Looking for 8.8 gear sets
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4wd Low
Joined: Jan 2019
Posts: 13
Likes: 1
From: Phoneix AZ
Thanks for reading and responding: My plan is to install a 6R80 transmission, with its very tall lower gears I figure I will have the same or slightly better take off. And get great MPG on the highways in top gear.
And yes I am aware of the possible lugging of the engines, but I will be running stock engines which in my testing have enough torque to pull my car at speed and RPM.
My ideas that I worked out so many years ago are coming to life in a number of ways, first was the Chevy TPI, all modern Ford Crown Vic (4.6, which is smaller that the classic 289) and many vans and trucks with the Ford Modular engine (4.6 and larger) have been running Ford's version of a TPI.
Now the Corvette C7 with its high performance 6+ litter engine running Chevy's version of the 6 speed transmission is running a 2:47 rear end and gets 29MPG with it...in a car that can do 0 to 60 in under 4 seconds and a top speed of over 170MPH.
I think it works.
Rich
Here is the RPM/speed charts of say a Ford Crown Vic with its stock gears and a 6R80 transmission compared to a 2:26 and 2:47 rear ends.
My ideas that I worked out so many years ago are coming to life in a number of ways, first was the Chevy TPI, all modern Ford Crown Vic (4.6, which is smaller that the classic 289) and many vans and trucks with the Ford Modular engine (4.6 and larger) have been running Ford's version of a TPI.
Now the Corvette C7 with its high performance 6+ litter engine running Chevy's version of the 6 speed transmission is running a 2:47 rear end and gets 29MPG with it...in a car that can do 0 to 60 in under 4 seconds and a top speed of over 170MPH.
I think it works.
Rich
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
Better acceleration is part of having a transmission with more lower gears. The other is an effort to keep the engine running in its optimal range for power or efficiency. I'm guessing that the 6R80 needs a computer to control it, and its computer either works with, or is part of, the engine control computer. I'd be curious to see how it would work if you did not keep the engine and transmission together with their computer. But yes, if the engine can generate enough torque to drive the really tall gears, you can get both very high top speed and mileage.
Thread Starter
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4wd Low
Joined: Jan 2019
Posts: 13
Likes: 1
From: Phoneix AZ
There is a aftermarket control for it.
https://www.usshift.com/?utm_source=...%20computer_MS
Should work well.
Rich
https://www.usshift.com/?utm_source=...%20computer_MS
Should work well.
Rich
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