5-speed A750 trans won't shift in to 5th gear. (8 Viewers)
- Thread starter MongooseGA
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- Thread starter
- #202
Learn something new everyday. What would we think is a reason for Toyota to lock out top gear/ OD for low range?
Seems counterproductive to be in low range but then want overdrive. If your much over 20mph for long you should probably be in high range, anyway.
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- #204
Generally I'd agree. Wouldn't hate having a 5th/OD with the reduced case gears though.
I use low range all of the time in the large hills/mountains of the PNW/Idaho/Montana and love the extra power and control I get ascending and engine breaking descending the hills.
Another huge benefit is the lower (and steadier) coolant and transmission temps (I watch them religiously). They can get pretty high going up hills/mountains in high range. Wayyy higher than I like to see.
It's easy for me to get to 20mph and even higher during these adventures too. I'm still pretty positive I can get access to OD while in low, but admit I could be wrong, especially since Bisho tried it and it didn't kick into OD. Bisho, you didn't have your center diff locked, did you?
Another huge benefit is the lower (and steadier) coolant and transmission temps (I watch them religiously). They can get pretty high going up hills/mountains in high range. Wayyy higher than I like to see.
It's easy for me to get to 20mph and even higher during these adventures too. I'm still pretty positive I can get access to OD while in low, but admit I could be wrong, especially since Bisho tried it and it didn't kick into OD. Bisho, you didn't have your center diff locked, did you?
No, center diff was not locked.
I only felt the need for more speed in low range in the sand dunes. A couple times I was flooring it and banged off the rev limiter for several seconds straight. Still does 35-40ish in low range in 4th IIRC.
- Thread starter
- #209
Out for delivery today! I'm giddy like a little schoolgirl.
- Thread starter
- #210
Hand shaking now. Updates in 35ish minutes.
- Thread starter
- #211
We're back in action!
I didn't cry or anything.
Another huge thanks to everyone who helped out in getting this solved. Y'all saved my cheeks.
I didn't cry or anything.
Another huge thanks to everyone who helped out in getting this solved. Y'all saved my cheeks.
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- Thread starter
- #212
Also, confirming no 5th gear in low range. I have completely never noticed this, but I do spend most of my low range time in lower gear.
Malleus
Far west of Siegen
So, to put a bow on it: this was all due to a faulty ECU?
- Thread starter
- #214
That seems to be correct. I've updated the original post stating as much.
First test was smooth operation from P to R exiting the driveway, then no slamming from 2nd to 1st at the nearest stop sign, then down shifting with throttle jab, and finally, correct shifting in to 5th.
Malleus
Far west of Siegen
damn computers
- Thread starter
- #216
Right? This is why I like stupid cars.
I thought a celebration was in order!
As a mechanical/electrical engineer, as soon as computer scientists get into an area of my life, it just gets harder...
