Ok so I just installed a sonnax hp-4l60e-01 along with a Vette servo and a transgo separator plate. Buttoned it off and topped the fluids off. Backing out and driving it you could tell the shifts were firmer. I let it warm up so I can check the fluids and go to back it out and nothing. No reverse. You don’t even feel the trans grabbing reverse it’s like it’s in neutral. In D you can feel it grab. What did I do?

So you think just drop the pan and recheck electrical connectors? Any idea which one for reverse?

I remember the plate on the valve body with 3 bolts. That’s the forward accumulator correct? I did the Pinless from sonnax and tightened the bolts down. Maybe it’s in wrong?

Ok so I’m praying this is it. I dropped the pan and noticed the boost valve was down and the clip apparently didn’t seat. Could this cause no reverse?

I remember tightening 53 down. Prob put it up and down 5 times lol. So the boost valve has two slots for the c clip. I put it in the first one and was amazed how easy it went in.... well after pushing the piston in I noticed another farther in the bore... now I remember when I pulled it out that it was a good was in there... gotta button it up and top the fluid back off and see what she does. Trans is a year old so I would hate to replace it

Reverse works! Gonna run and get some fluid and top it off then test her out

No worries I love this forum and the people willing to help. Just topped it off and it shifts perfect! Runs outa breath at 5k so sounds like I need to cam it lol

Well now I have another issue. The sonnax servo cover o-ring was a smaller gauge then the stock one. I get to work this morning and I can smell the trans fluid burning off my exhaust so sure enough it’s dripoing from the cover. I can’t get under there enough to inspect it until I get it back home. Could it just be that it’s the wrong o-ring? Praying the snap ring didn’t come loose but the trans is shifting fine in all gears. 2002 Escalade lq9. Dynatech long tubes. Either a BTR Stage 2/3 truck or I found a fti streetsweeper tq 220/224 lsa 111 that I might grab local.

Just spoke to sonnax and they said that they don’t supply a servo cover o-ring so what I have installed is def not correct. I’ve done a half dozen of these servos but my first shift kit with it. You always have to cut the o-ring to get it out so kinda sucks they don’t provide one in the kit. Just internal seals for the servo. Gonna baby it to a trans store and pick up a new o-ring and head home to see if this fixes it...