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#997860 Wed Jan 08 2014 07:12 PM
Joined: Mar 2008
Posts: 128
Raul T. Offline OP
Shop Shark
I've got a 57 Chevy 2-Ton with a two speed rear end. The way you shift the rear end is a splitter selector mounted on the gear shifter. A cable runs from this splitter selector to a splitter control valve mounted on top of the tranny. It has five hoses running to it. One small one, about 1/4 I.D. and four larger ones with about a 3/8 I.D. When the selector is in high I can hear a vacuum leak and it is affecting the engine performance and it even kills the engine every now and then. Are these splitter control valves still available or what is a good replacement?

Glory Bound...
Joined: Dec 2003
Posts: 2,736
Shop Shark
They likely are but my guess is a hose leaking or a hose fitting. The control valve would be available thru heavy duty parts suppliers or HD truck dealers.

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Joined: Mar 2008
Posts: 128
Raul T. Offline OP
Shop Shark
It's got new hoses and clamps, so I don't think that's the problem. Plus the vacuum leak can be heard in the area of the control valve.

Glory Bound...
Joined: Feb 2013
Posts: 42
New Guy
Have you tried your local Napa auto parts house?
Bring that valve in and set it on the counter.

Joined: Jun 2004
Posts: 8,595
It could be the diaphragm & you hear it in going through the valve. Hold you hand or a shop towel around the valve & see if you can locate the leak.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Joined: Nov 2010
Posts: 1,189
Shop Shark
ratru,There are two valve "stoppers", in the control valve. To gain access,loosen the hose clamps,and remove all 5. Remove the two bolts that secure it to the SM420. You'll need to split the casing to access the cable-anchor point,to remove the unit.Once you have the unit on the bench,inspect the bores for dust/debris,that may be causing the problem. My "stoppers" were fine,but enough "junk got into the bore,to cause a leak. You may be able to replace just the "stoppers", (if worn),which would be much cheaper than buying a new unit. Be careful when splitting the housing,to try and save the gasket. I had to use "Permatex. It split in 3 places. L.o.L. Hope this helps.

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Joined: Jan 2008
Posts: 4,841
Vacuum 2 speed diaphragms are notorious for going bad. I usually start at the other end and apply vacuum to the chamber, then check the lines. If that is good, I tackle the selector valve.

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