After being with out my tahoe for 3 weeks I finely brought the 4l60e in to get built by a shop.. i installed it tonight.. the drive home was a disappointment to say the least.

I installed sonnax hp-4l60e-01 shift improvement kit
I bought the "corvette " servo and the sonnax 4th gear servo and they installed that.

The transmission doesn't shift like it should..it shifts but it seems sluggish . It doesn't shift like a shift kit was installed.

there isn't overdrive . Driving 65 with cruz on the tack is showing around 2700,2800. In OD,Before it was around 2000 at that speed.. I manually down shifted to drive and the tack maybe moves 100-300 rpm higher... shifting back to OD and the tack lowers the same.. 100-300 rpms

I spoke with the shop owner ..and Saturday i plan on bringing the tahoe to them to check it out
.. i would like to get some opinions before though.

Would the 2-4 servos cause these issues if it wasn't checked for the correct amout of movement?.. or if the spacer washer didn't get install? I reused the pin that was already in the tranny.
I appreciate your help

 

One other thing to add. I was gonna use a 4l60e from a 05 but discover it was bad. Since i installed the sonnax kit in the 05 valve body and the casting numbers are the same between the 2 (4216995) i swap for the 05 VB and separator plate.. was that stupid and possibly causing these issues?

 

I checked the fluid level and seen it was a little over filled. After i siphon some out i went for a drive and noticed it shifts alot better then prior. Still don't have OD.. but it did go into od for a moment but went back into drive.

So Is the 4th gear servo responsible for all of 4th gear operation?.. i had them install the sonnax 4the gear super hold dual servo #77767K

 

Crazy, wish I knew enough to help. Hang in there. Someone will chime in soon hop.

 

Thanks tgui

 

With the overdrive 4th servo, I would suspect incorrect installation or the servo pin length wasn't checked. I have seen some of the after market 4th gear servos causing no 4th. If you have second gear and third, 4th shold work,it just adds a band.

 

You can measure your servo travel by pushing in the center of the outer servo cover, measure how much it goes in. Put a pry bar between the body and cover. A properly installed/set up servos will have about a sixteenth to an eighth inch of travel.

 

You sure your missing 4th gear? Sounds like lockup is not working

 

The 100-300 rpm difference sounds like going into lockup in 3rd.... Did you open up the 4th feed hole in the separator plate, and to what? What is the clearance set to on the 3-4 clutch?

 

Magabuddys As for The 4th gear adjustment this is what i to am wondering.. the shop that rebuilt it claim they checked it And i asked if the washer that goes on the e-clip was installed.. they also claim it is. I should of went with my guy feeling and slide under the tahoe and checked travel before dropping it off with them.
Wolftrk99, i followed the directions and drilled using the supplied .093 (#42) bit... but i now am second guessing myself and wonder if i missed it.the directions are a bit vague..to me. I assumed the 3 included drill bit was all i needed to complete the installation.. Stupid question..but Would that make that much of a difference if i didn't drill it out or wrong size?