manual valve body for 904 auto - Pirate4x4.Com : 4x4 and Off-Road Forum
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Old 03-14-2006, 07:18 PM   #1 (permalink)
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Post manual valve body for 904 auto

I am going to put a reverse manual valve body in my 904, are there any negatives besides a tired arm? Will it do any damage to the tranny? Are the shifts going to be too strong to drive on the road?
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Old 03-16-2006, 07:07 PM   #2 (permalink)
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Many manual valve bodies eliminate engine braking, at least in some gears. This can be detrimental to control off-road and on. It's not the end of the world, but you will most likely miss the engine breaking if you install a valve body without any.

As for damage to the tranny, I've been told by my trans guy that you should only downshift the tranny under power, meaning that if you want to downshift to pass someone on the highway, do so while giving it some gas, and if you're coming to a stop leave it in whatever gear it's in until you come to a complete stop, then shift back into first. Some people sqwak about the high line pressure beating up the tranny. I've never heard of any issues from high line pressure, it increases the grip of the frictions and keeps slippage to a minimum.

That said, I beat the almighty snot out of the forward pattern full manual TH400 in my rock buggy, and have never had any issues with it. I shift it however I want, whenever I want.... on the gas or off. Then again, the tranny is built to the hilt with extra clutches, hardened everything, extra support bearings, kolene steels, kevlar clutches, the whole 9. Plus a 27,000 GVW tranny cooler mounted in and of itself separate from the radiator.

All in all I recommend the manual valve body for the fact you can lock it into 2nd & 3rd gear low range and it won't ever shift on you, plus I love its's simplicity & durability. The upshifts are harsh under power, but not bad if you let off the gas as you upshift. A comfortable, easy to operate shifter is a must. consider a looser converter (2000-2500 stall works well) and a decent cooler while you are working on the tranny, they will compliment the manual valve body well.
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Last edited by HsOffRoad; 03-16-2006 at 07:11 PM.
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Old 03-16-2006, 09:28 PM   #3 (permalink)
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Most of the manual valvebodies for the 904/727 don't have engine breaking in 1st gear, they do in 2nd.
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