Drivetrain - 4T60-E

[RobertISaar]

this is all i have so far.

The 4t60-e was first introduced in W-cars in 1991 on 3.4 and 3.8 cars, with other engines getting it later. the 3.1 LH0 and 3100 L82 recieved it in 1993. in 1994, PWM torque convertor operation was implimented in all but the 3.1 LH0 cars.

only in 1996, the 4t60e-hd was installed in the larger L67 cars, and it still retained all of the normal controls that all 4t60e transaxles had until this point, allowing for a stronger transaxle to be installed in earlier cars without much finesse. i'm not sure if there are mounting differences, but those could be worked with.

during the entire production run, all 4t60e's have had 2 shift solenoids and a vacuum modulator. luckily that modulator interchanges with a lot of other GM hydra-matic transmissions, allowing us to use an adjustable vacuum modulator meant for a TH-350 and will allow changes in shift firmness. to change shift points, computer tuning is required. all but the 93-95 3100 PCMs have been documented and will allow for shift point, torque convertor lock/unlock changes. some of the PCMs with PWM TCC apply and release have those tables discovered as well.

[RobertISaar]

slight change: i guess the PWM TCC started in 1991 actually, or at least the wiring diagram to a 91 Reatta says so... but W's didn't get PWM until the 93 3800 and 93 3100...

[RobertISaar]

ok, a little more info. if it's not listed, i don't know it. all of these pertain to W cars only.

W-Body 4T60-E info

1991-1993 3.4
3.43 FDR
30 tooth VSS reluctor
2095RPM stall

1993-1994 3.1
3.33 FDR
30 tooth VSS reluctor
2060RPM stall

1993-1997 3100
3.33 FDR
30 tooth VSS reluctor
2095RPM stall (PWM)

1994-1996 3.4
3.43 FDR
30 tooth VSS reluctor
2060RPM stall (PWM)

1994-1995 3800
3.06FDR
31 tooth VSS reluctor
1897RPM stall (PWM)

1996 3800
3.06FDR
30 tooth reluctor
1897RPM stall (PWM)

1997 3800
3.05FDR (fine pitch)
30 tooth reluctor
1897RPM stall (PWM)

[xtremerevolution]

You sure about the FDR on the 3800 94-95? I don't know why I remember it being 2.92...

[RobertISaar]

You sure about the FDR on the 3800 94-95? I don't know why I remember it being 2.92...

according to compnine, all 3800 regals in 94-95 got 3.06 gears...

[Crazy K]

some good info on transmissions can be found here:
http://dtcc.cz28.com/transmission/index.htm

[RobertISaar]

some good info on transmissions can be found here:
http://dtcc.cz28.com/transmission/index.htm

i've actually seen that before, and somewhere else had those PLUS 4t60 info up to 1990...

[xtremerevolution]

All very good information. These resources will do very nicely in the ebook.

Like I said, things you should know but can't find in a service manual. That's what this is all about.

[bronze93]

Link has changed :

http://www.gmtuners.com/transmission/index.htm