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Getting 225k out of these is pretty darn good. The price that Firestone quoted pretty much sucks. I would shop around for a better price. (I am assuming you mean the front CV half-shafts). Passenger shaft: about $85 Driver side : about $130 for the parts. Motor mounts : About $300......then add labor. 1897-515= $1382 labor?? I must be getting old!
No, it is not. Issue is a suspension component or the CV half-shaft is causing excessive force on the bearing. Usual culprit is worn out struts causing harder impacts on the bearing.
Here's a procedure for ya: http://www.ehow.com/how_7298834_replace-toyota-sequoia-starter.html Lengthy process.
Try the estimator at the top of the page.
First, you need to determine the cyl. 1 and 2 misfire issue. Need to check plugs, wires, coils. Second, this could be an exhaust system issue. Usual culprits are failing cat. converter or EGR issues. The one that fools the scanners the most is a cat. converter issue. Good luck. If spark plugs have not been replaced yet, now is a good time.
If nothing is wrong with the spring, you can change just the inside strut. A coil spring compressor is needed in this case. Otherwise, see if you can get 'quick-struts' a fully complete coil and inside strut assembly. They cost considerably more but, all you do is remove the old one and bolt in the new one. A front end alignment is almost always required after strut replacement.
Here ya go: http://www.youtube.com/watch?v=Uxm65JmV348
What is the check engine code? Get free read at an autozone and post on here. Sounds like a cat. problem, need codes to be more positive on diagnosis.
There has to be a leak if the oil is disappearing. Check the spark plugs for oil on top of them. Could have a failing valve gasket and blow-by issue with one of the spark plugs.
Yes, will need swivels (universals) for the difficult rear plugs. http://www.ehow.com/how_12217132_change-spark-plugs-1989-thunderbird.html Having various extension lengths will aid you as well.