I have a 1995 4x4 with the 46rh and I am having many issues with it.

First off is my transmission. The transmission will upshift into every gear but as soon as i get to highway speeds it can not figure out what gear it should be in and searches for a correct gear. For the most part itll downshift from OD to 3rd or 2nd while going 70mph then quickly try to adjust but will go to the wrong gear again then finally get to OD and if i let off the pedal itll imediatley down shift again. I replaced the TPS thinking this may be the issue but it did not change the sporatic shifting. Im thinking now its either the wiring for the TPS or the TV cable?

Next problem is im almost certain I have a fuel leak in the line but not 100% because it has a sporatic starting issue. Itll start fine sometimes then others itll take a full minute of cranking to finally get it to turn over. This is after periods of 8 hours or more of sitting, but it has also done this when I have turned off the truck for no more than half an hour and then returned and it did not want to start. Could it be anything else? I have looked for obvious fuel leaks but can not find any. What else should I look for? How should I go about locating a leak that is too small to see?

My final problem is my brake lights. I have been told by people who follow behind me that they think im constantly hitting the brakes or holding down the brakes because they are not functioning properly. I have even noticed when exiting the truck that the brake lights are still engaged while no pressure is being put on the pedal. I believe this could also be affecting my transmission shifting issue. Where do i start to figure out this problem? Could this be affecting my tranny shifting issues?

I feel as though I know enough about my truck to diagnose most problems but all these problems happening at once has me pretty stumped. If yall have any ideas or can help point me to helpful info it would help a lot. Thanks.

 

The majority of fuel system leaks don't leak fuel but will suck air.
Easiest way to find leaks to pressurize the tank, 5 psi max, with an air blow gun wrapped in a rag. Have another person go hunting while the other pressurizes.
This may help> http://www.cumminsforum.com/forum/94...m-writeup.html

The brake light switch is probably causing your tranny and lighting problem.
Cruise control probably doesn't work either.
Replace the switch, $11 at Napa.

 

I replaced the brake light switch and that fixed the brake light issue but not the trans issue. So now I have replaced the TPS and brake light switch and the transmission is still having shifting issues. I have not adjusted the TV cable but just by looking at it and watching it while someone else pushes the pedal it seems to be operating properly and does not have slack. So now Im down to the wiring somewhere or the TV cable.

Plus I still havent got to the fuel line leak.

 

About the only things left are wiring, trans temp sender or an internal tranny problem.
Hook up a simple, cheap and easy lockup switch to see if your problem is electrical or mechanical.
Instructions> http://www.tstproducts.com/Torque%20...p%20Switch.pdf

 

I guess I shouldve mentioned that I have a torque converter lockup already. No slippage at all.

 

Unplug the trans temp sender on the driver's side hot line about a foot forward of the tranny. Leave it unplugged and jump a 1000 ohm resistor (25¢ Radio Shack) across the two wires.
If it works right then your sensor needs replacing.

 

Is there a picture of this sensor somewhere so I know what im looking for?

 

For a 95, the sensor is located on the drivers side of the transmission "T"'d into the cooler lines going to the rad.

 

save the $11 and try adjusting the brake switch first.
Remove it - press the pedal down and twist the switch body CC 90*- pull the plunger all the way out until it stops - it will click several times in the process, then reinsert the switch and allow the pedal to come on ON IT'S OWN against the switch. It will depress the plunger as many clicks as needed and be properly adjusted.

you have to do the SAME THING when replacing it with a new one so try adjusting it first, I'll never understand why everyone says replace it when it's a 2 minute job to adjust and fixes the issue 95% or the time.

 

It's the only wires you'll find on the driver's side forward of the tranny.
Very easy to find.

 

Well I have now gone and replaced the TV cable because I noticed that the wire connected to the thorttle was splitting and not allowing the cable to function properly. This helped the truck reach OD and stay in gear for a while longer but it really seems as though the first time i get the truck up to speed and in OD its fine but once I allow the truck to drop below OD and even 3rd the tranny never wants to climb back up into 3rd and OD properly. Just shifts all over the place. I could literaly drive without taking my foot off the pedal for hours and the truck would drive fine but as soon as the trans is allowed to downshift it never shifts correctly again until the truck has been stopped for a while and then driven again.

 

have you checked the fluid? Level, color, smell, etc?
Drain and change... anything in the pan? Might be more mechanical internals...

 

Yea I checked the fluid yesterday. Lookes like it was changed yesterday with no smokey smell at all. I also took the time to replace the trans temp sensor and clean and tighten up all my grounds. Still nothing has worked. I am leaning towards the problem being associated with the pigtail connection at the TPS (voltage regulator plug) or the wiring running from it. Its that or something else I have missed and havent replaced yet but I have replaced and checked almost everything else that has been suggested, besides looking at the internals.
I dont want to give up but i feel as though i have run out of most of my options for fixing it on my own so if i have to i may resort to having a trans shop take a look at it and at least tell me if it is internal or not.

 

I've seen where people say there is a TPS noise issue on a lot of these trucks and simply installing a capacitor from radio shack will fix the issue. I'd have to search for the correct wiring and fahrad cap though.

 

Well I replaced the plug at the TPS and this still did not eliminate my shifting issue. I believe I have replaced almost everything that is electronically related to the transmission to try and solve the problem.

I really don't have an issue with going down the highway and hitting my TC lock up switch and the tranny will preform fine but more the idea that there is not an issue at all with the transmission and that I do not have to use the lock up switch to keep the transmission from downshifting and not being able to get back into the higher gears.

If I have missed anything electronic that may affect the proper function of the transmission lpease let me know because I am open to suggestions before I have a trans shop look at the internals.