[robert.lopez.031994]

From the error code P1870. Had noticed that it goes to OD when being 4th gear around 45+ mph. From reading the forums around. People tend to buy a valve kit and that’s what I done today. From taking off the transmission pan. Was surprised that it was less than 4 quarts that it was able to switch gears. Had replaced the valve that people said. Put new transmission filter and gasket. Along with 5 quarts of transmission fluid dexron 3. Have park and drive. But, no reverse. Not sure what is going on or what could be the culprit for no reverse? Or was it from doing the valve kit that caused no reverse ?

 

[Tranzman]

Did you replace VB gaskets? reverse is a manual valve only gear selection. No electronics play any part in reverse. It almost has to be a leak to the reverse circuit. There are different length VB bolts wron bolt in a hole binds the gear train. Because you have forward, I don't think thats the case. You should see if they are correct though.
Page 7 of the SK instructions I attached give you the length & location.

 

[robert.lopez.031994]

@Tranzman got this question. What would happen if bolt C that are 9 of them. Only 8 were installed back. Would there be negative effects to the transmission? Had accidentally missed one without realizing it until finding one bolt from taking this beauty out of the garage with gears working now because of your wisdom and sharing knowledge. Thank you.

Needed new VB gasket

 

[PeteD]

@Tranzman got this question. What would happen if bolt C that are 9 of them. Only 8 were installed back. Would there be negative effects to the transmission? Had accidentally missed one without realizing it until finding one bolt from taking this beauty out of the garage with gears working now because of your wisdom and sharing knowledge. Thank you.

Needed new VB gasket

Devil's in the details.
Correct bolt in correct location , correctly torqued, is a must for correct auto trans function.

 

[Tranzman]

@Tranzman got this question. What would happen if bolt C that are 9 of them. Only 8 were installed back. Would there be negative effects to the transmission? Had accidentally missed one without realizing it until finding one bolt from taking this beauty out of the garage with gears working now because of your wisdom and sharing knowledge. Thank you.

The transmission got gears now from replacing the gasket as the original was worn out.

That's hard to say, long term probably a yes. A missing bolt could/would cause a leak. So really the damage or ill effect would depend on which one was missing.
I can tell you that the rear most "C" bolt back by the forward accumulator is overlooked. For me that is the last bolt I put in. I don't count them until I torque them and I often have to dig in my parts wash basket for it.

 

[Tranzman]

I had an old TH350 in a 76 Buick Lesabre. I drove it for 185K on a rebuilt motor and transmission before selling it. Sometime along the way the transmission started acting funny, delayed reverse if I remember correctly. I pulled the pan and found a bolt on the bottom. Put it back and re-torqued every one. problem solved. It had to be loose for a long time to be laying in the bottom pan.

 

[PeteD]

I had an old TH350 in a 76 Buick Lesabre. I drove it for 185K on a rebuilt motor and transmission before selling it. Sometime along the way the transmission started acting funny, delayed reverse if I remember correctly. I pulled the pan and found a bolt on the bottom. Put it back and re-torqued every one. problem solved. It had to be loose for a long time to be laying in the bottom pan.

Great story. T350 survival helped by lack of abusive use when in reverse. Found out hard way not to downshift them to 1st gear unless below 10 mph. Smoked sum clutches (twice)

 

[robert.lopez.031994]

Devil's in the details.
Correct bolt in correct location , correctly torqued, is a must for correct auto trans function.

Well shoot. Time to redo the process to get the last bolt in. Haven’t been able to find the torque for each bolt on the forum nor the manual I have in my possession. Only one I found close was from a 2.2. Not a 4.3. But, more than likely different. Not sure if it’s 8lbs of torque. Only done hand tight to certain ones as felt on few if going any further would break the bolt head. Even though the bolt went in smoothly. Only done hand tight with 25 degrees extra or 1/4 more to the torque on most bolts that are in atm.

Thank you @PeteD

 

[robert.lopez.031994]

That's hard to say, long term probably a yes. A missing bolt could/would cause a leak. So really the damage or ill effect would depend on which one was missing.
I can tell you that the rear most "C" bolt back by the forward accumulator is overlooked. For me that is the last bolt I put in. I don't count them until I torque them and I often have to dig in my parts wash basket for it.

Definitely don’t want the leak nor the transmission to be ill from one little bolt missing.

 

[robert.lopez.031994]

I had an old TH350 in a 76 Buick Lesabre. I drove it for 185K on a rebuilt motor and transmission before selling it. Sometime along the way the transmission started acting funny, delayed reverse if I remember correctly. I pulled the pan and found a bolt on the bottom. Put it back and re-torqued every one. problem solved. It had to be loose for a long time to be laying in the bottom pan.

Thank you for the backstory too @Tranzman. I really appreciate it. Comes a long way to know from people’s story to have a good/general idea of one is undergoing. Also, to stop the mistake at it’s track sooner than later.

 

[Tranzman]

I use 120 lbs. inch for all 6mm bolt threads (usually 10mm head) & 18 lbs. ft. for all 8mm bolt threads (usually 13mm heads)....

 

[robert.lopez.031994]

I use 120 lbs. inch for all 6mm bolt threads (usually 10mm head) & 18 lbs. ft. for all 8mm bolt threads (usually 13mm heads)....

Had done 12lbs of torque to each VB bolt, put the last bolt to the VB, and transmission working at 100% now. Thank you @Tranzman and @PeteD

now time to check the forum for P0134 and P0154.

 

[Tranzman]

Had done 12lbs of torque to each VB bolt, put the last bolt to the VB, and transmission working at 100% now. Thank you @Tranzman and @PeteD

now time to check the forum for P0134 and P0154.

P0134 O2 insufficient activity bank 1 sensor 1 and P0154 bank 2 sensor 1. Usually just bad sensors.

 

[robert.lopez.031994]

P0134 O2 insufficient activity bank 1 sensor 1 and P0154 bank 2 sensor 1. Usually just bad sensors.

Brand new acdelco brand too. Can only assume bad wiring somewhere or got burnt, sliced somewhere.

 

[Tranzman]

Brand new acdelco brand too. Can only assume bad wiring somewhere or got burnt, sliced somewhere.

I use Denso brand for most GM. Denso is the OE manufacturer for most GM O2 sensors. By the definition the PCM is seeing activity or movement. Upstream O2's should have a lot of 100-900mv movement. If they are sluggish in that range or only move 300-700mv you'll get that code. Wouldn't be the first time i heard of sluggish reacting O2's...

 

[robert.lopez.031994]

I use Denso brand for most GM. Denso is the OE manufacturer for most GM O2 sensors. By the definition the PCM is seeing activity or movement. Upstream O2's should have a lot of 100-900mv movement. If they are sluggish in that range or only move 300-700mv you'll get that code. Wouldn't be the first time i heard of sluggish reacting O2's...

Time for some new sensors then. Had read a bit from the forum that it needs to fluctuate around .1-.9 than staying at .445?