4l60e over drive issue???

[94burban]

Just installed the transmission and now I'm taking it out for a test drive.

This is in a 94 Suburban. I noticed that the rpm's would not drop much once I get going. Example, while driving on i75 at around 65 mph the rpm's were around 2300 to 2400 rpm. When I apply the brakes slightly the rpm's would go increase about 200. Tires size is 265/70/17(i believe) with a 3.42 rear, not sure if this helps.

I did install a transgo hd2 shift kit, not sure if I missed a step. I'm planning on dropping the pan and remove the valvebody. Maybe the valvebody gasket shifted on me when putting it back together. BTW, with the shift kit installed, I thought it would shift faster and a little firmer. At this time, it seems close to stock.

What do you thing I should check out.

Thanks

[txarkitekt]

<div class='quotetop'>QUOTE(94burban &#064; Mar 24 2007, 12&#58;35 AM) [snapback]87167[/snapback]</div>

Just installed the transmission and now I&#39;m taking it out for a test drive.

This is in a 94 Suburban. I noticed that the rpm&#39;s would not drop much once I get going. Example, while driving on i75 at around 65 mph the rpm&#39;s were around 2300 to 2400 rpm. When I apply the brakes slightly the rpm&#39;s would go increase about 200. Tires size is 265/70/17(i believe) with a 3.42 rear, not sure if this helps.

I did install a transgo hd2 shift kit, not sure if I missed a step. I&#39;m planning on dropping the pan and remove the valvebody. Maybe the valvebody gasket shifted on me when putting it back together. BTW, with the shift kit installed, I thought it would shift faster and a little firmer. At this time, it seems close to stock.

What do you thing I should check out.

Thanks
[/b]

Yeah, with a 3.42 and 265/70/17&#39;s, you should not be at 2400 at 65 mph. Do you even feel it shift into 4th (OD)? If not, drop the pan and re-inspect everything. Re-read the instructions to see if you missed a step like you were talking about.

It sounds like it isn&#39;t even shifting into OD...

[94burban]

<div class='quotetop'>QUOTE(txarkitekt &#064; Mar 26 2007, 12&#58;33 PM) [snapback]87324[/snapback]</div>

Yeah, with a 3.42 and 265/70/17&#39;s, you should not be at 2400 at 65 mph. Do you even feel it shift into 4th (OD)? If not, drop the pan and re-inspect everything. Re-read the instructions to see if you missed a step like you were talking about.

It sounds like it isn&#39;t even shifting into OD...
[/b]

My problem was within the valve body, I installed the 3-4 relay valve into the body the wrong way.

Found someone with this same issue on the LS1Tech forum..

Thanks...

[carfreak07]

Your rpm,s are going to jump some when you touch thr brake....this is unlocking your converter...so that part is functioning right. Now about the rpm&#39;s, I have a 275/60/17 and at 63mph I am taching around 1500 in od with 3.42 gears....I dont think you said how fast you were going so maybe you can compare to that....hope this helped

Jarrod