mwsnow

I've been lurking as an unregistered guest for a couple weeks. Just bought a 1990 SR5 4x4 Extended Cab V6 Pickup with manual transmission.

Some details about the truck:

• Full Rancho suspension. Control arms, torsion bars, dual front shocks. I think it may be slightly lifted from stock, but I can't really tell.
  
• Truck originally came with 225/75R15 tires, but now has 31x10.50R15 with the usual problems that come with too-tall gearing.
  
• K&N open element filter conversion. I have the stock parts and will be reinstalling them this weekend. I don't like the noise above about 3400 RPM.
  
• MSD 6AL ignition box and Blaster coil. Is this an improvement over stock? I have the stock parts.
  
• I have no owner's manual for the truck. The local Toyota dealer told me they are about $90!

And some simple questions to get me started in the right direction:

• What grade of oil is specified for the 3VZ-E engine? I live in the desert, where the temperature mostly ranges from 50-120 F. I rarely buy any oil other than Mobil 1.
  
• What is the correct tire pressure (front/rear) for the 31x10.50 tires? My door jamb sticker only lists the 225s.
  
• When I turn the front wheels all the way to lock in either direction, I get popping noises from the front axle joints. I have seen a post in another forum that said this is normal, but that doesn't seem right to me. Is the popping sound normal? From a quick look, I can't see an adjustable steering stop. Is there one?

Thanks in advance

jjrgr21

ebay the owners manual, tires- what ever is on the tire, as far as i know all toyota's get 5w-30 from factory; but my first sergant used 15w in south georgia due to the heat in his 3.0, and all was fine, put like 300k on it before replacing the rear main seal.

jjrgr21

ebay the owners manual, tires- what ever is on the tire, as far as i know all toyota's get 5w-30 from factory; but my first sergant used 15w in south georgia due to the heat in his 3.0, and all was fine, put like 300k on it before replacing the rear main seal. the poping sound is most likely the manual hubs, they could be over packed w/grease, take them off totally strip them clean, and lightly regrease. i had the same thing on my 98' taco.

sorry about the X2 accidently hit "quote" instead of "edit"

CJM

Look at the tires for the max pressure, then put in 2-5lbs less than it says. If you go by the doorjamb of course it only lists the stock OE tires.

I would use 5w30, thats thin and perfect for high temps. In NJ I always run 10w30 b/c most of the year is below 70F.

MMA_Alex

ebay is an excellent place to find the manual assuming you want it. I dont recomend the pressure on the side of the tire as that is the max pressure. using that, and how the tire looks you should be able to determine an aproximate inflation pressure which can be fine tuned over time if you pay attention to tread wear. not sure of all the mechinacal stuff on the engine as i have a 22re, but im sure a lot of that info can be found by using the search feature

CJM

Just wanted to note, on all my cars and in auto voctech school (I am certified) you always use the sidewall pressure listed. This is b/c like I said the number that the car specifies is only for your stock tires-what comes on the truck.

On every single vehicle I run the tires about 2-5psi lower than the max and all my tires got 50k or better out of them.

Figit090

definatly dont inflate to max tire pressure. if worried go to or ask a reputable tire place...but the 2-5lbs down from max like CJM said seems good. tires heat up and that causes the air to expand...if you're already at max pressure you'll breach it when you warm those puppies up. I'm not sure if the tire companies give tires a bit of flixibility past this limit for user error but i'd rather have excessive tread wear than a blowout

Marc

Manual lists the following for air pressure
Tire Pressure > 75mph 29F 32R
Tire Pressure < 75mph 26F 29R
I use 10W40 for summer and 5W30 for winter.

Paul H.

10W30 is recommended unless temps drop below 0 then 5W30 is for you and tires are 35psi rear - 32 psi front. Not too soft, not too hard. the popping is from the steering stops, put grease on them and the noise should go away. This is common on toyota trucks.

slosurfer

My last set of 31's the tire store said 32-35 psi.

breknraj

The popping sound at full lock sounds more like the steering stops. Quick and easy fix is to smear a little grease on them. Do a search for pics to show you where.

86SR522REEFI

In a regular passenger vehicle no matter the tire size. 32 psi is in my opinion, the pressure to set your tires

CJM

Guyw, I am not gonnq say this again. The only tire pressure thats good for the factory specs is on the original tires that came with the truck..nothing else. If your not running stock tires or rims it doesnt apply to you.

If you were to run your tires, say the factory setting was 25 psi when your using 33" bfg at's and the truck came with 235 bfg street tires you will wind up underinflating the tires. Ever wonder why your tires wear out so much? If you under inflate you waer out the sides of the tread asap as thats what your trucks riding on, if you over inflate the middle is being worn away..

My 31x10.5x15 hankook tires list a max psi of 50, I drop it as a rule always 5-8 psi less than max. In this case I run 42 psi in all the tires, your optimum driving inflation pressure is about 90% of the maximum listed on the sidewall. If I was to use the manual/door jamb I would be underinflating them as it clearly states for 235/75x15...Dont trust the manual unless your running the stock sized tires, and even then I would question it since your not running the same tires you bought it with (least I hope your not running the OE junk)

Scroll down to the end of this page and try the chalk test on your tires.. http://www.thedieselstop.com/content...re%20Inflation

I have gotten exactly or better what the manufactuer says the tires will get in life in miles.

ovrrdrive

Wrong...

LT tires list a max presure, not a recommended one. There is no way the pressure will be the same with a toyota on 33's as it will be with a full sized ford on the same tires.

I have always run my 32's at about 40 which is definitely overinflated for my truck but I get a little better gas mileage and less rolling resistence by doing so. The tires will ride in the middle even at 40psi, but not too bad.

I would suspect the optimum pressure for the Bridgestone Dueller AT 32x11.50 max 50psi tire that I run on my truck to be somewhere around 32-35.

aviator

The price you are being quoted for the manual sounds like the price for the shop manual, if all you want is the glove box manual it should be less, however if they have to do a special print run of it then $90 seems cheap, but check Ebay as folks have said. I run 5W30 full synthetic year round with no troubles at all however if you drive in warmer climates most of the time you might want to go with a 10W30 synthetic as the heat ambient range on that runs slightly higher.