Having 2-3 shift overlap - Thinking of switching from 4.2 apply lever to 3.8

Having 2-3 shift overlap - Thinking of switching from 4.2 apply lever to 3.8 - Any Other Thoughts?

MobileCustoms said
Hi guys,
I'm in the middle of lots of maintenance items on my Barracuda, one of which is addressing the 2-3 shift overlap clunk. e built this tranny (727) several years ago (2015) and it's still running strong but has the nasty 2-3 overlap clunk only when under very light throttle conditions.

It's currently got a 4.2 lever in it with I believe to be 12 springs, but possibly 15. I can't remember and my old photos don't show what we loaded for springs.
It's also got a reverse manual valve body with billet servos, heavy duty bolt-in sprag, etc.
I've been reading through the threads quite a bit and it seems like swapping a 3.8 into it might be good idea. I should probably also check the adjustment on the band today. From what I've read, that should be around 1.75 turns out for the 4.2 and 2 turns for the 3.8, correct?
Also, I have a 4400 stall
Thanks!
-Doug

View attachment 1716247846

I have gone 2 or 2 1/4 turns out for 4.2 lever after torquing to 72inch pounds. I have also gone 2 turns always for a 3.8. Is the second gear servo a dual spring setup (Early year model). What ATF are you running? If it’s Type F, it has no friction modifiers in it, so it engages the clutches very very quickly, which can sometimes add to that 2-3 overlap at light throttle conditions.

With the transmission you have, 15 springs in high gear drum, dual spring second gear servo, and 4.2 lever is how I would set it up if it were mine or a customers. Being that it is out of the car, I’d verify the springs in high gear drum, and if the second gear servo is single or dual spring. I had a 3.8 in mine for years with a big piston High gear drum 18 springs installed. When driving around the pits warming my car up on a fast idle I would still feel the 2-3 overlap pretty good. As soon as the trans saw a little bit of temp (125 degrees and higher), the 2-3 overlap would be smoother and not as noticeable. Going down the track wide open throttle I would never feel it, it just shifts quick, precise, and no issues. Best thing I can say I would do at light throttle conditions, when you go to shift into 3rd, back off the throttle and let car coast for a second then put it in 3rd. That is what my good friend does with his to avoid that harsh overlap feeling at light throttle. I hope this helps!

RJ