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Discussion Starter #1
My frontier has 225000 on it and my timing belt broke. Had a local shop replace it, after all they diagnosed it when Nissan could'nt (needed new motor).
After fixing the timing belt the tranny, BTW (3.3 auto 2WD Crew Cab) wouldnt shift into overdrive. CHeck engine light came on. Tranny guy said that TPS was tripping the light but that tranny was shot. So I bought a used tranny w/ 80,000 on it. The guy that put it in said that it also wasnt shifting into overdrive. So he ordered another used tranny and put it in. SAME thing. So my dad checked the TPS and it wasnt put back correctly. He reset it and then the tranny started shifting fine. Whew
THen a tranny hose blows 1 week later and I take the truck back to the tranny guy. He changes the hose, fills the tranny up and now it wont shift into fourth. I even bought a new TPS and installed, still no shifting to fourth. Can that be caused by somethiing other than the transmission? Sorry such a long story but Im at my wit (singular) end
Nate
 

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It's possible that you lost 4th gear due to transmission damage when the hose blew... fluid starvation is not good.

Heath
 

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Discussion Starter #3
So, I wonder if one of the previous transmissions that were put in the truck might work with the corrected TPS. Have you ever heard the TPS affecting the shifting?
 

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A bad throttle position sensor can indeed affect shifting, but it doesn't sound like your problem lies with the TPS. If the other transmissions wouldn't go into O/D with the mis-installed TPS, my guess is that they will work now that a new TPS has been installed correctly.

You might want to find a different transmission guy. It sounds like the one who decided your transmission needed to be replaced isn't as meticulous as he ought to be.

Make sure your fluid is not overfilled or underfilled. Sometimes, that can cause foaming or starvation (respectively), both of which can cause erratic behavior and lead to transmission damage.

I might be wrong, but it sounds like your transmission was damaged when the hose (which should have been replaced along with the transmission on a car with 225000 miles) blew. If you still have the transmission with 80,000 miles lying around somewhere, you might want to consider having it installed.
 

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The timing belt broke without any valve damage, thats hard to believe.
It happens more often than you might think. If you remove your timing belt and CAREFULLY turn one of the camshafts, you'll find that our engines have a tolerance somewhere around 45-60 degrees +/- TDC @ the camshaft. (I wish I could give a more definitive number, but I didn't want to push my luck). Also, valve reliefs in the face of the piston limit shear stresses on a valve in the event of contact, which mitigates some of the risk of bending/chipping/breaking it at low engine speeds.

Whatever the case, "interference" means that collision CAN happen, not that it definitely WILL happen if the timing is imperfect.
 

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Yeah the TPS will affect the trans as well as many other strange things. When I replaced mine the truck started to shift correctlly again.
 

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Discussion Starter #9
are these tranys run by a computer? I am still having problems with the trany not shifting into higher gears. I took the truck in last week, mechanic is going to put another transmission in and see if there is still a problem.
 
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