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Hi KB,
I looked on www.holdencrazy.com the TCM files have OS id number starting with 2.
I looked inside the 2xxxxxxx files, they all seemed to be either 4L60/70E or 6L80/90.
The visible 4L80E calibrations are identical to the 4L60E.
Differences between 4L80E and 4L60E from TCM perspective:
- truck 4L80E/4L60E unlocks TCC on closed throttle decel whereas car 4L60E keeps it locked;
- 4L80E has single solenoid TCC whereas 4L60E has dual solenoid TCC;
- 4L80E has slightly different shift solenoid sequence than 4L60E.
If you have same OS id's then you can segment swap...
With the LS1 PCM this is easy as car 4L60E and truck 4L60E/4L80E both used OS 12212156.
With TCM this is not so easy (as you have found).
4L60E segment can drive a 4L80E transmission with the addition of 1 relay (shift solenoid) and repinning of two wires (TCC).
Are you looking at a swap...?
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I was just trying to help someone out.
http://www.gm-trucks.com/forums/inde...ic=123115&st=0
Maybe get an education in the process.
Thank You for that information
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Still sorting this out. Do some gas vehicles have a TCM, while others have only an ECM (with tranny tables)?
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Hello killerbee,
Took a look at the link to the other thread … 2002 6.0 L (LQ4) with 4L80E. That truck will have a PCM only (LS1-B style) - no TCM. In that model year, if it came equipped with an Allison transmission it would have also had a TCM.
The current ECM & TCM combination began in Gen IV equipped trucks in mid 2007.
Regards,
Taz
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I am getting enlightened a bit at a time. Do you think my assessment of trans temp creep may have been correct?
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Didn’t read the whole thread … in 3rd gear TCC release can be affected by temperature. At low % TP apply / release will vary a bit.
Once you’re above 50% TP in 3rd gear TCC application is around 68 MPH (109 Km/h) for “Normal” and “Tow Haul” modes, and may be as low as 25 MPH (40 Km/h) in “Hot” mode.
Above 50% TP in 3rd gear TCC release is around 38 MPH (61 Km/h) in “Normal” and “Tow Haul” modes, and may be as low as 20 MPH (32 Km/h) in “Hot” mode.
The above quoted speeds are from a truck equipped with 29.6 inch diameter tires and 4.10 gears. These speeds will vary with different tire size and gear combinations.
Regards,
Taz
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Sorry … Tow Haul mode is “Performance” mode in the tune …
Regards,
Taz
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Isn't it odd, the allison TCM has nearly no temp constraints, accept for TC warmup defeat.
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1 Attachment(s)
Need a bit more help...
The new trans and program seem to be working OK, more or less. I am having a bit of trouble with a hard shift on 2-3 and 3-4 in some instances at about 50 percent throttle or so up to WOT. At WOT the 3-4 shift is way too hard, and I'm thinking that a line pressure reduction might be in order. On the shifting, there is a good, crisp, hard performance shift, then there is what I have that feels like it's going to break something. The trans itself is a FLT Level 3 4L80E with a TCI low gear set changing 1st gear from 2.48 to 2.75 and 2nd gear from 1.47 to 1.57. I've attached what I plan to load next to help with the shifting, but it's going to need tweaking. Thanks for any advice.
