I did this swap about a year ago and I've searched a few times and it seems I've come up with contradictory info.
My 92 Z was a front disk rear drum car (non G92) but now it's 1LE front with a 9 bolt PBR rear (all pulled from a scrapped 89 TTA)
What Proportioning Valve do I need?
Thanks for any info you can give.
Jim

 

The following from Dan Burke's site: GM part #10136840 1990-'92: M1.5 tube nut threads.

JamesC

 

Ok, here is what I've found during my searches.
My car was originally a J41 with valve 10136839
The donor car was a late 89 with valve 10136840
GM part#s 10136840 and 10136841 have been superseded (combined) by GM to part# 10136839
But beginning in late 1989 through the end of production in 1992 this 10164112 was used on ALL J65 and 1LE equipped cars.

So do I need 10164112 or GM Part number 10136839? (the new # for 10136840) or are they both the same.
Gm parts direct has them both and they are both the same price.
Thanks
Jim

 

Here's the whole quote from Mr. Burke:

14089496 1989 1st design: M1.0 tube nut threads (For 1982 - early 1989 applications) [This is the one that I used on my 85 to upgrade both front and rear to 1LE. As far as I know, the only difference between the 496 valve and 840 is the threads.]
10136840 1989 2nd design: M1.5 tube nut threads (Late 1989)
10136840 1990-'92: M1.5 tube nut threads.

Why not simply use the valve fom the donor car if the threads are the same?

JamesC

 

It was scrapped after the swap

 

You need the 10164112 valve for your '92.

Ed

 

I am going to have the exact setup soon: 1LE fronts, nine bolt 3.27 rear with PBR's. I went and got a whole new MC for the swap: Part# 18014287.

Ed and James are the best.

 

Where is a good place to get this part 10164112? I tried to order via GMParts Direct and I got an email saying it is discontinued.

I have a 91 with front disc/rear drum and I had a 95 rear with disc installed. It works, but not very well with the stock proportioning valve.

 

What options is this 10164112 valve for?
4 whhel disk? and/or 1LE?

 

I ordered the whole MC that came with the prop valve. That may be the only option to get one new. Otherwise, hit the Pick-n-Pull.

4 wheel disk.

 

If anyone is looking for a new one the following dealers have them in stock:

502-348-3964 KY
803-750-4800 SC
336-760-7038 NC

I got mine from the KY dealer for $104 incl shipping.

 

If you are looking for these valves they are now discontinued, as are the valves for the earlier 1LE cars. Good luck!

Ed

 

I got the whole MC with the correct prop valve for ~$160 FWIW.