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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 08-15-2007, 11:35 PM   #41 (permalink)
wild willy
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BD Brake has an aftermarket Tork-Loc. See their site at http://www.bd-power.com/index.php

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Kennedy Intercooler, 3" Downpipe / 4" Cat back exhaust
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Heath TurboMaster @ 12# boost, vacuum pump removed and Heath, Max-E-Tork 2.0 chip
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Old 08-15-2007, 11:46 PM   #42 (permalink)
jifaire
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Quote:
Originally Posted by wild willy;1943677;
BD Brake has an aftermarket Tork-Loc. See their site at http://www.bd-power.com/index.php
Hey Wild!

Yeah, the BD TorqLok works good, I've been told. But on OBD-I's, you can do it with the toggle switch so that's what I did.

Maybe you know about this, though... you can't do the toggle-switch mod on OBD-IIs because the TCC is Pulse-Width-Modulated; I heard that the TorqLok didn't work too good on them, either, but the AutoLok wasn't bad. The tranny guy I was talking to said the only thing that really worked well was reflashing the PCM.

You've got an OBD-I, same as me, but can you shed more light on this than what I've been told?

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Old 08-16-2007, 08:43 AM   #43 (permalink)
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So you can...

use heaths tcc lockup but wire in a switch to manually disengage it rather than step on the brake ? Because of the gearing inmy tahoe this may be a good idea. I still have to do my homework on my ecm though. I think Bill may have stumbled onto something with that. The guy who replaced it got it from a junkyard. What are the chances it was the right one ? Although the truck runs excellent. Plenty of power hardly any smoke. Got 12 mpg towing. So performance doesn't seem to be suffering.
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Old 08-16-2007, 09:12 AM   #44 (permalink)
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I was looking for that brown wire last weekend

Quote:
Originally Posted by jifaire;1943667;
Look on Bill Heath's Blog... he has lots of stuff on there.

The post about the TCC mod is at:

http://blog.heathdiesel.com/2005/11/...converter.html

Works smooth like peanut butter. Good mod to do, if you have an OBD-I truck. Don't leave home without it!!
But failed to find the wire to splice - is it in the harness on the shift arm - or the large connector to the rear? There appear to be two, two wire noids above - only the front one is connected- is yours like that also?
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Old 08-16-2007, 03:18 PM   #45 (permalink)
wagonwheeler
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Quote:
Originally Posted by stingthieves;1944178;
But failed to find the wire to splice - is it in the harness on the shift arm - or the large connector to the rear? There appear to be two, two wire noids above - only the front one is connected- is yours like that also?
Attached is a pic showing the splice to the brown TC wire. It can be traced back to the large round connector. This was done when I installed a BD TorqLoc.

FWIW, I pulled the BD and am just running a manual dash switch, but this is because with 3.42 gears the BD (which locks up at 30-35mph) was engaging at like 1100 or 1200rpm and this was painfully low - uselessly low. If I'd had 3.73's or 4.11's things would have been much better!

TC lockup makes a significant temperature difference when pulling hills in 3rd (which I'm more apt to do than those of you w/ 3.73's and 4.11's).

Everyone should do this.

Chaser
Attached Images
File Type: jpg TClockup.jpg (141.0 KB, 103 views)
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Old 08-16-2007, 03:30 PM   #46 (permalink)
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Hey, Sting ... there used to be a 4L80e manual on the web, but it's gone now... I'll try to find a diagram of a connector for you. iirc, mine wasn't brown, it looked purple. It was the "S" wire in the middle row of the connector, off by itself.

That may not help you much. iirc, there were different connectors for 2 different series of transmissions... and I'm not sure which one yours would be.

I'll see what I can find.
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Old 08-16-2007, 09:49 PM   #47 (permalink)
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Does anyone have or can scratch up

a schematic on the way to do this. Are you applying power to the circut or just closing and existing circut ?
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GM8 Turbo,DB24911
Raptor 100 lp.
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Autometer Fullsweeps
Serp Belt conversion. HO WP. Dmax Fan
OD Customs 6.2/5 Diesel and MV Vehicle service
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Old 08-16-2007, 09:55 PM   #48 (permalink)
jifaire
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Quote:
Originally Posted by acesneights1
Are you applying power to the circut or just closing and existing circut ?
Circuit is already powered... all the PCM does is ground the return wire from the TCC solenoid; completing the circuit.
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Old 08-16-2007, 11:13 PM   #49 (permalink)
wild willy
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jifaire, I don't have anymore info than you have posted. I didn't know until recently that the OBDII rigs had problems with the TorkLoc. I did my research for the '95 and didn't do any of the OBDII trucks. I do know that the TorkLok has been the best tranny cooler that I have seen. And The back-off mode going down hill is great also.
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Wild Willy
'95 GMC 3500, 'F'-vin, cc,srw,4X4 w/4.10 gears & Black Hawk Canopy
29.5' Nomad, Superslide Tag Along - 15.5 K, CGVW
EGT, Tranny Temp & Boost Gages, K&N Filters with air mod
Kennedy Intercooler, 3" Downpipe / 4" Cat back exhaust
Kennedy '97 Water pump Mod, w/ Heath Severe Duty Clutch & D-Max fan
4L80E Tranny w/ BD TORQ LOC & Aux tranny cooler with electric fan
Heath TurboMaster @ 12# boost, vacuum pump removed and Heath, Max-E-Tork 2.0 chip
Heath PMD Isolator w/ #7 resistor, -1.94 TDC Offset = 200.8 RWHP It's Done.
" Rock 'n Roll" is here to stay! CREWZIN down the highways...
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Old 08-16-2007, 11:19 PM   #50 (permalink)
jifaire
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Thanks, Wild ... I knew that the BD TorqLok was the best thing since sliced bread for us OBD-I guys, but I haven't been able to find anything except a reflash that works on the OBD-II, and that doesn't let them have manual control.

Oh well. Score one for older trucks!

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