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c6 shifting very weird with fresh rebuild

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badshoe
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89lxcoupe
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c6 shifting very weird with fresh rebuild Empty c6 shifting very weird with fresh rebuild

Post  89lxcoupe September 13th 2010, 1:23 pm

the trans wont manual shift to 2nd from 1st and when In drive it shifts to 2nd and drive very fast and you can barely feel the shifts. i have tried un pluging the vacuum to the modulator with no change in the shifts and adjusted the modulator all the way in and no change !


trans specs:

fresh rebuild

transgo shift kit stage 2

kevlar band

f lever

stock servo

purple stripe modulator "old"

2600 stall

89lxcoupe

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Join date : 2010-05-13

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Post  bruno September 21st 2010, 8:02 pm

get a hold of Frank merkel ...he is the c6 king

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c6 shifting very weird with fresh rebuild Empty Re: c6 shifting very weird with fresh rebuild

Post  badshoe September 22nd 2010, 12:12 pm

Is the modulator valve in the case backwards?

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Post  whitefield September 22nd 2010, 12:30 pm

Ck your govenor on the tailshaft make sure those valves are not stuck or the springs misssing. I would also ck the valvebody , make sure it is clean and the check balls are in the right spot or make sure the are not missing.
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Post  89lxcoupe September 22nd 2010, 2:04 pm

badshoe wrote:Is the modulator valve in the case backwards?

i checked it and it was in right, i ended up taking the modulator apart and took a shim out that i put under the spring and put a black stripe modulator valve in it and it seems to shift ok now. it does shift to drive awfully fast after going to 2nd ! i'm going to adjust on the modulator valve some more and see what happens.

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Post  Gregaust September 23rd 2010, 5:32 pm

Modulator Apart and shim ??

Some do upshift quick like that . Modulator adjustment may help or one i did i had to go to a longer pin

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Post  69F100 September 24th 2010, 9:38 pm

Gregaust wrote:Modulator Apart and shim ??

Some do upshift quick like that . Modulator adjustment may help or one i did i had to go to a longer pin

I was just going to ask about the pin I have changed types of modulator and had to change the pin to get to shift right.
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Post  Gregaust September 25th 2010, 5:13 am

I have found some modulators do vary. One i did a little while ago, original modulator the pin has a little preload, new one pin was loose. Had to go from 42.3mm pin to 43.3mm

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Post  bb429power September 25th 2010, 7:51 pm

Same thing happend with our car with a c4, it was a combiination of the fluid level being off and the linkage needing to be adjusted.
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