Hoosierlong90
OBS Enthusiast
Truck is 94 K1500
New L31 tbi injected
Rebuilt 4l60e transmission
Trans flares 200-500rpm under moderate-heavy throttle.
Things done during build
Check dipstick orientation
Transmission fluid is perfectly full
Changed ecm
Changed TPS and adjust accurately
I have went through 2 rebuilds already over the last 6 years. Truck has 37s with 4.88s. First trans, 4th gear went out. 2nd trans, planet broke. Both had Corvette servos.
This problem doesn't always happen either. For example- yesterday, first 3 shifts from 2nd to 3rd where perfect. Then the next 4 flared. From tuner pro, selonoid B looks to be turned off by the computer fine. I went ahead and replaced the computer to make sure.
PSI guage reads between 80-90 through gears 1-4. 100 cruising at 70. Reverse is 125ish. Haven't checked it at WOT because I don't want to burn the clutchs up. When I blip the throttle, PSI maxes out between 200-220.
Can someone please point me in the right direction of what this could be. It feels like a timing issue but it doesn't always happen, so I'm stumped. Could it be a faulty selonoid. And I know it's hard to pinpoint the problem without looking at it. I would take it back to the place that built it but he's almost 5 hours away so that would be 2 10 hour trips to go drop it off then pick it back up. FML
New L31 tbi injected
Rebuilt 4l60e transmission
Trans flares 200-500rpm under moderate-heavy throttle.
Things done during build
- Sonnax smart shell kit
- Sonnax performance pack
- Sonnax heavy duty 3-4 clutch backing plate kit
- Vacuum tested valve body with Sonnax updates
- FLT blue printed performance pump
- New reverse input drum
- Extra wide 2-4 band (Red)
- B/W hi-energy 3-4 clutch pack
- B/W 29 element input sprag
- 4L65E low roller clutch
- 4L70E .63 ratio 2nd gear servo kit
- New torrington bearings
- New solenoids
- New manifold pressure switch
- New spacer plate
- New internal wiring harness
- New seals & gaskets
Check dipstick orientation
Transmission fluid is perfectly full
Changed ecm
Changed TPS and adjust accurately
I have went through 2 rebuilds already over the last 6 years. Truck has 37s with 4.88s. First trans, 4th gear went out. 2nd trans, planet broke. Both had Corvette servos.
This problem doesn't always happen either. For example- yesterday, first 3 shifts from 2nd to 3rd where perfect. Then the next 4 flared. From tuner pro, selonoid B looks to be turned off by the computer fine. I went ahead and replaced the computer to make sure.
PSI guage reads between 80-90 through gears 1-4. 100 cruising at 70. Reverse is 125ish. Haven't checked it at WOT because I don't want to burn the clutchs up. When I blip the throttle, PSI maxes out between 200-220.
Can someone please point me in the right direction of what this could be. It feels like a timing issue but it doesn't always happen, so I'm stumped. Could it be a faulty selonoid. And I know it's hard to pinpoint the problem without looking at it. I would take it back to the place that built it but he's almost 5 hours away so that would be 2 10 hour trips to go drop it off then pick it back up. FML