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Old Aug 2, 2024 | 01:09 PM
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Hey guys. I creep on here from time to time and I’m stumped today.
have a 2003 5.3/4l60e 4x4

It’s all hooked up torque converter spacing measured around 3/16. VSS is hooked up np241C.
truck will only move in manual 1st (L1) or Reverse. sitting in the driveway and placing it in OD allows it to roll back like it’s in N.
Fluid level looks good.
It was a recently rebuilt trans that besides that I don’t have much info on.
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Old Aug 2, 2024 | 02:12 PM
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What are the pressures at the service port on the side of the transmission? Does it have any DTC codes?

Rick
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Old Aug 2, 2024 | 03:17 PM
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If you Up-Shift into Second-Gear from Manual First, does it Shift into Second-Gear?
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Old Aug 2, 2024 | 06:51 PM
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Ok so in all gears R, N OD, M1 I have about 60 at idle then jumps to like 210 when I blip it for line pressure.
I see no codes.


but I do see 1-2 and 2-3 are both on?
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Old Aug 2, 2024 | 06:53 PM
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Originally Posted by vorteciroc
If you Up-Shift into Second-Gear from Manual First, does it Shift into Second-Gear?
when I tried this it went to no poooour
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Old Aug 2, 2024 | 07:31 PM
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Vss wires were cut by by PO. Could these have touched and popped a fuse?
im not sure if they provide high enough current to actually do that and with no code maybe I’m grasping at straws. I’ll check and see if the VSS is actually sending info to the PCM.
I forgot to click that when I was running the data
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Old Aug 2, 2024 | 07:42 PM
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Vss is working… dang it

so it’s taking off in 2nd when placed in what I assumed was L1
but it’s in a 2000xj. Will not manual shift into 3rd from there.
when placed in D it goes into 1st gear but doesn’t move.

1-2 solenoid turns off when placed into L1 giving me second gear.

Last edited by Marcus Cobley; Aug 2, 2024 at 07:57 PM.
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Old Aug 2, 2024 | 09:04 PM
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Ok wont move in upper gears position but will in manual low one but stop when upshifted to 2, I would guess the input sprag is in backwards, The overun clutch is on in manual 1 but goes off in manual 2 , It does come back on in d3 3rd but I doubt you are getting to there.
With the sprag backwards or some forward clutch issue You can move in manual 1, not 2, You can move in d3 but only if 3rd is commanded and no movement in D4 . Reverse would be normal
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Old Aug 2, 2024 | 09:35 PM
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Originally Posted by FranksCustomTrans
Ok wont move in upper gears position but will in manual low one but stop when upshifted to 2, I would guess the input sprag is in backwards, The overun clutch is on in manual 1 but goes off in manual 2 , It does come back on in d3 3rd but I doubt you are getting to there.
With the sprag backwards or some forward clutch issue You can move in manual 1, not 2, You can move in d3 but only if 3rd is commanded and no movement in D4 . Reverse would be normal
I was wrong
the XJ actually doesn’t have a m1. That is my fault. So I’m guessing I’m only getting to m2.
does this sound like it’s still the input sprag?
this was kinda my fear.
also this is a generic photo not the actual car I am working with.


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Old Aug 3, 2024 | 09:59 AM
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Originally Posted by Marcus Cobley
I was wrong
the XJ actually doesn’t have a m1. That is my fault. So I’m guessing I’m only getting to m2.
does this sound like it’s still the input sprag?
this was kinda my fear.
also this is a generic photo not the actual car I am working with.

No that would confuse things a bit, The OVERUN CLUTCH is not holding in M2 . But this could point to the low roller, If this is a built trans? possibly if it has a sonnax race/shell the race could be upside down. I say this cause I think you said it is commanding 1st in D3 AND D4 POSITIONS , However some PCM do command 2nd in M2 . The low roller serves no function in 2nd gear. Now if you could access M1 which I suppose you could from under vehicle and try and it moved this could verify ,
But here is the real thing and what we do know. The problem is not electrical or external. The issue is an internal fault and can be best serviced / discovered / fix by going into the trans and should be pretty obvious once in their, IMO you are spinning wheels well actually not pun trying to determine this type issue externally. It is going to have to come back out. Its that simple, Sorry .
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Old Aug 3, 2024 | 10:13 AM
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Originally Posted by FranksCustomTrans
No that would confuse things a bit, The OVERUN CLUTCH is not holding in M2 . But this could point to the low roller, If this is a built trans? possibly if it has a sonnax race/shell the race could be upside down. I say this cause I think you said it is commanding 1st in D3 AND D4 POSITIONS , However some PCM do command 2nd in M2 . The low roller serves no function in 2nd gear. Now if you could access M1 which I suppose you could from under vehicle and try and it moved this could verify ,
But here is the real thing and what we do know. The problem is not electrical or external. The issue is an internal fault and can be best serviced / discovered / fix by going into the trans and should be pretty obvious once in their, IMO you are spinning wheels well actually not pun trying to determine this type issue externally. It is going to have to come back out. Its that simple, Sorry .

always love a good pun!
I do appreciate the help sir.
thank you and everyone who took the time to help !
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