rush phaktor

I'm on here trying to see if anyone has any ideas to help trouble shoot my 4L60e. Its in a 98 TA with bolt ons, 244r cam, 243 heads, 3.73 gears, trans cooler and 3600 yank stall. I just had the transmission rebuilt because the 3-4 went out. I recently put the transmission back in and filled the yank with a quart of nonsynthetic fluid and then put another 9.75 quarts in the trans. I know stock transmission is suppose to be 10.8 quarts (trans, torque convert, lines, ect.) total. Fluid level looks good. After letting the car warm up I took it for a test drive, car has park, neutral reverse and what appears to be first (hard to tell with the stall but feels as it did before the transmission was rebuilt). Car revs up and wont upshift. I tried manual shifting to no luck. Any ideas? I googled and checked forums but as I said the transmission was newly full rebuilt. My friend thinks the car needs to relearn the transmission but previous TA and trans swapped never needed that. Any help is much appreciated.

performabuilt

iTrader: (25)

Can you do a manual 2-3 shift , checking for limp mode in this condition you cannot select manual first but should be able to start in second and **** to 3rd gear driving no fouth or lockup allowed either,.
And no this is not a relearn issue,

rush phaktor

It does not shift 2-3 manually and wont start in 2nd.

rush phaktor

I unplugged and plugged the transmission 2x under the car to ensure connection and checked all fuses also.

mrvedit

It sure sounds like limp mode in which the trans starts and stays in 3rd gear.
Have you scanned for codes?

performabuilt

iTrader: (25)

That is what I was trying to determine by having him unplug the harness and attempt a 2-3 shift manually but I see he says with harness unplugged wont do that, Odd indeed

performabuilt

iTrader: (25)

The car should make a shift manually with harness unplugged 2-3 . But if its still in 1st sounds like a valve body issue did you drill any holes? Check that screens if present are not blocked in shift solenoids?

mrvedit

I still don't understand what gears, if any, can be manually selected with the harness unplugged.
Does [D1] force 1st gear? Or only with some valve bodies and/or VB mod?
How could the OP get into 2nd gear? You imply that a 2->3 shift is possible.

BTW - Great to see you helping out regularly again! We will all learn from your posts.

performabuilt

iTrader: (25)

All 4L60E will do a manual 2-3 shift no power to harness or limp mode, no 1st no 4th but while in drive or OD the trans will start in 3rd gear if lever is in second or first gear position it will start in second,
The exception is with the transgo HD2 which will apply the low roller clutch while leaving the band applied and act like a transbrake,
The fact he does not defalut to 3rd or even have the ability to do the 2-3 manually and remains stuck in 1st even with harness unplugged "simulated limp mode" would point to a valve body issue

And yes gonna try and be in here more thanks

rush phaktor

Sorry I may have misunderstood then. I tried manually shifting with the transmission plugged in only. My friend brought his code reader and the CEL still had all the transmission codes (something like 5 or 6 transmission related), snapshot them and then cleared them. The one that returned was the pressure control solenoid fault or something like that (I forgot to write down the p code before he left).


so now I am leaning toward replacing the solenoid and maybe the others while I'm there. I'm also trying to find out what was replaced when the trans was rebuilt.


I really don't want to drop the transmission again but I don't know if I will have to take the whole transmission so the shop can troubleshoot again.

rush phaktor

Sorry still at it and was busy with work and all. So i changed the PCS solenoid because it threw that code and then it began shifting up to 3rd but no 4th or OD.

I dropped the trans again and had the builder crecheck it. He said everything check out amd he pressurized the valves or whatever. Put it back in, nothing.

Ran a scan and im getting P codes 0740, 0742,0748, 0751, 0756, 0785. These are the ones i believe are trans related.

So could it be the TCC fault causing the others to throw codes or event the internal trans wiring harness?

mrvedit

That many codes suggests the harness is not plugged into the trans or there is something seriously wrong with the external or internal harness.

rush phaktor

I used my check light on the computer harness and about half the pins light up with the key in the foward position. Not sure how many should be firing up without the car running. Transmission guy scanned it and now showing 3-2 solenoid. But different codes come back when cleared. Seems to always be a solenoid though. Thinking electrical but not sure where else to look or what's the best thing to do next.