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1983 Scrambler "STUMP JUMPER". Frame off, 5.3 Conversion.

Randyzzz said:
Dennis- will your WIFI diag check for speed sensor signal? Might be somewhere to start. In high range the VSS signal is the same if it's in the tailhousing or in the adapter. It's only only in low range that things get weird. With the sensor in your position (Stock), you just need to tell the computer when you're in low range- there should be a wire that gets grounded IIRC. Hopefully there was a tone ring installed on the JB output shaft...

Imagine that- a new part that's bad. Glad the overheating was that easy to figure out.
Click to expand...

The VSS is something that I am definitely looking at right now. In fact thanks to a long conversation with brother mysunshine I am now convinced to move the VSS to the Transmission using the Advanced Adapters kit were it should be in the first place. I have checked codes using two scanners and no trouble codes pop up. I'm a little baffled but I've been that way most of my life so I will just think about it a couple days and I'm sure if I can come up with the solution or one of you will like always.

PS. The VSS must be sending a signal because the electronic speedometer is working. ?????
 
Thought you Had Speedhut gauges with a GPS speedo. If it was running on the GPS the speed sensor signal wouldn't be needed, therefor not missed. Should set a DTC however.

I have never really understood the logic of the VSS in the TC adapter. If that's where it was best the factory would have put it there. Putting it in the adapter just eliminates the need to inform the ECM when you're in 4Low. I agree, it would not work with a 4-1 case, but with a stock 2.7-1 GM case the tailhousing should work perfectly. Mine is in the adapter. Works great in 4HI, but all sorts of weird shifting in 4LO and the speedo is way off...

Am I wrong? If I am, please let me know.
 
I do have Speedhut but I currently have the electric sensor hooked up and just haven't got around to installing the GPS. Since the speedo is working I'm assuming the VSS is sending a signal. I agree it shouldn't make any difference at this point if the VSS is in the tail piece or the adapter. What I don't understand is why I am not seeing a DTC code. I bet it turns out to be as much operator error as equipment error in the end. I'm probably do something wrong on my scanner and just missing the code. But you know me, I won't quit.
 
At least you are revving and shifting going nowhere, while the t-case is in neutral. ;).

Good luck. You are onto a part of your project where all I hear is the teacher from The Peanuts cartoons.
 
I just thought of another thing to look at. Make sure that your shifter ranging is correct and not allowing it to be between two gear shift detents at the transmission.

Sent from my SM-G920V
 
mysunnshine said:
I just thought of another thing to look at. Make sure that your shifter ranging is correct and not allowing it to be between two gear shift detents at the transmission.

Sent from my SM-G920V
Click to expand...
A very good point that I will check out. I am also questioning if I may have the wrong VSS. When I installed the JB Conversions SYE the VSS bushing was a totally different size one than the one Painless recommended with their harness. So I went with the one from JB instead of Painless. At Least now I have a starting point.
 
I always check thermostats in boiling water before i put them in. I have not putva lot in as i am notva mechanic by trade but have had 1 new one that tested bad in the kitchen (when the other half is not in the kitchen[emoji2] )

Sent from my SM-J320P
 
Back to my shifting problems, this may or may not have something to do with it.
I installed a 241C transfer case of which the VSS has different threads and a different pigtail than the VSS that Painless Performance recommends using with their Harness. I am using the VSS that physically fits the 241C. Since the 241C was as for as I know never meant to be used with this set up could it be that the two speed sensors send completely different signals and this is causing my trouble? I am going to see if I can find the part number for the VSS that I used on my conversion.
 
Then the two sensors are both magnetic which is what you need. Just ensure the spacing from the reluctant and the tooth count is correct.

Sent from my SM-G920V
 
I know I have a 40 tooth wheel and the sensor is screwed all the way down but I guess I could double check it with a depth gauge just to be sure.
 
Tried something else today. I unplugged the VSS and took a test run just to see and the truck acts the same except that the speedo doesn't work. Plug the VSS back in and the only difference is the speedo works. Appears to me that the truck is in Limp mode either way, if I put it in drive I believe it is shifting to second gear, If I manually shift I can go from 1st gear to 2nd gear.
The CEL is still not coming on and I am still not seeing any codes on my scanner. It looks to me like I am having a communications problem somewhere. I'm not beyond bringing it to someone who has the proper equipment to check all the systems out properly.
 
At what speed (mph) will it automatically shift from 1st to second?

With a scan tool/phone app hooked up, are you getting a mph reading from the VSS that matches up to the actual vehicle speed?

If you put the t-case in low range, will the transmission automatically shift up into 3rd and 4th gears?
 
It does not shift automatically, I have to manually shift it. I'm not fooling with it right now. I am going to work on a few other things that need attention for now. I am probably going to bring it to a transmission shop and have the whole system checked out.
 
I talked to a much respected local transmission shop owner today and he has agreed to come to my shop and take a look at Stump Jumper early next week. He also thinks it is electrical and maybe not getting power. In the meantime I was going to go ahead and replace my two piece rear axles and tore everything down only to find that it looks like I have the powertrax limited slip rear end with the DD code. I'm not even sure if I can get one pc axles for this. It's always something. Cha-ching.
 
After looking at your pics, you need some of these gates hoses-

28472 is the 5/8" hose

a50adbb6f94ef60de7292f5b522a6351-1.jpg


Sent from my SM-G920V
 
I used two of those hoses for my 5.3 install, s 5/8 and a 3/4.
 
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