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Old 10-10-2008, 05:00 PM   #1
SDLAW
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Join Date: Oct 2008
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4L60E no reverse

OK. Before I climb a tower and open fire, I'm hoping somebody can help. I cracked the case on my 94 K1500 so I decided to swap out the parts into a case I had laying around. I decided to rebuild it at the same time. Afterwards, no reverse. I wasn't real upset since I thought I might have been a little rough with the seals in the reverse and input drum as well as the teflon rings on the stator shaft. I didn't replace the teflon rings on the pump or the bushing in the reverse drum either.

So... I pull it out and start over. This time I was very careful with the seals and replaced all the teflon rings and bushing. I didn't disassemble the valve body or pump since I did that the first time. I air tested all the clutches and they seemed to work fine, but once again no reverse. If I shift from neutral to reverse the tires will weakly turn backwards for a short time, but if I rev it up it stops. I swapped the valve bodies and other than getting soaked in oil and really pissed, nothing changed. The only thing I can think of is something in the pump or the case. All the other gears seem to work and shift ok. Any ideas?
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Old 10-11-2008, 01:27 AM   #2
Wally
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You reckon there is high pressure fluid getting to the reverse apply cct? How about the reverse boost valve fitted correctly, O ring on filter, reverse piston/check ball, seal leak .... somethiong that is either blocking flow to the reverse drum, or more likely relieving pressure from the reverse drum cct.
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