trans pressure
Thread Starter
11 Second Truck Club
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Joined: Jan 2002
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From: Missouri
trans pressure I also posted this in the PCM section, maybe someone here can help too. If the trans pressure has been raised by turning the screw on the PCS sol. can that be negated by changing the numbers in the pressure table in edit? I have a used tranny that I know nothing about except it was supposedly rebuilt and "beefed up" about 4000 miles ago. I drove the truck before I took it out and it would bark 1-2 and 2-3 with the stock 5.3 engine. It shifts too hard under normal driving so I figure someone may have jacked with the PCS and I would rather not pull the pan if I don't have to but I want to soften it up a little.
TECH Enthusiast
Joined: Nov 2001
Posts: 521
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From: Farmingdale NJ
Check out the sticky on the top of this forum. There's a LOT of good information on line pressure, what changes line pressure, and what the effects of different changes are in relation to each other.
My personal opinion is you're MUCH better off dropping the pan and turning the screw back, rather than screw with PCM settings. Reason being the pressure variation may not be linear, and without a diagram of the curve you'd never be able to get the tables right.
Fix the known problem and you'll always be safe
Edit:
I re-read your first post, and it seems you're not "sure" if someone turned the screw on the PCS. There could be other modifications that cause that too, either a shift kit, pump modifications, etc. On second thought get a transmission pressure gauge and check the line pressure in all gears. If it's more than just a little over 200psi, there's more going on than tuning or PCS setting.
My personal opinion is you're MUCH better off dropping the pan and turning the screw back, rather than screw with PCM settings. Reason being the pressure variation may not be linear, and without a diagram of the curve you'd never be able to get the tables right.
Fix the known problem and you'll always be safe
Edit:
I re-read your first post, and it seems you're not "sure" if someone turned the screw on the PCS. There could be other modifications that cause that too, either a shift kit, pump modifications, etc. On second thought get a transmission pressure gauge and check the line pressure in all gears. If it's more than just a little over 200psi, there's more going on than tuning or PCS setting.
Thread Starter
11 Second Truck Club
iTrader: (2)
Joined: Jan 2002
Posts: 1,412
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From: Missouri
OK, thanks man. I feel like a dummy not seeing the sticky up there. I think you are right -I need to put a gauge on it and see what is going on first. I hate having an unknown tranny but it sure seemed to work good and I got it for an even trade for a bone stock tranny with me doing the R&R. I have this thing in a 94 work truck with a supercharged 5.3 I just installed it and don't even have it running yet so once I do the tranny will be at the top of the list to straighten out.
On The Tree
Joined: Jun 2002
Posts: 155
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From: Doniphan, MO
You probably will not be able to determine anything by dropping the pan. Certainly not if the Force motor, pressure solenoid, has been adjusted.
Get a guage on there and find out where you are. It may all be in the PCM.
Get a guage on there and find out where you are. It may all be in the PCM.
