01-15-2015, 04:51 PM
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Member
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Join Date: Jun 2014
Location: SA, TX
Posts: 6,474
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Quote:
Originally Posted by upallnight
As it was pointed out earlier, 4.8 X used a Zf 6Hp26 trans and early 4.4 X used a ZF 5Hp24 trans. If your trans is a 6 spd it is the 6Hp26. If your trans is a 5spd it is the Zf 5Hp25 trans.
If the trans acts normal when it is cold, but has a delay when it is at operating temperature it is probably a fluid pressure issue. As the trans temp increases, the fluid temp also increases and with ATF the higher the temp, the lower the viscosity of the fluid. If there is a leak within the trans the thinner viscosity will not be able to maintain pressure unless the engine is rev which most driver will do if the vehicle is not moving backward. Reving the engine will spin the trans pump faster which in turn will create more fluid pressure which will allow the trans to engage reverse.
Is there a delay from reverse to forward?
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Mine is later 4.4i and uses the 6hp26... will get back to you on the delay going from reverse to forward. Though I know I don't give the truck any gas until reverse engages after the 2-3 seconds. I just wait for it to engage before any gas.
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