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Old 03-27-2010, 07:11 PM
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4L60E slow to engage 1st and reverse

Hi all! Im new to the board and could use some help. I have a 4l60e that I rebuilt with transtar master rebuild kit and transgo hd2 shift kit, and this transmission works exellent EXCEPT I have a delayed engagement of reverse and first after it warms up. I checked line pressure when hot and it is 70 psi in park and neutral, but when i shift into reverse the pressure drops to 50 psi and delay in engagement until it climbs to 70 psi and reverse engages and continues to climb to 120. it basically does the same when you drop it in to OD. first gear has a delay engaging. but if you pick up the idle speed a little and give it more pressure it works perfect. seems to me I need about 75 psi to get the proper gear engagement. Any advice is greatly appreciated!

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Old 04-06-2010, 10:06 PM
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Hi,
Put a line pressure gage (or visit a local Transmission shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, the pump is worn out. If max pressure is low, check Electronic Pressure Control (EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve Easy fix by removing the pan.
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Old 04-07-2010, 06:23 AM
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Quote:
Originally Posted by 72firechicken
Hi all! Im new to the board and could use some help. I have a 4l60e that I rebuilt with transtar master rebuild kit and transgo hd2 shift kit, and this transmission works exellent EXCEPT I have a delayed engagement of reverse and first after it warms up. I checked line pressure when hot and it is 70 psi in park and neutral, but when i shift into reverse the pressure drops to 50 psi and delay in engagement until it climbs to 70 psi and reverse engages and continues to climb to 120. it basically does the same when you drop it in to OD. first gear has a delay engaging. but if you pick up the idle speed a little and give it more pressure it works perfect. seems to me I need about 75 psi to get the proper gear engagement. Any advice is greatly appreciated!

If the pump pressure is that slow to respond , you did not set the pump clearances correctly during the parts replacement.

Pump clearances are too loose. That is why the pressure comes up slow and also responds quicker with more RPM
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Old 07-16-2011, 04:10 AM
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Quote:
Originally Posted by richard stewart 3rd
Hi,
Put a line pressure gage (or visit a local Transmission shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, the pump is worn out. If max pressure is low, check Electronic Pressure Control (EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve Easy fix by removing the pan.
Wow, Damn near identical to what is on

http://www.gmtruckhq.com/?q=node/93

Secondly, put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
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Old 07-17-2011, 11:21 PM
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The .500" is the TV boost Valve. The Low/Reverse boost Valve is .300", can get them up to .400".
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