Hi all,

Today I fitted the K1 spring upgrade to try and illuminate a flare between 2nd and 3rd upsift on a 722.435. It has improved the speed it changes by at least half if not more but there is still a slight flare.

The shifts overall appear to be soft - could this be an issue with modulation pressure? And if so, would soft shifts be a result of too much or too little pressure?

I'm thinking I will have to get a pressure guage and some vacuum line so that I can hook it up to adjust pressure but where would I hook it up? And is the adjustment done at the IP or at the modulator itself?

Thanks for this.

Coincidently, all this trouble began after I replaced the vacuum pump.


1993 E300D
238,000K

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1995 E300 Diesel