TRNW-2: 8L90 Valve Body Interchange

[Rondle David]

I would just do a Transgo kit in it, you use the same reamer for the 6T40/70/ 6F35. Also ream out the pulse dampers. I've done a hand full of the 8L90 valve bodies with great results, I had no choice because they weren't available at the time.

Rondle David
RPM Transmission
406 C Belvue Rd
Travelers Rest SC 29690
864-553-9493
www.rpmtransmissionupstate.com<http://www.rpmtransmissionupstate.com>

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From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of tucker tuckertrans.com via trnw2 <trnw2 at trnw.net>
Sent: Tuesday, April 15, 2025 6:56 PM
To: Technical Discussion Forum <trnw2 at trnw.net>
Subject: TRNW-2: 8L90 Valve Body Interchange

Group,

I have about 5 new 8L90 valve bodies in stock (GM).  The current one I need 2021 Express 2500 with a 4.3 liter engine I don't have it.  It is suppose to take 19435580/24065873.  The valve body is worn out all over AFL, Acc , etc and a solenoid circuit code.  So what I am wondering if anyone has tried install say a 2019 up valve body that wasn't the exact part number GM recommends?  Is there some sort of way to decide if you can interchange them?  I don't know it might not even take the programming if it isn't correct.  Any ideas?

Dan Tucker
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