8-Speed Automatic Question

[Jmbeachner]

I just recently purchased my first Jeep JL 4dr Willys. And for the most part absolutely LOVE it. My Gf also purchased a Willys and having driven both through different parts of our community, I notice that mine tends to hold itself in 7th gear longer at 70-80 mph…obviously impacting fuel economy. The only difference is that I’m running with the top off and hers isn’t. Has anyone else had an issue with the transmission not wanting to stay in 8th gear on mostly flat highway? And not being an expert in aerodynamics, could it just be that there is greater drag with the top off?

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[west tex]

The top off creates turbulence, which translates into drag.

 

[aldo98229]

Modern transmissions learn to adapt to their owner’s driving habits.

Sounds like you have a heavier foot than your gf.

 

[Suffolklou]

Mine stays in 7th at 70mph. I have 4.10 gears and 37" tires that took away 8th. Do both Jeeps have the same size tires and same gear ratios?

 

[Longhair1957]

What he said

 

[Heimkehr]

As mentioned, the 850RE is a learning transmission.

Over time, the 8-speed in my JLU has adapted to my light[er] right foot. So, on those occasions when I give it a few beans, the transmission doesn't always downshift (a) as quickly as I might like, as it certainly would when (b) the vehicle was still new with low miles.

That's not really a complaint, since my high average fuel mileage is 28 mpg. If I need speed now, I can always use the Auto Stick function to quickly choose the gear I think will work best when I give the accelerator a good press.

 

[Jmbeachner]

Mine stays in 7th at 70mph. I have 4.10 gears and 37" tires that took away 8th. Do both Jeeps have the same size tires and same gear ratios?

Yeah same exact vehicle. Both with factory Willys wheels and tires.

 

[Reinen]

I just recently purchased my first Jeep JL 4dr Willys. And for the most part absolutely LOVE it. My Gf also purchased a Willys and having driven both through different parts of our community, I notice that mine tends to hold itself in 7th gear longer at 70-80 mph…obviously impacting fuel economy. The only difference is that I’m running with the top off and hers isn’t. Has anyone else had an issue with the transmission not wanting to stay in 8th gear on mostly flat highway? And not being an expert in aerodynamics, could it just be that there is greater drag with the top off?

Yeah, driving with the top down on the highway is almost like driving with a parachute. Tremendous drag. That and you likely have a heavier foot and the trans has learned to anticipate your greater need for speed.

 

[davewald]

I was watching mine closely while driving 70+ mph for over an hour Sunday with the top down, and I was staying in 8th gear most of the time.

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