Adjusted line pressure....?

[TxDieselKid]

Alright, I got under the truck yesterday, and adjusted the line pressure on the transmission. I called Bill K. while I was doing it to make sure that I was doing it right, and he told me I was. I turned the screw on the left (line pressure) about 3 turns counter-clock wise, and the one just to the right of it (can't remember what that one does) about 2 turns clock wise. Took it for a drive last night, and it feels like it shifts a lot smoother. Didn't really get to open it up though, my 1/4 test track had other vechiles on it at the time.



Is this the right result, smoother shifts? I thought it was going to be a firmer shift, because it's going to transfer more power. It is a stock transmission, on a 2001 so I wasn't expecting a major change, but at least something noticeable.



Andrew

 

[Mopar-muscle]

is this a BANKS ad ??? ... hehehe

no , turning up your line pressure doesn't transfer more power thru the trans , only a TC change will do that , what its doing is adding more holding power to the clutches . smoother shift ??? not sure on that ...

 

[FL70CAT]

Where are the adjusting screws??

 

[CumminsPuller]

Good Post!!!!!!

Wnated to move this back to the top and keep it going... ... . I have been curious about this same subject... ... Maybe Bill K. can shed some more insight on this little adjustment and the idea and reasoning behind it.

 

[JohnE]

<a href=http://www.dieseltrans.com/DTTech/index. sht target=_blank>DTT</a> website has some <a href="http://www.dieseltrans.com/DTTech/valvebodys.html#pressure%20adjustments" target=_blank>technical data</a>

 

[LSMITH]

The changes you made will make it shift out a tad higher, maybe 200 rpm or so, under light throttle and give it more pressure to hold against slippage. The application of the gears was not changed. Hope this helps.

 

[CumminsPuller]

Trying to understand all of this... ... ... I am taking this as a good thing to do... ... . I pull a 40 foot flatbed gooseneck trailer and would love to do this..... I think it will really help, especially making it shift at a higher RPM so the transmission will not be lugged once the next shift occurs... ... Am I on the right track?

 

[redneckdr]

transmission line pressures

dodgeboy, there arealternatives for this. you may want to seriously consider a full transmission upgrade, depending on what you are hauling on your 40 flatbed?? rather than just turn the line pressures up, consider switching out the valve body for one of DTT's, or someone else's as a minimum.

 

[inarush76]

pressure increase

increasing line pressure while a good idea to assure at least that it is in spec, won't firm up the shifts appreciably as this is controlled by calibration inside the vb. The inefficiency of the stock converter would make it hard to feel firmer shifts anyway. Something that is not discussed much is the need for better lube flow to lube the gear train in the trans. Part of the valve body mods address this issue as well as shift feel and lock up feel. Actually, increasing line pressure only can lessen the fluid flowing through the cooler lines which is what actually feeds lube to the planetaries and other components. I recommend a full upgrade as it addresses a number of areas of concern at one time. Add to this the more efficient converter and internal upgrades and you have a truck that is a lot more fun to drive and the peace of mind that your trans won't self-destruct.



James Northum

DTT dealer/installer/Bill K. approved builder

(along with Bill, always in search of improvements)

 

[CumminsPuller]

With all that said, is there a reason to turn up the line pressure? I would love to do a full transmission upgrade, but money wise i cannot afford it now. But until that day comes would it be to my advantage to increaes the line pressure?

 

[LSMITH]

DodgeBoy, if I am thinking of the right guy you have a lot of miles on that rig. If that is the case leave it alone. Increasing pressures on a high mile transmission is not a good idea.



Yes there is a reason to turn it up, mine was just below low spec, I bumped it to the high end of the tolerance at about 30K miles. With the factory VB there is little range of adjustment.



Money wise take a look at a VB, they are not that expensive. But again if you have a lot of miles leave it alone, over about 75K hard miles and I would not risk an aftermarket VB for the purpose of raising pressures. You could get a VB set up with factory type pressures to increase cooler flow and hold gears longer ETC which is the real reason for the VB anyway. Pressures are matched to power output. Hope this helps.

 

[CumminsPuller]

Thanks LSMITH... ... I am just shy of 100,000 miles... ..... guess i will leave it alone... ... ... Thanks for the input... .....