Moderator: volvite
All valid questions. Even more confusing when you consider that the RER505a transmission is also used on the Armada and Titan platforms with the same final reduction.CPLTECH wrote:Pardon me for asking more questions, but I have yet to find a satisfying answer to calm me down.
I saw elsewhere on an Xterra forum that only gear #3 & #5 go into TC lock-up. So I looked at the Serv Manual and sure enough that is what the chart below shows. But why did Nissan choose to ignore Gear #4 TC lock-up, the gear for towing?
I am also confused (perhaps due to a translation from one language to another) as to the statement that “Slip Lock-up Control” IS used in gear 4&5 to improve FE (how if half-clutched?) but “Lock-up Control” is not used in 4th. Confusing.
There must be a reason why Nissan and aftermarket programmers have not ventured into this area. Why? What do they know that is not common knowledge? Yet this product family is advertised to tow 5-6K#. So, is this transmission able to withstand the temps that occur in 4th? But I want better mileage? I recall that in the GM 4L60E, whenever towing and the TC unlocked in final gear you had best drop a gear or the heat build-up would damage the trans.
I dunno, CPL... I don't have all the answers I want...CPLTECH wrote:One poster said a possible reason the tow gear (4th) stays unlocked is due to the "shock & awe" that a trailer puts on a drive train. Sounds reasonable enough.
Nuff said. Now let's get to the next subject at hand...