transmission issues

[bigreese]

I have a 92 q45 with 194,000 miles on it. Lately i have been noticing that the transmission seems to drop down in gear as i am riding at 40-65 mph. It also does it during city driving. The transmission also will not shift out when i punch it, but jerks like it wants to shift but can't. Has anyone had this problem and if so what's a good fix for it besides buying another.

p.s. the fluid has not been changed in about 18 months, but is usually changed yearly with mobil 1

[PopPop]

First check your trans control unit for codes. If nothing comes up then your problem isn't electronic but, it sounds like it could be a SHIFT CONTROL SOLENOID. Trans are more bothered by dirty fluids because of electronic components its very important to change trans fluids at regular intervals. You may want to try power trans flush. Then add your mobil 1 with lucas synthetic trans stabilizer.

[Q45tech]

194,000 miles is a good economic life for a Nissan AT. You have gotten your monies worth.

Mixing synthetic with Lucas is about two opposite extremes! Viscosity wise.

After a filter change and pan cleaning and a fluid exchange [BG machine or other types].

Then synthetic and http://www.lubegard.com/automotive/trans_atf.html

But at this high mileage synthetic [cost] might be a waste.............as unit is on borrowed time in any case.

[PopPop]

When I reponded to Bigreese's Trans question I knew exactly what I was talking about with the Lucas oils. ( Q45 Tech) said it was a big difference in viscosity's and you would be right if you were talking about the regular Lucas trans stabilizer but. I did say synthetic Lucas add. which is used with synthetic fluids.

[Q45tech]

Measure the viscosity before and after in a lab is the only way to know for sure.

In theory the major gains from any synthetic fluid are just the viscosity stability [the fact that the molecules are more homogeneous - same sized] at the statistical tails of the operating range.

At the same temperature a synthetic will generally have a tiny bit less friction for the same viscosity.

My point is if you introduce something non standard in a synthetic you may negate the gain.

Lubeguard is primarily an anti oxidant to protect inexpensive ATF.

"Lucas Transmission Additive was formulated to stop slip in automatic transmissions. It also completely stops seal leaks. It cleans and lubricates sticking vales and increases line pressure to reduce rough shifting. Transmission Additive eliminates heat and wear in motorhomes and other hard working transmissions. It's used by many rebuilders to stop comebacks and is easy to sell for preventative maintenance with fluid changes, ..........

From their web site it appears to change viscosity......increases line pressure.

"This is no normal ATF formulation. It has been developed to give the smooth, precise shifts needed by ET racers and yet extends a degree of protection not found in any other ATF. This product will stop wear and tear like nothing you've ever tried.

Key BenefitsSmooth, precise shiftingExtraordinary protectionPrevents wear and tear"

MAGIC?

[maxnix]

"Lucas Transmission Additive was formulated to stop slip in automatic transmissions. It also completely stops seal leaks. It cleans and lubricates sticking vales and increases line pressure to reduce rough shifting. Transmission Additive eliminates heat and wear in motorhomes and other hard working transmissions. It's used by many rebuilders to stop comebacks and is easy to sell for preventative maintenance with fluid changes, ..........

From their web site it appears to change viscosity......increases line pressure.

"This is no normal ATF formulation. It has been developed to give the smooth, precise shifts needed by ET racers and yet extends a degree of protection not found in any other ATF. This product will stop wear and tear like nothing you've ever tried.

Key BenefitsSmooth, precise shiftingExtraordinary protectionPrevents wear and tear"

MAGIC?

Probably just like their oil additive.

Check http://www.bobistheoilguy.com for that hoax.

[Q45tech]

http://www.bobistheoilguy.com/...s.htm

Why I inferred if synthetics are not enough and still need additives....just drop back to conventionals as I have had to do on my 303,000 mile engine.

The purpose of synthetics is to extend the wear interval, when you have reached the point where wear shows symptoms, you have reach a cross over point where other measures are now required to prolong parts replacement.

[PopPop]

What you said ( Q45tech) is exactly so! I'll check more into this product that you spoke of.