transmission dropping out of 4th

[Hangtownsvx]

Either 4th is dropping out at 60 to 80 on slight hills or could it be the torque converter un locking? It is only about 500 rpm so I wouldn't think it is dropping a whole gear. How can I trouble shoot the torque converter in the car?

[SVX_MY_BABY]

Sounds like the torque converter unlocking and locking. Pretty normal in my experience.

[Hangtownsvx]

If it is the toque converter, it is doing much more than it used to and I have driven it for more than 200000 miles. What would wear in it? or is there an electrical signal that goes to the torque converter?

[Blacky]

Mine is doing the same thing but right at 80 kph (50 mph). I was thinking maybe the throttle position sensor had something to do with it.

[Hangtownsvx]

I have been reading the big factory manual and the trans computer has some imputs before sending a signal to the duty solenoid B.
Vehicle speed sensors 1 and 2
engine speed
throttle opening
ATF temperature
what gear or range is selected

Also it wants to know if cruise control is in use. I always suspected that lock up stayed engaged more when cruise control was in use. I haven't nailed that down at all.

Fault codes are indicated via the Power light flashing.

[Hangtownsvx]

I am going to get my spare trans rebuilt and use a new torque converter this time. Anyone have a source for a new or rebuilt torque converter?

[TomsSVX]

Sounds like a tps issue. If it's reading a higher tps it will unlock the tc in expectation of heavy throttle input.

On a side note, I put a fwd Impreza trans I put in my fwd svx and I used the Impreza converter. Turns out the converter would lock only once and would later unlock and not lock again until I cycled the ignition. Never figured out why it did that but putting an svx converter in it later fixed it. Not sure on your situation if it's related

Tom

[svxnavyvet]

I picked up one of these . Have not installed it yet. Tom you might take a look at it make sure it is the correct one?
https://www.ebay.com/itm/26275131359..._redirect=true
here is the direct link
https://www.floridatorqueconverters....ter-69-32.html

[Blacky]

Here's a cheaper fix. OEM TPS in no longer available but here's a solution:https://speedyefi.com/product/tps-ad...VvpUpxx-LZfH8U

$75.

[Hangtownsvx]

If the Florida one really is the right one, I am interested. I better call to verify.

[svxnavyvet]

ya Isaac dalton lives in my home town we have talked about the tps he made the conversion so far everyone using it likes it.

Originally Posted by Blacky

Here's a cheaper fix. OEM TPS in no longer available but here's a solution:https://speedyefi.com/product/tps-ad...VvpUpxx-LZfH8U

$75.

[TomsSVX]

Yea no idea if that's going to have the correct stall on that converter but it "should" work. When I had the wrong one in my car it was visibly smaller in girth

Tom