Kickdown linkage

[Jhnybgd]

Hey All,Can anyone tell me how to adjust the linkage on my RR.I changed from a 2bbl to a 4bbl and the linkage isn't right and it shifts crappy.Thanks for any help.

[MoparMarcIdaho]

If its hanging in gear and not shifting soon enough shorten the adjustment.If its going to high gear to soon lenghten it some.

[John Kunkel]

When swapping from a 2-barrel to a 4-barrel the linkage will need modification since the 2-bbl throttle lever is further back than the 4-bbl. This makes the upper link/rod too short, it needs to be lengthened by the amount of the difference in throttle lever position.

Also, when changing to an aftermarket carb with the universal GM throttle lever, the Mopar lever extension must be used or the linkage ratios will be incorrect.

[71SATELITE]

John just asking but the longer throttle lever will make the kick down go sooner? I recently experienced the same issue in an after market carb when changing from 2 to 4 bl. The linkage is set correctly its just the tranny doesn't kick down nearly soon enough!

[John Kunkel]

The problem with the generic GM throttle lever found on most aftermarket carbs is that it is too far inboard and the available holes for attaching the linkage are wrong for a Mopar, this alters the linkage ratio and thus alters the travel.

The correct Mopar adapter places the linkage in correct alignment and the hole placement for the throttle cable and linkage is correct

[Eggman]

The Lokar setup for Mopars is by far the best way to go.I love it and wish I had used it years ago!

[71SATELITE]

What is the correct travel for a 727? Its easy to set to the original placement but my question is how far should it travel forward? I made a make shift linkage adapter for my kickdown cable because it seemed to kick down at about 3/4 throttle after the engine was all wound up and made for a major bog. I made an arm extension with several holes today that will allow me to adjust the ratio of just how far forward the cable goes but the question still remmains how far does the cable have to travel?

[John Kunkel]

The transmission lever should be all the way forward with the carb at warm idle and should be near all the way back with the carb at WOT.

[71SATELITE]

Thanks John I don't know if I nailed it exactly but my bracket took the bog out it she kicks down right on time like a champ!! Now its one mean slant!! I measured the arm and travel on my 71 and tried to mimick it with the cable. Seemed to work!! Thanks again.

[Jhnybgd]

Thanks for all the replies,Would the linkage bieng out of adjustment cause the tranny to slip?So John K. the linkage should be fully forward against the carb stud at warm idle,and fully back at w.f.o?

[MoparMarcIdaho]

It all depends on driving habits and rear end ratios.At least we can dial it in easily compared to the other guys who have to deal with vaccum modulators.Also be sure to attach a return spring to the linkage for proper operation.

[John Kunkel]

Originally Posted by Jhnybgd

Thanks for all the replies,Would the linkage bieng out of adjustment cause the tranny to slip?So John K. the linkage should be fully forward against the carb stud at warm idle,and fully back at w.f.o?

There is no requirement that the lever be full back at WOT, just near full back.

Misadjusted linkage can cause slippage when shifting.