Need some guidence .........installed Transgo Hd-2 shift kit and vette servo now want to go back and install a Sonnex 4th gear servo ........instructions from shift kit long gone .to install 4th gear servo do i need to pull out the vette servo and install as unit or can i just add the sonnex ??

 

You can just install the 4th providing the 2nd stays in place. Either way you should be just fine. Vince

 

Thanks for responding,actually bot the parts from you guys ....... had mixed opinions on 4th sonnex servo need from internet experts ..... so called you guys and whomever i spoke to said good idea for towing especially for holding OD longer on the flats ..... also suggested maybe to try to adjust TPS for less sensitive downshifting when in OD ...will talk to my programmer on that .again thanks for the advice trans works real nice with HD 2 and vette servo & no washers