Of course I added a brake controller and hitch. But the real downfall of these trucks for towing is the soft rear springs. I had to put new HD leaf springs and air bags in my truck.

My truck has 290,000 miles, original OEM clutch.

It's been too long since I've done a clutch job to help you trouble shoot, but I think you're getting hung up on the wrong thing if you're getting stuck on this "tow package" stuff. You've got a 98 Tacoma. Everything should be standard.

 

The one thing that typically comes with a "tow package", at least way back in the 90s, would be a transmission cooler for an auto tranny. For a 5 speed, there's no upgrade. Now these days a tow package can include all sorts of crazy computerized stuff and different gearing and engines, but back then, it included putting a hitch on your truck and calling it a "package", aside from the transmission cooler.

 

You mention an upgraded “fan clutch” that would have nothing to do with the clutch between the engine and transmission. A longer engaging fan clutch would keep the radiator fan spinning longer and hopefully cooling the engine better while under load of pulling a trailer.


back to your driveline clutch… Tacos and 4R perform portly with a lot of manufacturers clutches except Aisin. I don’t know why, but so have had issues with every non Aisin clutch I’ve installed in a Toy.

Clutch performance and rating (hp or towing capacity) comes down to the spring force the pressure plate exerts on sandwiching the clutch disc between the pressure plate and flywheel, and the aggressiveness of the clutch disc material to bite into the flywheel and pressure plate.

The squeal you heard, did anything make it better? Would it go away if you applied a little pressure on the clutch pedal? Would it make the noise through the entire range of pushing the clutch pedal in? Did it change frequency with engine speed?

It could be the pressure plate wasn’t tightened down evenly and one of the fingers are up higher putting the bearing askew.

It could be the bearing isn’t fully clipped into the clutch fork.

It could be the pilot bearing making noise on the nose of the input shaft if that wasn’t replaced or lubed.

It could be the pivot ball wasn’t lubed.

 

Don't do that!
Since this is a hydraulic clutch the master cylinder needs to fully return to relaxed, unapplied position in order for the hydraulic port inside to open to the reservoir. This makes it self adjusting and if you monkey with it your clutch will eventually quit working because the disc wore down.
on a hydraulic clutch if it slips you replace it, if you can't shift you bleed it, if it makes noise you replace the throwout bearing or the clutch disc or the pilot bearing.
The throwout bearing is designed to have zero pressure (or just the tiniest bit) on it when your foot is off of the pedal but pushing lightly on it will often quiet funny noises.
Don't take this as a sign that you should have pressure on it all the time as it will wear the bearing out prematurely.

 

Yes when I apply light pressure the chirp stops, Toyota didn't know anything about differences in clutch pedal assemblies or tow packages from factory and like y'all say that stuff can be added at dealer. And prolly like y'all say is that I need to go with Aisin Thanks