Transmission Problems.

jat4372 · 26th April 2009, 01:08 AM

Just built my transmission in my 94 auto supra. I sent out the valve body but did the rebuild on the transmission myself.(This could be the problem) I put back together just the way it come out. Just replaced the clutches and sprag and o-rings and the other stuff that comes in the kit. And also put a 3800 stall in there to. When i start the car it automaticly goes into first gear and stays in first no matter weather the shifter is in park netural or reverse. It is always in first gear after it starts running. When I shut the car off the car will go into park, and hold. Go into netural and move back and forth. When you start the car boom it goes into drive.

I think that is something in the valve body sending fluid to the first gear clutches. But what get me is you would think that when the car is put into reverse it would like line lock, but it does not. Its in drive all the time.

Any suggestions.

ward1955 · 26th April 2009, 07:51 AM

Firstly, I'd question weather the lever position sensor is reading correctly ? - it shouldn't start when in gear !

dunk shaw · 26th April 2009, 07:56 AM

Yeh thats a bit worrying, either back track over what youve done or get gearbox specialist to have a look

jat4372 · 26th April 2009, 02:22 PM

The lever position should be in the right position because when the car is off it goes into park and holds, then switch into netural and it rolls. But that is only my thought. Something has to be sending fluid pressure to first gear all the time no matter what.

I also thought maybe the AEM went into a default and did that. So I disconnected the battery, drained the power and reconnected and it is still doing the same thing.

jat4372 · 26th April 2009, 08:27 PM

I think I have figured it out guys. I went back through the book and I seen a spot I did not really did not see before. (very critical part). I dont think the shifter linkage is touching the valve body. Which make since why no matter what gear the shifter is in it is not moveing the valve in the valve body .

Going to find out in the morning. Going to drop the pan and hopefully fix the problem. Pray for me. LOL.

Kev.O · 26th April 2009, 10:04 PM

Best of luck matey.

jat4372 · 28th April 2009, 02:04 PM

That was it guys. The plunger was not hooked up to the lever inside the transmission. When I went through the gears it stuck the plunger in low gear and would not move out of low gear.

Thanks for all the help.

Barney · 28th April 2009, 02:26 PM

Phew.....glad you got it sorted fella.

jat4372 · 1st May 2009, 02:47 PM

Guys I went and had car tune and ran 430hp on pump, and they did not do torque reading at about 18psi. Then tune on race fuel at 26psi and made 493hp and 386foot pounds of torque.

I was not really happy with the numbers but it is safe.

And best of all the transmission I built held with no clutch smell after any of the runs.

ward1955 · 1st May 2009, 04:19 PM

Well done that man !

26th April 2009, 01:08 AM	#1
jat4372 Member Single Turbo - Auto Join Date: Aug 2007 Location: US Kentucky Posts: 114	Transmission Problems. Just built my transmission in my 94 auto supra. I sent out the valve body but did the rebuild on the transmission myself.(This could be the problem) I put back together just the way it come out. Just replaced the clutches and sprag and o-rings and the other stuff that comes in the kit. And also put a 3800 stall in there to. When i start the car it automaticly goes into first gear and stays in first no matter weather the shifter is in park netural or reverse. It is always in first gear after it starts running. When I shut the car off the car will go into park, and hold. Go into netural and move back and forth. When you start the car boom it goes into drive. I think that is something in the valve body sending fluid to the first gear clutches. But what get me is you would think that when the car is put into reverse it would like line lock, but it does not. Its in drive all the time. Any suggestions.

26th April 2009, 07:56 AM	#3
dunk shaw Old Timer None - Don't currently own a MKIV Supra. Join Date: Jan 2005 Location: west mids Posts: 4,196	Yeh thats a bit worrying, either back track over what youve done or get gearbox specialist to have a look __________________ dunk

26th April 2009, 10:04 PM	#6
Kev.O Officially NOT in Wales! UK Spec - Manual Join Date: Oct 2005 Location: Bristol Posts: 4,130	Best of luck matey. __________________ Kev To be single is to be skint

28th April 2009, 02:26 PM	#8
Barney MSOC on winner's podium UK Spec - Auto Join Date: Sep 2004 Location: Wiltshire. UK Posts: 3,586	Phew.....glad you got it sorted fella. __________________ Barney (A Timex watch in a digital age) Lexus Royal Sapphire Blue 94UKMKIVTT Auto + Bits + Chris Wilson magic! PEOPLE SHOULD NOT BE AFRAID OF THEIR GOVERNMENTS. GOVERNMENTS SHOULD BE AFRAID OF THEIR PEOPLE

26th April 2009, 07:51 AM	#2
ward1955 Old Git Jap Spec SZ - Auto (NA) Join Date: Oct 2006 Location: Droitwich Spa Posts: 359	Firstly, I'd question weather the lever position sensor is reading correctly ? - it shouldn't start when in gear !

26th April 2009, 02:22 PM	#4
jat4372 Member Single Turbo - Auto Join Date: Aug 2007 Location: US Kentucky Posts: 114	The lever position should be in the right position because when the car is off it goes into park and holds, then switch into netural and it rolls. But that is only my thought. Something has to be sending fluid pressure to first gear all the time no matter what. I also thought maybe the AEM went into a default and did that. So I disconnected the battery, drained the power and reconnected and it is still doing the same thing.

26th April 2009, 08:27 PM	#5
jat4372 Member Single Turbo - Auto Join Date: Aug 2007 Location: US Kentucky Posts: 114	I think I have figured it out guys. I went back through the book and I seen a spot I did not really did not see before. (very critical part). I dont think the shifter linkage is touching the valve body. Which make since why no matter what gear the shifter is in it is not moveing the valve in the valve body . Going to find out in the morning. Going to drop the pan and hopefully fix the problem. Pray for me. LOL.

28th April 2009, 02:04 PM	#7
jat4372 Member Single Turbo - Auto Join Date: Aug 2007 Location: US Kentucky Posts: 114	That was it guys. The plunger was not hooked up to the lever inside the transmission. When I went through the gears it stuck the plunger in low gear and would not move out of low gear. Thanks for all the help.

1st May 2009, 02:47 PM	#9
jat4372 Member Single Turbo - Auto Join Date: Aug 2007 Location: US Kentucky Posts: 114	Guys I went and had car tune and ran 430hp on pump, and they did not do torque reading at about 18psi. Then tune on race fuel at 26psi and made 493hp and 386foot pounds of torque. I was not really happy with the numbers but it is safe. And best of all the transmission I built held with no clutch smell after any of the runs.

1st May 2009, 04:19 PM	#10
ward1955 Old Git Jap Spec SZ - Auto (NA) Join Date: Oct 2006 Location: Droitwich Spa Posts: 359	Well done that man !

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