Transmission converter issues .
Transmission converter issues . I just had my stock 4l60e rebuilt . Very mild transgo shift kit and reybestos hd clutches . Along with a used yank ss4000 stall from a local member .
Got everything put together and went for a ride . Transmission will not down shift when in OD seems like its slips and won't go from 1-2-3-4 . Can only manually shift from 1-2 and then it will just free rev .
Trans literally has 5 miles , converter unkown miles but was said to be in perfect condition . I switched to 3 different ecu the stock a4 a tuned 6 speed ( from my th400) and another stock mail order 6 speed ecu .
They acted the same and trans wouldn't shift . Only from 1-2 and manually .
What the hell is going on ? Is the converter bad ( seller swore up and down that it was in perfect condition ) or is the transmission no good ?
Could it be something electronic or do I have the worst luck .
Maybe the shift kit ?
Bought the car a 1999 z28 with a bad transmission and a "good" transmission in the trunk . Installed the new trans with the yank and it wouldn't shift into OD .
Ready to roll this thing off a cliff .
How common is it for converter to go bad ?
Thans has a year warranty but want to make sure it's a transmission issue first .
Help needed . Thanks !
Got everything put together and went for a ride . Transmission will not down shift when in OD seems like its slips and won't go from 1-2-3-4 . Can only manually shift from 1-2 and then it will just free rev .
Trans literally has 5 miles , converter unkown miles but was said to be in perfect condition . I switched to 3 different ecu the stock a4 a tuned 6 speed ( from my th400) and another stock mail order 6 speed ecu .
They acted the same and trans wouldn't shift . Only from 1-2 and manually .
What the hell is going on ? Is the converter bad ( seller swore up and down that it was in perfect condition ) or is the transmission no good ?
Could it be something electronic or do I have the worst luck .
Maybe the shift kit ?
Bought the car a 1999 z28 with a bad transmission and a "good" transmission in the trunk . Installed the new trans with the yank and it wouldn't shift into OD .
Ready to roll this thing off a cliff .
How common is it for converter to go bad ?
Thans has a year warranty but want to make sure it's a transmission issue first .
Help needed . Thanks !
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
++1
I agree it is not the converter.
Your description is a bit confusing. However if your trans will up shift through all gears in [OD], then the internals of your trans should be OK. Since installing the Transgo shift kit (HD2 ?) involves disassembling the valve body a bit, there could have been a mistake there, but that should be relatively easy to fix. (I.e you don't need to remove the trans to fix the valve body.)
Please explain exactly what the car will do and not do in [OD].
1. Will it upshift through all gear?
2. Will it downshift when the car slows down enough?
3. Will it downshift when you give it a lot more throttle?
If the only problem is #3, I would first look at engine sensors (MAF, TPS and MAP) and start by disconnecting the MAF and testing that. I assume you speedometer is working. It would also be good to scan for codes.
I agree it is not the converter.
Your description is a bit confusing. However if your trans will up shift through all gears in [OD], then the internals of your trans should be OK. Since installing the Transgo shift kit (HD2 ?) involves disassembling the valve body a bit, there could have been a mistake there, but that should be relatively easy to fix. (I.e you don't need to remove the trans to fix the valve body.)
Please explain exactly what the car will do and not do in [OD].
1. Will it upshift through all gear?
2. Will it downshift when the car slows down enough?
3. Will it downshift when you give it a lot more throttle?
If the only problem is #3, I would first look at engine sensors (MAF, TPS and MAP) and start by disconnecting the MAF and testing that. I assume you speedometer is working. It would also be good to scan for codes.
The transmission will not shift at all on its own .
If I put it in OD it will run but never shift up seems likes its stuck in 4th gear . It will not down shift either . Feels like driving a underpowered car in a power glide in high gear .
Only kind of shifting I feel is when I manually put in 1st and and up shift to 2nd it will not do it on its own . While in second it will bounce off the rev limiter but never shift . Will not go into 3rd even If I manually try to get it in .
Trans fluid is full and does not smell burnt at all . 1st gear feels good
Motor mad and all sensors are In good order
I originally thought it might be the shift kit but now I'm just stumped .
I bought this car to have fun with it for the summer trow some money in it and sell it later but make sure I'd be able to get back my investment . I have a toddler terminator th400 sitting in my garage I can trow in but in afraid if I do I'll never get what I have into it .
Any other ideas suggestions ? I'll talk to the trans builder this Monday and see what he says .
If I put it in OD it will run but never shift up seems likes its stuck in 4th gear . It will not down shift either . Feels like driving a underpowered car in a power glide in high gear .
Only kind of shifting I feel is when I manually put in 1st and and up shift to 2nd it will not do it on its own . While in second it will bounce off the rev limiter but never shift . Will not go into 3rd even If I manually try to get it in .
Trans fluid is full and does not smell burnt at all . 1st gear feels good
Motor mad and all sensors are In good order
I originally thought it might be the shift kit but now I'm just stumped .
I bought this car to have fun with it for the summer trow some money in it and sell it later but make sure I'd be able to get back my investment . I have a toddler terminator th400 sitting in my garage I can trow in but in afraid if I do I'll never get what I have into it .
Any other ideas suggestions ? I'll talk to the trans builder this Monday and see what he says .
Also the speedometer works . With my stock original 99a4 ecu the speedo works accurately and perfect . With my tuned 01 a4 with a 6 speed tune for my th400 will work but its tuned for 4:11 gears and he speedo will drive a lot faster .
Same thing with the other 6 speed ecu . So the speedo is working all the electronics are plugged in
Same thing with the other 6 speed ecu . So the speedo is working all the electronics are plugged in
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Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Sorry for the delay - I went to our island cottage for the day.
If it feels like it is starting in 4th, then you are in "limp mode" and it is actually starting and staying in 3rd. It won't shift in limp mode.
Limp mode could be caused by something as simple as not hooking up the electrical connector to the trans. Or a defective solenoid, broken wire in the trans or other electrical problem. All of which are easy to fix, once you figure you what it is.
Is your "Check engine light" (MIL) on? As far as I know, there is always a scan code when in Limp mode.
If it feels like it is starting in 4th, then you are in "limp mode" and it is actually starting and staying in 3rd. It won't shift in limp mode.
Limp mode could be caused by something as simple as not hooking up the electrical connector to the trans. Or a defective solenoid, broken wire in the trans or other electrical problem. All of which are easy to fix, once you figure you what it is.
Is your "Check engine light" (MIL) on? As far as I know, there is always a scan code when in Limp mode.
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Verdad Gallardo Thanks for the response and ill check all connectors and electrical and it does feel like its in limp mode .
There is not check engine light on . So I'll double check but if its electrical is it more likely for to be internal electrical or external ?
There is not check engine light on . So I'll double check but if its electrical is it more likely for to be internal electrical or external ?
Took it for along ride today and I was able to get most of the gears to work but never automatically.
Went to the shop had the tech check it with his bad *** snap on reader an somehow the shifter switch is not reading the gears or the ecu is not commanding the shift . When in 1st gear ecu is reading 2nd and so fourth so OD is in 3rd .
Anyone ever heard of this ? Tech tought it might be wiring . We tried 2 different shifter sensors and got the same faulty results .
Good news is trans is good and so is the converter .
Bad news is neither one of us knows what the hell is going on
Anyone ever encounter something of this sort . I'm hours away for dumping the 4l60 and running my rvmb th400 .!
Help if possible
Went to the shop had the tech check it with his bad *** snap on reader an somehow the shifter switch is not reading the gears or the ecu is not commanding the shift . When in 1st gear ecu is reading 2nd and so fourth so OD is in 3rd .
Anyone ever heard of this ? Tech tought it might be wiring . We tried 2 different shifter sensors and got the same faulty results .
Good news is trans is good and so is the converter .
Bad news is neither one of us knows what the hell is going on
Anyone ever encounter something of this sort . I'm hours away for dumping the 4l60 and running my rvmb th400 .!
Help if possible
Staging Lane
Joined: Jun 2013
Posts: 76
Likes: 0
From: Rochester
I had one broken wire at the trans conector. Trans would start in third gear and only drive in third. I had transmission codes, forget what exactly. That snap on scanner may not be able to scan trans codes. Sounds like you are in limp mode for sure. The wire was broken within the insulation.
He was able to check all codes and able to command the transmission to shift .
He was able to get it manually shift from 1-2-3-4
I brought in another shifter assembly and it seem to ony read 2nf gear and nothing else. If its part of the harness would it be the interior harness to the ecu or the actual engine trans harness ?
Any ant way if knowing if its the ecu its self ?
And last is there any difference between a 99 harness and the 01 harness ? Both a4 cars . Have a spare sitting in. The garage and want to make sure they. Are compatible before I try swapping it
He was able to get it manually shift from 1-2-3-4
I brought in another shifter assembly and it seem to ony read 2nf gear and nothing else. If its part of the harness would it be the interior harness to the ecu or the actual engine trans harness ?
Any ant way if knowing if its the ecu its self ?
And last is there any difference between a 99 harness and the 01 harness ? Both a4 cars . Have a spare sitting in. The garage and want to make sure they. Are compatible before I try swapping it
Staging Lane
Joined: Jun 2013
Posts: 76
Likes: 0
From: Rochester
He was able to check all codes and able to command the transmission to shift .
He was able to get it manually shift from 1-2-3-4
I brought in another shifter assembly and it seem to ony read 2nf gear and nothing else. If its part of the harness would it be the interior harness to the ecu or the actual engine trans harness ?
Any ant way if knowing if its the ecu its self ?
And last is there any difference between a 99 harness and the 01 harness ? Both a4 cars . Have a spare sitting in. The garage and want to make sure they. Are compatible before I try swapping it
He was able to get it manually shift from 1-2-3-4
I brought in another shifter assembly and it seem to ony read 2nf gear and nothing else. If its part of the harness would it be the interior harness to the ecu or the actual engine trans harness ?
Any ant way if knowing if its the ecu its self ?
And last is there any difference between a 99 harness and the 01 harness ? Both a4 cars . Have a spare sitting in. The garage and want to make sure they. Are compatible before I try swapping it
Haven't checked if its dirty but its completely in . The the it's the sensor that's in the actual shifter mechanism flat and semi curved .
That's not giving the computer the signal of where the shifter is . It's off by 1 switch .
Is this wiring or a bad computer ?
I'm almost 100% sure my old trans I swapped was good as it was doing the same thing
That's not giving the computer the signal of where the shifter is . It's off by 1 switch .
Is this wiring or a bad computer ?
I'm almost 100% sure my old trans I swapped was good as it was doing the same thing
When a ls1/4l60e combo is swapped into another car does all that wiring also have to be swapped ?
It's very confusing . And don't know if both my shift selector sensors or bad or a bad ecu or wiring ...
It's very confusing . And don't know if both my shift selector sensors or bad or a bad ecu or wiring ...
Had the tech at the shop look it over and they can't figure out what's going on with it
Unless I figures something out today tomorrow I'm pulling it out and putting my trans in it .
If anyone wants a near new yanks ss4000 for $400 pm me .
Shop offered to buy the transmission back in a heart beat as well as my old core .
Unless I figures something out today tomorrow I'm pulling it out and putting my trans in it .
If anyone wants a near new yanks ss4000 for $400 pm me .
Shop offered to buy the transmission back in a heart beat as well as my old core .
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
There might be some confusion here.
The PCM does NOT read the shifter directly - the shifter switches are only for Park/Neutral to let you safely start the car; and Reverse for the backup lights.
The forward positions D1, D2, D3, D4/OD are read ONLY through the pressure manifold switch inside the trans. The manifold switch is bolted to the valve body and easy to replace. We have had some treads of strange problems (e.g. limited shifting) which were solved by replacing this pressure switch. The pressure switch has o-rings, which can leak, or the switch might not be bolted down tight enough. (8 ft/lbs = 96 in/lbs).
The PCM does NOT read the shifter directly - the shifter switches are only for Park/Neutral to let you safely start the car; and Reverse for the backup lights.
The forward positions D1, D2, D3, D4/OD are read ONLY through the pressure manifold switch inside the trans. The manifold switch is bolted to the valve body and easy to replace. We have had some treads of strange problems (e.g. limited shifting) which were solved by replacing this pressure switch. The pressure switch has o-rings, which can leak, or the switch might not be bolted down tight enough. (8 ft/lbs = 96 in/lbs).
