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  1. Fireball5657

    LS PCM Mount in a TBI Truck?

    Fair point, I figured the casing would line up, but I wanted to be sure. I checked a picture of my transmission the last time it was out, and it does have the 27 spline shaft. Also true, but I specified 88-94 because 1995 trucks have a bracket that holds the larger four-wheel abs controller...
  2. Fireball5657

    LS PCM Mount in a TBI Truck?

    Hey all. I've been toying around with the idea of swapping an LM7 5.3 into my truck, but I'd like to have everything planned out before I go and buy everything. So where is everyone mounting their PCM's in their LS swapped 88-94 truck? In an ideal world, since I plan on sticking with the stock...
  3. Fireball5657

    backlit dash switches?

    On the 88-94 interiors, the only interior controls that are backlit are the gauge cluster and radio controls. The HVAC controls are backlit if the truck has air conditioning and the buttons. If you have the manual (non-AC) levers for the HVAC, then it won't be lit up. Everything else on an '88...
  4. Fireball5657

    Vicious 1-2 Shift on 4L60E.

    Update: New PCM installed, PROM swapped, absolutely nothing changed. Still shifts crazy hard 1-2. I may try testing the EPC solenoid itself next, if it's not that then it must be something deeper in the transmission.
  5. Fireball5657

    Vicious 1-2 Shift on 4L60E.

    Not sure of the part number, the inside spring was green and the outside spring was black. I didn't touch anything else, and I'm not familiar enough with transmissions to tell you about the servo pin.
  6. Fireball5657

    Vicious 1-2 Shift on 4L60E.

    I just wanted to update the thread with some more information I've found. Inside the transmission is an EPC solenoid. From what I've read, it controls the line pressure for the whole transmission. The PCM controls the amperage for this solenoid, as the amperage gets lower, the line pressure...
  7. Fireball5657

    Vicious 1-2 Shift on 4L60E.

    Right, when you drop the accumulator housing, the Sonnax piston is on top, underneath that is the two springs, then the ball bearing from the Sonnax kit sits in the hole where the pin would go. So the piston is pressed up against the transmission body. (separator plate I think it's called?)
  8. Fireball5657

    Vicious 1-2 Shift on 4L60E.

    Interesting, I had no idea that these early 4L60E's had adaptive shift patterns. I don't think the adaptations have ever been changed through the 4 different transmissions this truck has had through its life. That might actually help. Unfortunately I don't even know where to start on OBD1...
  9. Fireball5657

    Vicious 1-2 Shift on 4L60E.

    Hey all, I've got an extremely rough 1-2 shift on my 4L60E and it's making the truck nearly undriveable. The truck is the GMT400 in my sig, it is a 1994 GMC Sierra K1500 with the original TBI 350 and a reman 4L60E. The only code I have is for the EGR valve. The EGR valve hose is disconnected...
  10. Fireball5657

    Reel light location

    My neighbor has a well equipped, all-original 1996 RCSB C1500 that has that reel light in that same spot on the firewall. I've seen a few Vortecs in the junk yard that have lights on the firewall, but not nearly as often as I do on TBI trucks.
  11. Fireball5657

    Can you bleed RWABS with the truck in the air?

    Tomorrow I'll mess with it and see if that really is a bleeder or if it's like what Supercharged111 said. Point taken on the lift bleeding, I doubt it'll hurt anything, but if something goes wrong then I'll screw up not just my truck, but also my lift that's bolted into the concrete. Maybe not...
  12. Fireball5657

    Can you bleed RWABS with the truck in the air?

    I went out to my truck and looked at everything. On the diagram above, part #3 has a rubber cap at the front of it. Under it is something that looks like a bleeder valve; but I'm not sure if you can bleed the ABS that way. Everywhere I see on this forum, people say that you have to use a scanner...
  13. Fireball5657

    Can you bleed RWABS with the truck in the air?

    I was brainstorming how to bleed my new RWABS module on my '94 K1500 w/ JB5's. Of course I could use a scanner, but those are expensive and I don't know anyone nearby who has one; and I could use a gravel road to get my brakes to lock up, but I'd really like to not tear up my brand new tires; so...
  14. Fireball5657

    93 k1500 - Wire “A” 25 Gen?

    Could it be the alternator warning light? Often alternators are referred to as "gen"erators, so maybe that's what it is.
  15. Fireball5657

    How to tell if engine is roller ready?

    Good to know. When this engine comes out, I'd like to rebuild it and make it quite the runner, that's why I'm trying to go with a roller setup. I'd also like to keep the original block if I can, so it's nice to know that I should be able to convert it to a roller block pretty easily. Also some...
  16. Fireball5657

    How to tell if engine is roller ready?

    Perfect, that is exactly what I'm looking for! I'll do the valve cover gaskets, intake manifold gaskets, and rebuild the TBI soon; so I'll check it out then. Thank you!
  17. Fireball5657

    How to tell if engine is roller ready?

    Hey all, I've looked all over trying to find a definitive way to tell if my block has the roller provisions, but I can't seem to get a clear cut answer. Everything I'm finding is contradictory, people mixing up years and engines, so I'd like to check my engine for myself. It's an LO5 TBI 350...
  18. Fireball5657

    Looking for a complete powertrain wiring harness.

    Yeah, I was afraid of that. The thing is that there’s nothing really wrong with the current harness, everything works fine now that I’ve fixed the transmission stuff, but all the clips on the sensors are broken and some of the wires like the CTS on the head and the knock sensor have exposed...
  19. Fireball5657

    Looking for a complete powertrain wiring harness.

    Hey all, I have a 1994 GMC K1500 with the TBI 350 and a 4L60E. I’ve been having wiring issues with the transmission harness since the metal holder for the harness at the bell housing has rubbed through the wire loom and is starting to rub through the wires themselves. I’ve patched the spots...
  20. Fireball5657

    Truck dies when put in gear.

    Hey all, I’ve got a bit of an issue. I’ve got a 1994 GMC K1500 with the TBI 350 and the 4L60E. The truck starts and runs just fine, but the second it’s put into reverse or drive it dies. Now, if I disconnect the trans fuse it’s goes into gear just fine, but the throttle is a little funky. It...
  21. Fireball5657

    88-94 vs. 95-98 Interior Debate

    Oh you do? That's really cool. I've seen 4 in person since I learned about them, definitely not a common package. Is yours a Chevy or GMC? It's interesting because there's no mention of the package on anything other than the Chevrolet order guide. The sales brochures don't mention it, the press...
  22. Fireball5657

    88-94 vs. 95-98 Interior Debate

    The Suburban's could be optioned with it for 1994, I've only ever seen gray and tan ones, but there may be red and blue ones, not 100% sure. The pickups also got them only for 1994 with the ZM2 package. They were all extended cab short beds and it was a rare package advertised as the "Silverado...
  23. Fireball5657

    88-94 vs. 95-98 Interior Debate

    Personally, I love the early interior. My truck is a 1994 with almost every option and it's really a great place to be. Mine has the power cloth bucket seats and I've been on a 8 hour road trip with a few friends and none of us were even a little bit sore. The rear seat passengers weren't very...
  24. Fireball5657

    How to reset TCU on 94' 4L60E?

    Hey all, I recently ordered a new transmission for my truck, and I've been told by shops and trusted friends that as the transmission ages, the TCU adapts to the transmission as it ages and parts start to wear. Because I'm putting a brand new transmission in the truck, I'd like to get the TCU...
  25. Fireball5657

    Who has the best reputation for reman 4L60E’s?

    Hey all, the trans in my 94 K1500 has officially kicked the bucket, after a filter and fluid change it soon gained 5 more neutrals and now I need a new one. I haven’t found a good local shop near me, and I don’t know where to start when it comes to an online trans. So hopefully someone can point...
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