I was just wondering if anyone has tried puttin a manual lock up switch on there trucks, my converter works perfect fine if my trans is cold, but when it warms up it quits locking in.. Anybody have any advice?

 

when you say it locks up when the fluid is cold, how cold? It isn't supposed to lock until the fluid reaches ~135* or so. When you day it stops locking up when it's warm, how hot is warm?

 

factory tuning has the converter lock up enabled above 75* fluid temp... if it locks when cold, and wont properly when up to operating temp, you have other issues.

 

I don't know exactly what temp. The fluid is when it's cold..When I crank the truck from sitting awhile the converter locks up.. By the bay it's a 9.5" 3500 stall..after I drive it ten or 15 mins it stops locking in

 

whats the ambient temp outside??? it should be operating just the opposite...

 

It's cold here like 26 degrees, but I was just wondering if I could put a manual lock up switch on it?

 

better to find the root cause of your problem than put a band-aid on it hmm?

 

you COULD... but chances are, its a tuning related or solenoid problem... what brand of converter do you have and what do you do for tuning?? have you tried scanning for lockup command? I know in HPT you can command it manually with the VCM controls... easy way to narrow down if you have a software or hardware problem

 

Yea I know but we have retuned it like 3 times it's all brandnew stuff, new trans,new converter,

 

I've installed bad parts right out of the box and had ro re-diagnose problems because of it... I understand its frustrating but like we've said, it would be better to find out WHY its not working right... you can try a switch, but if theres other problems it may not work that way either.

also, a lock-up control switch like what youre suggesting has the potential to throw the trans into limp-mode and give codes... why not just fix the problem?