200 R4 shifting issue

[pontiacgp]

I replaced my rear end (my vehicle's rear end actually) with a posi 342. It originally had the 241 gears. The shift from 1st to 2nd with the 241 at WOT was around 5000 rpm but with the 241 it shifts before it hits 3000 rpm, 2nd and 3rd gears shift point at WOT is in the 5500 range. I replaced my transmission with another 200 R4 that had the same shift points and I was talking with a friend of mine last night who encountered the same shifting issue when he dropped 342 gears into his vehicle. I always thought that the governor dictated the shifting points but since these shifting points are drastically different I must be wrong, once again....😳

anyone have any ideas on what's causing the 1st gear to dump into 2nd so quickly?

 

[JESSE]

200r4

your right about the gov controling the shift ,but on a 200r4 you have a cable that causes the pressure and your gov has to over come the tv pressure.all you have to do is release the cable at the carb end and push the cable to the rear then lock the cable. push your gas pedal to the floor real hard,this will put you in the ball park.road test your car and see how it shifts,if it shifts early release the cable and push it to the rear one notch at a time and road test until your happy with the shift good luck jesse 🙂

 

[pontiacgp]

I have played with the position of the TV but that didn't help the low shifting point of 1st to 2nd at WOT. If I just take off normally the 1st to 2nd is fine since it shifts close to 3000 but when I take off at WOT 1st gear is real short and shifting into 2nd at around 3000 kills the torque....2nd to 3rd is up around 5000 and 3rd into OD is up there too....

 

[JESSE]

200r4

do you have a shift kit installed in your trans? how does it shift in manual 1-2 i think you can get a governor spring kit that might help.

 

[megaladon6]

when you changed the rear gears you changed the load and output RPM's of the trans.

 

[pontiacgp]

Re: 200r4

do you have a shift kit installed in your trans? how does it shift in manual 1-2 i think you can get a governor spring kit that might help.

there's no shift kit installed..I can manually shift it from 1st to 2nd with as high rpm as I want. I thought the governor spring would shift the same rpm for 1-2 ans it would for 2-3..

 

[JESSE]

200r4

the throttle valve controls the pressure the gov has to over come,the more you push the throttle the higher the speed goes and the more the gov has to spin before it can over come the pressure and all of this is controled by cable adjustment did you try my method of adjustment?

 

[pontiacgp]

Re: 200r4

the throttle valve controls the pressure the gov has to over come,the more you push the throttle the higher the speed goes and the more the gov has to spin before it can over come the pressure and all of this is controled by cable adjustment did you try my method of adjustment?

yea I tried that before I posted and nothing changed the shift point of 1-2. I went as far as tightening it enough to have the kickdown 3-2 at a light acceleration in 3rd gear....

 

[JESSE]

200r3

i can only quess that the new rear gear ratio and the low gear of the trans causes the gov to shift at what feels early to you the only thing i can suggest is install a shift kit,the kit has springs that drives up line pressure. i don't know if you have ever had a valve body off to do this? do you feel comfortable doing this kind of work?

 

[pontiacgp]

I did do some reading and there's a spring that controls the 1-2 shift and to raise the rpm of the shift point they say to put a washer to stiffen the spring. As far as being comfortable working on the inners of a transmission I'm not sure.....the most I've done is to wire in the TCI bypass for the lockup....a blown engine must be much easier to work on than some transmission with tons of little parts that runs on hydraulic pressure... :shock: