No reverse, here are few things you can try before needing to take it to a tranny shop. The 4l60e trans is a fully electronic trans. And being so the problem could be as simle as the reverse shift solenoid has shortted out. Along that same line the reverse valve could be stuck and or the little screen that is attatched to the mid plat could be clogged and in order fix this problemyou need to drop out the valve boby and for the most part rebuild the reverse circute.
Now for the hard stuff. Other problems you could look at.
imput housing assembly - 3-4 apply ring stuck in applied position.
- forward clutch not releasing
- turbine shaft seals missing,cut or damaged.
manual linkage - not adjusted
oil pump assembly - retainer and ball assembly missing or damaged.
- stator shaft seal rings or ring grooves damaged.
- stator shaft sleeve scored or damaged.
- revers boost valve stuck, damaged or misassembled.
- cup plug missing.
- restricted oil passage.
- faces not flat.
- converter clutch apply valve stuck.
valve body assembly - 2-3 shift valve stuck.
- manual linkage not adjusted.
- spacer plate and gaskets incorrect, misposition or damaged.
reverse input clutch - clutch plate worn.
- reverse input houeing and drum assembly cracked at weld.
- clutch plate retaining ring out of groove.
- return spring asembly retaining ring out of groove.
- piston deformed or dished.
- seals cut or damaged.
- retainer and ball assembly not sealing.
- restricted apply passage.
lo and reverse clutch - clutch plates worn.
- clutch plate retaining ring mispositioned.
- porosity in piston.
- seals damaged.
- return spring assembly retaining ring mispositioned.
- restricted apply passage.
case - cover plate gasket missing or damaged.
- cover plate not torgued correctly.
- porosity.
now thhis came from my 4l60 service book.
hope this helps
Thank you for using fixya and be safe
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