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Old 12-05-2012, 02:26 PM   #11 (permalink)
allsierra123
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Lol well it was worth a try. So basicly even if i used the whole computer it wouldnt have the info on it to shift the trans.

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95 GMC Yukon 2 door
6.5 TD 4L80E, 3:73 Ratio. 286/75/16 tires.
"F" intake. EGR delete. "F" prom chip.
Pmd In the bumper. #9 resistor.
3" DP, 2.25" Crossover. 3" exhaust
Single Thermostat cooling system.Hi flow water pump.
Ac delco clutch and Duramax fan.
S&B air intake system.
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Old 12-05-2012, 04:13 PM   #12 (permalink)
Tannerjpowell
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More than likely there is some difference in the TCM that's keeping it from functioning. I'm not sure how many different transmission / TCM programs there were for 94-95 other than manual and auto, so maybe it was a manual? Or maybe the ECM you pulled had experienced a TCM related failure?

Is the hardware the same for all the 6.5 ECM/TCM 94-95?

Like they said, pull the numbers off of the computer so someone here who is more familiar with it can tell you what application it was intended for. Then you can begin to figure out the rest of of the issue.

If it's not working right now, it MAY work after a reflash. Will have to find someone willing to tinker with that for you.

The TCM definition file is $A1 for TunerCat and is available from them. Software, chip burner (reflash) and other equipment to DIY will run you about $200 total.

Good Luck!!
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1994 2500 Suburban 6.5L - 2wd Auto - 8200 lb brakes - 3.73 posi - 4" Diamond Eye System, 2.25" x-over, PMD relocate and heat sink, Custom LCD readout for EGT, Boost done, working on IAT and EOT. Heath MaxETorq, Turbomaster, Duraterms. In Progress: TransGo HD2, Updated Transmission Solenoids, 2000 model water pump, spin on fan clutch and duramax fan.

2003 ECSB 4x4 6.6L - PPE Hot - MBRP 4" - 1/4 E.T. 14.74 ------- Sold
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Old 12-05-2012, 05:12 PM   #13 (permalink)
allsierra123
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I have been reading up on reflashing DIY


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95 GMC Yukon 2 door
6.5 TD 4L80E, 3:73 Ratio. 286/75/16 tires.
"F" intake. EGR delete. "F" prom chip.
Pmd In the bumper. #9 resistor.
3" DP, 2.25" Crossover. 3" exhaust
Single Thermostat cooling system.Hi flow water pump.
Ac delco clutch and Duramax fan.
S&B air intake system.
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Old 12-06-2012, 12:04 AM   #14 (permalink)
THEFERMANATOR
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Regardless of engine, 94 yuses one ECM, and 95 uses another. The EPROM is what contains all of the info and such to make the engine run and the trans shift as they are actually PCM's(PCM=powertrain control module, or engine and trans).
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Old 12-06-2012, 12:21 AM   #15 (permalink)
bigblazer
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On my blazer i used a late 93 /early 94 block and trans from a 3500 hd.since my tranny was a 93 i had to have the prom custom burned to run it.the 92/93 had a tcm only, 94/95 ecm with prom, prom id must match ecm id.and like i said theres 20 something different id's.96up are totally different.your lucky it even ran.i never tried the whole computer.
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94 Chevy blazer. 929 block, hd 4l80e, pmd relocated in bumper, #9 resister, ssd "80" hp chip, gm8 with DIY boost controller now 18psi, 3 down tube 4" straight pipe 5" tip, k&n cone, optic bump, kennedy injectors, boost/egt/trans/oil pres/water temp gauges, 3 core aluminum radiator w/dual fans, 98 "h.o" w/p with restricters installed, cowl hood. 4.10s in 14b semi floater, 35 firestone m/ts 8" rough country lift 3" body lift. Dos cientos quatro whp As of 2/21/13 thats all she's gonna put out!
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Old 12-06-2012, 12:47 AM   #16 (permalink)
allsierra123
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Yeah it ran dang good too. Pulled like a freight train.

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95 GMC Yukon 2 door
6.5 TD 4L80E, 3:73 Ratio. 286/75/16 tires.
"F" intake. EGR delete. "F" prom chip.
Pmd In the bumper. #9 resistor.
3" DP, 2.25" Crossover. 3" exhaust
Single Thermostat cooling system.Hi flow water pump.
Ac delco clutch and Duramax fan.
S&B air intake system.
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