4l60/65 5 speed???? Wtf!!!
4l60/65 5 speed???? Wtf!!! Hi guys well i just recently performed a full rebuild on my trans. I was driving today 4 days after rebuild... and i noticed i have 4 gears THAN!!! i hit over drive.. so its like this 1st-2nd-3rd-4th- Overdrive (lock UP). I will take a vid on the way to work tomorrow morning cause this is making me
. If there is something i should know please don't be afraid to shine in. Thanks
. If there is something i should know please don't be afraid to shine in. Thanks 1-2-3-4 than (kinda of anther gear) is LOCK UP??? it never had this before lol
i had a stock EVERYTHING including stall and it was
1-2-3-Lockup or over drive lol never 1-2-3-4-lock up
kool thanks i thought some how god dropped his wisdom on my transmission and added another gear lol
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Lockup feel can be changed through computer tuning, specifically altering the PWM table. Pulse width modulation is basically the computer telling the converter to not lock 100%. It pulses the lock signal to force the clutch to slip on purpose. The purpose for this is to soften the engagement of lock-up. It's for comfort for the average buyer. With kits like the trans-go HD2 or computer tuning, you can force the computer to either command 0 or 100% but nowhere in-between. This gives a solid, firm feel to the clutch engagement and makes it much more noticeable like what you are feeling.
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TECH Regular
Joined: Mar 2009
Posts: 420
Likes: 0
From: Ricerville
Yes, under normal circumstances the computer will allow the converter clutch to slip on in OD or when the shifter is in D3, but a lot of people tune out this "slip" either with a shift kit, or a Sonnax kit, or with tuning in the computer.
My old 3800 V6 Firebird A4 had the dreaded P1870 code and the converter wouldn't lock. When the tranny shop rebuilt it, they deleted the slip function and it really did feel like another gear. Also, what SHOULD have been done in my situation was to raise the lockup RPM to prevent converter clutch chatter at low RPMs.
My old 3800 V6 Firebird A4 had the dreaded P1870 code and the converter wouldn't lock. When the tranny shop rebuilt it, they deleted the slip function and it really did feel like another gear. Also, what SHOULD have been done in my situation was to raise the lockup RPM to prevent converter clutch chatter at low RPMs.
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now to tunning my ls1 s13 
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
You can verify that it is TCC lockup like this:
watch the rpm as you ride/un-ride the brake pedal while keeping the throttle constant, you will see rpm jump up (ride) and then back down (un-ride).
watch the rpm as you ride/un-ride the brake pedal while keeping the throttle constant, you will see rpm jump up (ride) and then back down (un-ride).
