[titaninak]

Originally Posted by Titan-ization

Ok, here we go.....try to make this short and sweet.. The transmission (trans) cooler is fed from the radiator. The radiator acts as a heat exchanger, if you will for the transmission via the trans lines). The radiator is basically cooling your engine and transmission, but each has their own thermostat to control the amount of "cooled" fluid ti wants to flow through the lines. If you have a clogged line, bad thermostat, etc. etc. you are going to have cooling problems with the transmission. The gear tolerances for spacing and throw out bearings, etc. are pretty tight, if they start to overheat due to lack of temp control from the trans cooling lines, the internal parts (gears, etc.) will expand, this will cause metal on metal contact due to the expansion from the heat, creating the metal 'shavings". Over time this will also round out the gears, causing the slipping of the trans trying to shift from one gear to another and "engage" into another gear. This can also lead to "hunting" for gears, if it does not lock into the proper gear during shifting.
So, there must be something wrong with the lines from the radiator to the trans cooler and that is why all three are being replaced.
**on a side note: expansion and contraction of the gears from heat is normal, within a specified temperature range. The spacing of the gears are set up to accomodate the expansion effect from heat, but within a specific heating tolerance coefficient. i.e. from 0-240*F with normal operating range being between 110-180*F, as an example...this is a random figure to illustrate my point, not necessarilly the actual figures for the Titan trans temps.**

Hope this helps a little.

dude thanks for the explanation, that is way more than the service advisor gave me. (maybe you should work as a service advisor) update- they are slow boating parts and should be 1st week of may before i get my titan back, i am driving a altima as a loaner from nissan.

the advisor said he has seen about 3-4 titans with tranny failures this past year in anchorage. I believe they were all 2006 models. Hmmmmmmm.. not good but i am so looking foward to getting the T back.....