Which is harder on a transmission?

[carbon]

3.73 doesn't look too bad... but how to adjust the speedo is the question. Not running obd-II here.

[IsaacHayes]

VSS road speed constant.
Read this, to get an idea

http://isaachayes.60degreev6.com/OBD1swap/94-95_LBody_Tuning_Guide_BETA_11-10-09.pdf

You may want to go to that PCM in that guide there. It will shift a 4T60-E........ Then you'll have more options and can change shift points.........

[carbon]

Sorry... whats an L-body?

[robertisaar]

Sorry... whats an L-body?

beretta/corsica

[3400-95-Modified]

I'm running the comparable 3.69 ratio since I'm using the better 3.29 version of the 4t60e. They upgraded the roller sprag and a few other things and then that resulted in a 3.29 diff. I have the 33/37 chain set and I average about 2500 RPM at 68mph, and that's with a 25" dia tire. TCC locked btw

[carbon]

Any suggestion on what applications the 3.29 would have been used? Also what are the electronic controls on the 60e? It seems from what I have read the 4L60e is more advanced than the 4T60e... is that correct?

[robertisaar]

4l60e is a RWD tranny, hence the L = longitudal.
4t60e is a FWD tranny, hence the T = transverse (could be RWD, but it's still meant for mounting sideways)

if by more advanced, you mean it uses a pressure control solenoid in place of a vacuum modulator: yes.

-E on a tranny means it uses shift solenoids and the shift points are determined by the PCM, as opposed to back in the day, using a TV cable to control when and a vacuum modulator to control how hard. an example of that would be a 4t60.(440T4 depending on which GM docs you read).

some -e trannies don't actually have a -e in the name, the 4t80 and 4l80 being two i can think of. since there were never any old styles of those trannies, the -e is irrelevant. confusing, but unnecessary.

[carbon]

I understood the L and T, I just meant that even though they were both 60e transmissions that they weren't of a similar feature set.

[robertisaar]

I understood the L and T, I just meant that even though they were both 60e transmissions that they weren't of a similar feature set.

...... i guess i went a bit overboard then

[carbon]

Would anyone happen to know where to get the specs on controlling a 4T60E or 65E tranny on the interwebs? I would be interested to know what it takes to run these, things like PWM inputs and such...

[robertisaar]

for the 60e, it's just the shift solenoids and the TCC, PWM on the last one if your torque converter can do it(any can, but there is a specific clutch material meant for PWM applications... those are all either 12 or 5 volt.

65e: now you have to deal with the pressure control motor. i can't tell you anything about that.

[DefEddie]

I wouldn't consider it for a daily driver. 3500 RPM at 70 MPH can be a PITA.

Lol,you sir have never owned a fiero!
Normal for fiero on the highway is abut 70@3-3500rpm i'm pretty sure.
Car has been parked a month so can't remember for positive but I regularly drive on the interstate at 4k rpm for 30m or more.
Just thought that was funny,lol.

Would anyone happen to know where to get the specs on controlling a 4T60E or 65E tranny on the interwebs? I would be interested to know what it takes to run these, things like PWM inputs and such...

This might provide some insight for you I hope.

http://www.gmtuners.com/fiero/transbypass.htm

[IsaacHayes]

3500 @ 70 in a Fiero? Must be the 4-speed manual.

[robertisaar]

3500 @ 70 in a Fiero? Must be the 4-speed manual.

or the TH125C, but whatever it is, it sure isn't either of the 5 speeds...

[DefEddie]

That is on a 3spd auto...th125c