Toyota: 1991 toyota truck shakes after 50 MPH and theres a clicking noise, toyota v6, altenator


Question
YO! thanks for the sites, they helped ALOT! ok well ummm that "clicking" noise has stopped along with my truck. the noise was infact coming from the valvetrain and it blew a header and that just threw off the sensors which melted my altenator and my injectors and the tranny belt broke along with the power module belt. the fan is leaking along with the tailgate fluid. the dealership said it'll cost about $10,000 to fix. what do you think i should do, fix it or junk it?-------------------------
Followup To
Question -
thank you for the detailed answer that you gave me. the thing is that the truck came with brand spankin' new tires, size 33 if i might add. so since you conclude that this is the problem, could it be that the tires are oversized for the truck since it's not lifted? and i have another question if you dont mind. when i'm driving and the higher the RPMs reach, the louder a "clicking" noise gets but it never gets louder than the engine does. like if im driving at 35 MPH and my foot is on the accelerator, there's a noise, but if i push in the clutch, the noise stops along with the engine noise (of course). the "clicking" sounds like it's coming from behind the firewall on the driver's side and it sounds like it's not getting oil where ever its coming from. but there is NO oil leakage, the oil pressure is always normal, and it's not burning any oil. so could this be a problem inside the engine itself or a problem with the tranny? i'm gonna look more into this problem at the dealership, my friend, and on the internet, but your answer would be much appreciated. thank you for your time. -------------------------
Followup To
Question -
i just bought a 91 toyota V6 3.0L extd cab truck with manual transmission 2 days ago and it drives great, has the power its supposed to have, and everything i expected. BUT, when it gets up to about 50 MPH its starts to shake. it doesnt shake hard enough to throw it off the road but just enough to know that its not supposed to do that. i asked my friend that works at a dealership for cadillac and jeep and he says that the valves need to be adjusted. but i also went to the toyota dealership and they said that if the valves needed to be adjusted, that it would shake no matter what speed i'm going and he pointed out that it could be the steering rob because there's a recall on steering rods but i dont think that a steering rob could be the cause of this shaking. he also said that it could be that the front-end alignment needs to be adjusted but it doesnt swerve in any direction when i take my hands off the wheel while driving. so could you PLEASE help me? thank you

tyler
Answer -
Tyler, that's a nice truck you got there:)  Anyways, you say the car shakes at about fifty mph so where I'd look at first is suspension and steering.  If you feel the car rides dead-on straight, then the only other thing I'd look at is your tires.  Are they worn?  If so, are they worn in the same way? (Both front tires)  My guess is that you may need to have your tires balanced.  While your tires may be balanced, sometimes the weights used can shift from their orginal position and sometimes careless technicians don't do it properly (just fast.. to make a quick buck)  Check your air pressure on all four tires.  As well, make sure you are rotating your tires because they allow for even wear as tire rotation forces them to be on all four points of your car before you dispose of them.  

I hope this helps!  
Answer -
No, oversized tires are fine.  You don't need a lift UNLESS you have the tires rubbing in the wheel well when you drive, brake, or turn.  I do remember reading an article talking about a vibration being caused by tires with an agressive tread set-up.  

Here are some links to read up and hopefully help out with that.
Links:
http://www.off-road.com/toyota/tech/balancers/
http://www.centramatic.com/

Now, the clicking..  Could that be the valvetrain?  Maybe some valve tapping due to old age.  The noise is in relation to engine RPM.  But, what I'm curious about is if you can hear it only when you let out the clutch to move or can you hear it even if you had the clutch pedal in while revving the engine?

Answer
Well, is ten grand worth it?  Well, it is your money.  For me, if the truck was like a family heirlom or my first car or something I just couldn't part with, then I'd try to source the parts used and try to do it myself.

Should that be the case:
http://www.car-parts.com
This is where you need to go my friend.  

But, if I could care less about the car and I don't mind getting into car notes then maybe the all new 2007 Tundra would be a nice truck:)  Used Toyos would be something nice like a old-school FJ20 (Land Cruisers) or a nice Toyota 4Runner.  

Let me know what you decide to do and I happy that I've been able to help so far.

P.S. The only OTHER THING I would do is probably go for a good engine under the hood seeing as this one is dead.  For a truck, I'd go for the 1UZ-FE engine found ONLY in the Lexus LS400.  V8 DOHC, yeah baby..  Dual exhaust, aggressive tires, and a nice LSD, that's all you need;)  You can also just buy a GOOD condition head for your engine and just replace the other parts.  

Ohhh.. Do you think you could send EVERYTHING that Toyota said you need.  I just am curious.