The V8 Owners Forum -

A good V8 needs an appropriate transmission behind it.

My Jensen Interceptor was running 3100rpm at 120km/h in 3 with its original Chrysler A727 transmission. This simply would not do in this day and age.

Now its running with a GM 4L60e (electronically controlled) transmission and now its doing 2000RPM at 120km/h (in 4th, with torque convertor locked)!

The transmission is being controlled by a Megasquirt product called GPIO and its running the "Extra" Transmission Control firmware.

A comprehensive thread on this conversion can be found here:http://www.joc.org.uk/phpBB2/viewtopic.php?f=4&t=17192

Feel free to ask questions if you have any.

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JSF55 wrote:You need to be logged in to read that page

Any questions I could help with?

Just something to read on a Saturday night, was looking at the gearbox controllers before

JSF55 wrote: was looking at the gearbox controllers before

OK, read about the GPIO (TCU) hardware here: http://www.msgpio.com/manuals/index.htm

You can now choose which firmware (the software that runs on the hardware) you want to run on the GPIO:

1) Megashift: http://www.msgpio.com/manuals/mshift/4L60e.html

OR

2) Extra: http://www.msextra.com/product-range/ex ... n-control/

I'm running the Extra FW is perhaps easier to configure but less feature rich than the Megashift FW. The Extra FW can also run on the "Microsquirt" pre-assembled hardware which eliminates the physical build of the TCU if you are not that way inclined.

Thanks phillip, not looked at phils site (extraefi) for a while, should make a good read

I remember looking at a prototype of that years ago - I think James wrote it over one weekend - we were both looking at 4L80e's at the tine.

Have you upgraded the internals of the 4L60e? - Out of the box they are not particulary strong, especially with that 440 in front of it.
I've driven a 440 powered Dakar and it had the same low end grunt of my 350 turbo chevy - and I broke the 700r4 (a Manual 4L60) many times before i found a combination of parts that would last. It works well now and I subsequently sold the 4L80e setup.

If its anything like the 700r4 you want your line pressure at around 200psi when putting maximum torque through it. Listen/feel for slipping going from 2-3 and 3-4. Dont apply the TC under heavy load - as the clutch inside it is tiny (unless you are running an aftermarket one that allows WOT lockup)

Why didn't you use the MoPar 727 with OD? The club has featured it in the mag?












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Michael Rogers
NTERCEPTER ii

Dear PhilpL,

How many solenoids are fitted into this gearbox and how many are used for switching gear?

Do you have the layout of this switching pattern? In a ZF gearbox only 3 solenoids are used for all 4 gears. Very easy to manipulate.

Do you run this gearbox behind a Rover V8 ? Are there any bellhousing that fit Rover V8 ?

regards

Dirk

sorry, 2 solenoids in ZF, not 3

Late SD1 have a GM box with detachable bell housing. I've often wondered if a later 4 speed (or 5) GM box could fit to that.

I was hoping, exact the same. If pattern is still the same. As far as I found out the "attachable" boxes seems to use the same pattern. Of course, does not mean it's still the same as the very early boxes but you never know.