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Old 12-23-2006, 12:43 AM   #1
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Default Whats the difference?

What are the differences between a THM440-T4 and a 4T60-E....like what was taken out and what was added. How does it work differently, and has anyone noticed a real difference in how they shift?
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Old 12-23-2006, 01:25 AM   #2
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Default Re: Whats the difference?

Quote:
Originally Posted by wjcollier07
What are the differences between a THM440-T4 and a 4T60-E....like what was taken out and what was added. How does it work differently, and has anyone noticed a real difference in how they shift?
well im not too versed in the mechanics of our transmissions but the 4t60-e is electronically controlled where as the older trannies are not.
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Old 12-23-2006, 01:57 AM   #3
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My 4T60-E still has vacuum controlled shifts.
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Old 12-23-2006, 02:02 AM   #4
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can u feel a difference in shifts between electronicly controlled and non electronic controlled?
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Old 12-23-2006, 02:16 AM   #5
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i thought that it switched over to electronic shift on the 4T65-E...but im not 100% sure
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Old 12-23-2006, 02:31 AM   #6
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well obviously i know that the THM440T4 is not electronic and the 4T60e is...but I want to know, what is it about the transmissions that are different and is there any noticeable difference in performance such as upshifts and downshifts. Like is there a shorter delay on downshifts?

All I wanna know is, what makes the THM non electronic and what makes the electronic ones...ELECTRONIC?
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Old 12-23-2006, 02:36 AM   #7
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I may be totally wrong, but on the Electronic transmissions there are shift solenoids that make the gears shift, and on the older hydraulic transmissions, they shift from fluid pressure? I do know that the electronic transmissions shift faster and more accurately than the older non-electronic transmissions.
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Old 12-23-2006, 03:11 AM   #8
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Quote:
Originally Posted by wjcollier07
Like is there a shorter delay on downshifts?
That would be one of the differences. The 4T60/65-E is controlled by the ECU (if not, a seperate trans computer, I dunno).

Barring a kickdown cable adjustment, it would take a couple extra moments of having your foot planted before the 4T60 in the '91 SSE would kick down.
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Old 12-23-2006, 11:44 AM   #9
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THM440-T4 also known as the 4T60 (no E).
Vacuum controlled shifts. PCM is blind to it.

4T60E. PCM controlled shifts, vacuum modulated.

4T65E. PCM controlled shifts, duty-cycle modulated by the PCM.
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Old 12-23-2006, 01:35 PM   #10
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The 440-T4( 4T60 ) is a fully hydraulic unit, with the shifts being controled by a govener and various valves in the valve body directing fluid flow to the proper circuits... shift timming is controled by the Kickdown cable, shift feel is controled by the Vacume Modulator...

The 4T60-E uses 2 solenoids in an ON OFF configuration to shift into the correct gear controled by the PCM, The PCM uses the TPS'* Voltage( Load ) for the kickdown signal among fueling...

In the 65-E the line pressure is controled electronicly via the PCM..

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