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  1. 95TwinTT

    1996 Yukon fuel pump is running after vehicle is turned off.

    We're not talking about anything other than taking a flashlight and looking at the wiring harness in the back of the engine. The one that plugs into the oil pressure sensor. See if it is crushed or pinched between the bell housing and the engine. If it has been roughed up, there...
  2. 95TwinTT

    1996 Yukon fuel pump is running after vehicle is turned off.

    The oil pressure sending unit is a variable resistive device for oil pressure, not an on/off switch. The second component of it is, however a switch to + 12 volts. If the oil pressure gauge is pegged, it means it is seeing a full 12 volts, which would be impossible under normal...
  3. 95TwinTT

    1996 Yukon fuel pump is running after vehicle is turned off.

    I’m going to guess that the wiring got pinched and shorted, that connects to the oil pressure sending switch. They have some of the fuel pump circuitry going through the oil pressure sending switch to guard against running the engine without oil pressure. Having just wrestled with the...
  4. 95TwinTT

    Heat before to late!

    The heater hoses can be blocked and it will have no affect on the cooling of the engine. I agree with retorq, must be something blocking or keeping the coolant from flowing through the hoses. Perhaps a vacuum leak or vacuum control problem, that controls the flow valve. Have you checked...
  5. 95TwinTT

    how many miles

    95 with 56K. Runs better than when it was new........
  6. 95TwinTT

    rear trans seal? leaks after lowered

    Lots of variables here, but it should be a repeatable number for the same wheel base and drive train. It might be different between coil springs and leaf springs, because of the pivot points of the suspension being different. It’s kind of a hassle to check. The truck has to be sitting...
  7. 95TwinTT

    rear trans seal? leaks after lowered

    You are correct. Lowering a vehicle is a reason to use them. Any alteration of the drive train geometry should be a reason to check and correct the pinion angle. I think a lot of people ignore the pinion angle issue. They don’t notice the vibrations or attribute those vibrations to...
  8. 95TwinTT

    rear trans seal? leaks after lowered

    By shims are you talking about the “wedges”? I had to use 6 degrees on my Tahoe, when the 4L80 was installed. The geometry was altered by the transmission being 4”closer to the axle. The wedges are offered in “degree’s” or fractions, to adjust the Pinion angle. Imagine a center line...
  9. 95TwinTT

    rear trans seal? leaks after lowered

    The yoke on the driveshaft should have a nice shiny polished end and then a line where it stopped going into the seal. When you lower the truck, the yoke goes further into the transfer case. The part that is not polished, could be rusty or rough enough to quickly wear out the seal. Be...
  10. 95TwinTT

    Got my Mega monster trans installed!!!!

    The firmness of the shift is not just the transmission or the servo’s, but the setting of the “Force Motor Tables” in the ECM. You can make any shift as soft or as hard as you want with pressure. If you know someone that can edit the OBD-2 computer, spend some time on the tranny pressure...
  11. 95TwinTT

    Can someone HELP me with this.. Spark Plug gap??

    I would revisit some of the trouble shooting basic’s. If you all of a sudden have a miss and the only thing that has happened is the plugs were cleaned, I would look very close to see if some other wiring was disturbed. If it happened after changing the dist cap, I would suspect wires in the...
  12. 95TwinTT

    1999 Tahoe Electrical Diagram Needed

    Has the Viper been removed?
  13. 95TwinTT

    LT1 in a 98 hoe

    Thanks, There is no build thread. This Tahoe continues to be “work in progress”. From a couple of different size superchargers, nitrous and then on to the twin turbos. I just keep refining the pile of parts as time goes on. I guess you could call it a hobby. I have always wanted to...
  14. 95TwinTT

    Vortec heads with TBI

    I've seen Tec3's go for half that. Just have to be patient. That one will probably come down a notch or two. It does have the uncut wiring harness that is worth something too. I have a couple of older laptops I use for the Z and the Tahoe. The IBM thinkpad sits vertically in the space...
  15. 95TwinTT

    Vortec heads with TBI

    If you are going to start learning how to tune, it might be worthwhile to check out the electromotive tec3. They are showing up on ebay often. Just to get an idea, download their manual for the Tec3 and check it out. The Tec3 is used on Nelson Racing engines. They are simple to program...
  16. 95TwinTT

    LT1 in a 98 hoe

    Been there done that…. I had the LT1 finished and was ready to drop it in my 95 Tahoe and realized it would limit future mod’s. I yanked the existing engine and turned it into a 4 bolt 383 and have not regretted it. Especially if you are going to go through the trouble of putting a...
  17. 95TwinTT

    Mystery tranny drip.

    Might be the pan gasket. When the truck sits for a few days, the fluid slowly drains back to the pan, from the torque converter and other places in the trans. That increased level in the pan after a few days can encourage the leak. Probably needs a new gasket. That would be a good time...
  18. 95TwinTT

    Weird Voltage Issue

    If you are sure the battery and alternator are OK, You need to get a meter that can measure DC amperage. (Radio Shack has a decent one for $30). Unhook one side of the battery and put the meter between the post and the unhooked cable and see what the amperage draw is, with everything OFF...
  19. 95TwinTT

    Weird Voltage Issue

    Here is a simple test for you guys. If you show 14 volts when idling and the voltage drops when you turn on the heavy amperage items, like headlights, rear window defogger, heater fan, etc. Raising the rpm’s of the engine should help the voltage come up. If the voltage does not come up...
  20. 95TwinTT

    Weird Voltage Issue

    It sounds like your alternator is not able to keep up. I would remove the alternator and take it to a shop that rebuilds starters and alternators and have it tested. They have the equipment to check amperage output at different speeds, etc. Could be the regulator inside the alternator...
  21. 95TwinTT

    Need to know which direction the front driveshaft is oriented for 95 tahoe

    Goes to the rear, against the transfer case.... :)
  22. 95TwinTT

    Going to rebuild trans, what kind of stall should be used?

    There is more to a higher stall than just the space between the stator and the turbine. Technology has come a long ways in getting the most out of a TC. I have a 4,200 rpm stall in my hoe. It acts like a stock TC until I run it up against the “transmission brake”. The TC also has a...
  23. 95TwinTT

    New Member & i hope someone has some other ideas

    I can't imagine how a torque converter could cause your problem. What did Justin suggest?
  24. 95TwinTT

    Thinking of parting out the hoe :/

    Great idea. I find that working on the F-Body makes me appreciate the Tahoe even more. Just replaced spark plugs on the Camaro and it took over 8 hours to change them out. At least on the Tahoe I can see the plugs without a mirror. lol There is a little trick to breaking loose some...
  25. 95TwinTT

    Thinking of parting out the hoe :/

    Come on Adam, you have one of the nicest looking rides on the forum. You have a lot of time and effort in this truck. Reality is, you are one of the very few that really think about rust on the bottom. No one really expects a daily driver to be squeaky clean. I’m sure you have the skills...

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