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I have adjusted the tv cable as much as I can an the transmission is still shifting way to quick ...




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Old 08-14-2015, 06:00 PM
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Qc transmission

I have adjusted the tv cable as much as I can an the transmission is still shifting way to quick an when I get in the gas hard it will not down shift??? Anyone have this problem or know what I can do to fix it?


Last edited by jbsrt10; 08-14-2015 at 06:02 PM.
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Old 08-21-2015, 02:06 PM
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this may be a few days old but id get a helper and have them step on the gas pedal with the engine OFF and you look at the lever on the tranny to verify its moving and while its to the floor grab the lever and see if you can move it any more, maybe you are adjusting backwards ?
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Old 08-21-2015, 02:55 PM
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Originally Posted by jbsrt10 View Post
I have adjusted the tv cable as much as I can an the transmission is still shifting way to quick an when I get in the gas hard it will not down shift??? Anyone have this problem or know what I can do to fix it?
The cable adjustment is fairly sensitive and doesn't take much one way or the other to change it. Once the cables START to move together, adjustment is correct. IF the tv is adjusted and is already under tension when the throttle cable moves, it will prolong your part throttle shift points. I.O.W. , your shifts will be further apart (more r.p.m. spread) due to the increase in line pressure.

If the tv cable adjustment is correct (the throttle cable and the tv cable START to move together because they BOTH have the same amount of initial slack), and you are still having issues, you may have a valve body problem or your pressure solenoids may have some band material in them and can't operate properly.

Some guys use (and like) the GM solenoids (you will have to drop the pan to get at them) but I use and recommend the stock ones. You could try changing those.

If there IS band material when you drop the pan, a rebuild is needed.

Do yourself/mechanic a favour and have a drain plug installed in your pan. They are cheap and save a mess when servicing.

I have the same amount of money invested in fixing/upgrading my 48RE since the truck was new as I do in my last complete engine overhaul.

Good luck.
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2005 QC N.A.
600+Wheel HP/598 TQ
505 C.I.

15.7L/100 km.
5600 pounds
11.88@115 in "D" for Drive

NO POWER ADDERS
Full B&B Exhaust WITH Cats
Unported Street-Striker Heads w Custom Roller
Unported O.E.M. Intake Manifold
FSTJACK Hand-Ported TB
MONSTER R/X Dual-Vacuum Catch-Can
A built 48RE transmission that actually keeps working!
Tuned by Maestro Chris Jensen

Last edited by rottenronnie; 08-21-2015 at 03:24 PM.
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