Photos of trans. modulator valve replacement?

[saxon]

Are there any posts or strings that show photos of replacing the transmission modulator valve while the transmission is still on the vehicle (coming at the valve through the floor)?

If there are none, I will photograph the process sometime this weekend but I don't want to duplicate someone else's work.

Year & Model: 1991 4WD, EB.

 

[Glacier991]

I am not aware of any. A photo thread would be a welcome addition and would be submitted for consideration for elite membership privileges for a period of time.

 

[saxon]

Photos of modulator valve replacement

I've also looked around for photos of the Radius Arm Bushings replacement and photos of front end floor jack and jack stands positions (posted about those on different areas of the forum this morning).

Have not yet seen reponses to those other two posts; I plan to photograph those projects, too unless someone points out that its already been done.

btw, I'm new to modern american automobiles. Have a '54 Buick Super but all my other four wheel units have been or are German or Japanese. Been road racing vintage motorcycles for about 12 years; I do all the mechanicals myself.

Finally received my Haynes for the X today. Can't wait to read it front to back; have not previously owned a 4WD or anything w/ an auto trans (the Buick is a one-speed Dynoflow - doesn't exactly count). Owner's manual should arrive later this week.

Ramble, ramble.

 

[93TwotoneXLT]

Saxon, a picture thread would be great! I replaced the tranny modulator in my 93 4x4. Before I did it I looked around on the site and did find a thread on how to do it, just no pictures to actually show what it all looks like. However, the thread is very thourough and not having pictures didn't really hurt me any. As far as the job itself, it is not hard just a major PITA. I too went through the access panel in the floor on top of the transmission. It is defintely a tight fit. As a note, make sure that you get the pin out of the old modulator so that you can install it on the new modulator. Mine came out with the old one but I have heard of them getting caught in hole and being a real pain to get out. Make sure that you don't bend it or you will have problems sooner than later with shift points and the such. Plus, it is very hard to find these in the aftermarket parts world. If I remember, the pin is about 3" long and black in color. Try not to waste too much time from pulling the old one out and putting the new one in. I wasn't thinking about it when I did mine and about 1 quart of tranny fluid came out of the hole before I caught it. It leaked that fluid in about 2 minutes so be sure that the new tranny modulator is lubed at the base and after you put the pin in is ready to go in. Sorry if this seems to be going on and on, hope this helps.

 

[Glacier991]

Good point on the pin. It is however more like about 1-1/2 inches or so. I have some spares if anyone loses one btw.

 

[BrooklynBay]

Here are some pictures of pins from one of Glacier's photographs:

 

[BrooklynBay]

Here is another picture of how those pins look in relation to the modulator:

 

[93TwotoneXLT]

Yep, I was definately wrong about the length When I took mine out of the old modulator I went over to the work bench to clean it up a bit and noticed the fluid leaking on the ground. One "oh s**t" later I was back in the truck with the new modulator and pin before I could really look at the length of the pin.

 

[Glacier991]

The top modulator in the picture is a newer adjustable version. The TV valve shown is an upgrade available in the Transgo Valve Body kit, with a return spring and a slightly longer than stock pin.

The bottom photo is all stock parts.

 

[BrooklynBay]

Glacier, which one do you like better, the adjustable one, or the non adjustable one? I saw a set screw inside the head of a stock version. I guess it could be adjusted, but it's not as easy as a knob. Is there any noticeable improvement with the Transgo spring, and longer pin? What about the turbo modulator? I know that it is calibrated differently. How would that feel compared to the regular one?

 

[Glacier991]

For all intents and purpose the stock modulator is not adjustable once installed. The upgrade is easily adjusted, big plus. As for the TV, I cannot say i notice a difference I can say "Wow there's that new TV!", but then it is just part of a number of changes, so it would be hard to separate out. Educate me on the "turbo" modulator? I admit my ignorance.

 

[BrooklynBay]

On page 201 in the 2005 Axiom book, it shows a few part numbers of different modulators. Here is the exact information:
Single Line (Exc Turbo) 85-89 56160E E5TZ-7A377-C
Single Line (Turbo) 85-94 56160T 84DT-7A377-AB
Single Line (W/Modojust Dial) 85-92 56160EA E5TZ-7A377-C
Valve, Under Modulator 85-94 56163
Modulator Pin 85-94 56164

 

[BrooklynBay]

If the modulator is factory calibrated, why would there be an advantage to being able to adjust it manually? Maybe this is just for fine tuning it when it starts to get old, and goes a little out of calibration.

 

[BrooklynBay]

Here is the information that is on Aceomatic's website:
VACUUM MODULATORS

Description Illust. Qty. Year Part# Reference
Single Dia - 1.330" 2701 1 1985-94 2272701
Single Dia - With Adjustment Wheel 2701 1 1985-94 2272703
Single Dia - ( Turbo ) Green Body ( 1.320" ) 2701 1 1985-UP94 2372705
Modulator Pin Gauge & Pin Stock 1 ALL 2262710