Got a 1995 4L60E that has now been rebuilt that has 2nd gear starts in drive. This transmission has 2nd, 3rd, and 4th gear in drive but will not go into 1st even after trying to downshift from 2nd from drive. Initially this transmission had all manual gears and shifted manually very nicely, after fixing what was thought to be the issue (valve body gaskets were wrong), now it seems to be trying to engage manual 1st and the lo/reverse clutches at the same time. Things checked and confirmed good: Wiring harness, solenoid resistance, separator plate, valve body gaskets, check ball location. Was thinking of swapping valve bodies but only one available at this time is a 1996 valve body, seems after further searching around that this valve body would not be right for the 1995 model. Please let me know your thoughts, greatly appreciate any help.

 

Are you saying the Valve body was once modified for completely manual shifting? If yes, hard to be sure just how much was modified. Maybe start by confirming that the 1-2 shift valve is stock.
Yeah the 1995 is a unique year; you will need a 1995 valve body.

 

So this transmission has been sitting a while and I did the rebuild. I believe the valve body for the 95 is original not modified or at least it does not appear to be modified. I had the 1-2 shift valve out of it and I believe it was an original steel valve, but was swapped for an aluminum one after the first time this transmission was tested. Just curious if you would know why the 96 valve body wouldn't work? It seems the 96 has the same flow and the same valves as the 95, I understand the manual valve is different and an additional exhaust on that part of the casting. Also the change in the 3-2 shift valve, the 95s can be transferred over to the 96 but that 96 casting filled in where the one retainer clip was. If hypothetically a guy were to run this 96 on the 95 would it recommended to keep that 96 valve and spring since it would not use that end cap and retainer clip. Thanks for reaching out appreicate the help.

 

I would try an oversized AFL valve for Central Valve Bodies. Part # 4L60E-AFL. From what I can make out from your description of the problem, it sounds like maybe the AFL valve and bore in the valve body is worn. They are only $19 plus shipping, so not much of a loss if it doesn't solve your problem.

 

You are getting close to understanding the difference between the 1995 and 1996 valve body.
I did an AI search for "valve body differences between 1995 and 1996 4l60e" and it returned:
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The main difference between the 1995 and 1996 GM 4L60E valve bodies is the 3-2 downshift control strategy. In 1995, the 3-2 solenoid was Pulse Width Modulated (PWM), while in 1996, it switched to a standard on/off operation.
Because of the change in control strategy, the solenoids themselves have different electrical properties and physical appearances:

• 3-2 Downshift Solenoid: The 1995 PWM version has a resistance of roughly 9–14 ohms, whereas the 1996 on/off version (often a white plastic solenoid) has a resistance of 20–31 ohms.
• TCC Solenoid: Both years utilize a PWM Torque Converter Clutch (TCC) solenoid (typically gray plastic), but the internal valve train for lockup control may differ slightly between these years.
• Electrical Pins: The 1995 model often features a 13-pin case connector, while 1996 and later models may vary based on specific truck or car applications.
• Internal Valves: The 1995 valve body has a unique 3-2 control strategy valve train. Some early 1995 units feature a bore plug slot for a retainer clip that was removed in late 1995 and is entirely absent in 1996 models.
• Spacer Plates: The separator plate for a 1995 unit is unique due to the dual PWM setup (3-2 and TCC). It typically has two holes above each solenoid location, while non-PWM or different-year setups may only have one.

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Obviously all AI responses have to be taken with a grain of salt, but that seems to match what you noticed.
The AI also points out that using a 1996 VB may result in Limp-Mode because of the difference in resistance of the 3-2 Downshift solenoid.

Maybe Frank or one of the other experts here knows how to make a 1996 VB work and/or confirm Mr Bond's suggestions.

 

I would as mentioned consier the gently oversized AFL valve , Though ussually if that is the issue a slight tilt in on the throttle will bump it down to 1st .

But honestly I a but baffed you say you were able to shift all gears manually , Would it start in 3rd or 4th if you put it in those? The TG HD2 and 3 when used if trans is in limp mode will result in a brake like effect in manual 1

1996 VB can be used in the 95. with the 95 PWM and 3-2 solenoid. but you must use the 96 pllate. with the 96 VB.
Some will say you need to stick the 3-2 regulator valve but I have noted no real difference and in fat my own car is running a 96 vb in this manor and the 95 solenoids no issues with anything, . But as I said you must use the 96 plate with the 96 vb . i suspect if you did indeed have full manual function prior to build that an TG HD3 might have been installed and is partically ,missing now ? Little tiny check ***** that go between valve and solenoid. And note the 1-2 valve stock should not have a hole in the center.

 

It would go into drive and just instantly skip over 1st and start in second, I dont recall the 1-2 shift valve having a hole in the center so that was stock. I threw on this 96 VB and spacer plate, had also airchecked all the clutches and they engaged good hoping this valve body fixes these issues, honestly unsure what it would be if not this valve body.