4L60E Trans ?

[redhors66]

I started this thread over because I actually have a brand new issue on my 1998 GMC Jimmy 4x4. I recieved my new shift solinoids, removed the pan and replaced them. Easy as pie-- When I pulled the one on the right (passenger side of tranny) out there was really no (spring) presure on it. At least not like the one to the left of it--that is when I noticed it. On one valve there was a rod sticking out that seemed to have some type of spring presure on it but not the other. Is this normal? I would assume so!
So anyhow I installed both solidoids, pluged them in, put the pan back on and added some fluid to normal operating range. Then came the test drive--Now it starts out in third gear unless I manually shift it to 2nd. Before it was going from 1st to third and so forth and now it dont seem to want to find first--only second, third, drive--OD. What the he!!. It is also the same downshifting,downshifts only manually.

So withis being said, the truck only shifts manually both upshifting and downshifting. not automatic!

Is there a fuse, should I disconnect/reconnect the battery, I am at a loss. I will probably pull the pan back off and try to see if there is something amiss. By the way--no codes or service engine light yet. Any positive inputs are welcome please!

[technaut]

Originally Posted by redhors66

I started this thread over because I actually have a brand new issue on my 1998 GMC Jimmy 4x4. I recieved my new shift solinoids, removed the pan and replaced them. Easy as pie-- When I pulled the one on the right (passenger side of tranny) out there was really no (spring) presure on it. At least not like the one to the left of it--that is when I noticed it. On one valve there was a rod sticking out that seemed to have some type of spring presure on it but not the other. Is this normal? I would assume so!
So anyhow I installed both solidoids, pluged them in, put the pan back on and added some fluid to normal operating range. Then came the test drive--Now it starts out in third gear unless I manually shift it to 2nd. Before it was going from 1st to third and so forth and now it dont seem to want to find first--only second, third, drive--OD. What the he!!. It is also the same downshifting,downshifts only manually.

So withis being said, the truck only shifts manually both upshifting and downshifting. not automatic!

Is there a fuse, should I disconnect/reconnect the battery, I am at a loss. I will probably pull the pan back off and try to see if there is something amiss. By the way--no codes or service engine light yet. Any positive inputs are welcome please!

Why did you put in new solenoids?

[Natkins]

this trans has some wireing harness problems too but you need to have the computer scanned if the light is on for the trans.
this is a complicated problem that might need a rebuild if the harness is ok.

[blazes9395]

Try this;

Get under the truck and disconnect the harness from the tranny. Start it up and throw it in gear and go for a drive with the harness disconnected.

This should do two things, 1st it should throw the service Engine Light, and second the tranny should run in failsafe, I think its third gear, it won't shift in any other gear.

Don't drive far like this. If the Service engine light does not come on, you could potentially have a computer problem.

You should go to a trans shop and see if they can put a bi-directional scanner on it, and command shifts with the scanner. If the tranny shifts into all gears with the scanner, you now have ruled out your tranny at this point.