Experience with close ratio 4L60E
Thread Starter
Pro
Joined: Apr 2003
Posts: 568
Likes: 12
From: Jacksonville Florida
Experience with close ratio 4L60E
So, Im revamping my driveline. One of the changes I have made is to opt for the close ratio 1st and 2nd gear set in the tranny in an effort to launch better when I play, as well as avoid the current fall off from 1st to 2nd gear rpm during WOT runs. I'm interested in hearing the real world experience of other Forum members who have made this change, both in daily driving as well as when the hammer is dropped.
BTW, I'm running a moderate cam, (226-230/ 595 lift), Stage 3 5.3 liter heads, long tube headers and Callaway Honker intake and DD exhaust. After tuning, I'm at 410/405 hp-torque. My hope is that the gear change will make my launches more productive.
My install happens in early December. I will be changing out a 3200 Fuddle stall, which was the purpose for the project to begin with.
Thanks in advance for your time.
BTW, I'm running a moderate cam, (226-230/ 595 lift), Stage 3 5.3 liter heads, long tube headers and Callaway Honker intake and DD exhaust. After tuning, I'm at 410/405 hp-torque. My hope is that the gear change will make my launches more productive.
My install happens in early December. I will be changing out a 3200 Fuddle stall, which was the purpose for the project to begin with.
Thanks in advance for your time.
Safety Car
Joined: Aug 2011
Posts: 4,441
Likes: 407
From: Portland OR
Who makes that upgrade? I've never heard of it.
I suppose different planetaries could be available.
Btw, with a good torque converter, the rpm drop isn't as bad as you might think. The converter will cover it up.
My data logs show nearly the same drop from 1-2 and 2-3.
Ron
I suppose different planetaries could be available.
Btw, with a good torque converter, the rpm drop isn't as bad as you might think. The converter will cover it up.
My data logs show nearly the same drop from 1-2 and 2-3.
Ron
Thread Starter
Pro
Joined: Apr 2003
Posts: 568
Likes: 12
From: Jacksonville Florida
Who makes that upgrade? I've never heard of it.
I suppose different planetaries could be available.
Btw, with a good torque converter, the rpm drop isn't as bad as you might think. The converter will cover it up.
My data logs show nearly the same drop from 1-2 and 2-3.
Ron
I suppose different planetaries could be available.
Btw, with a good torque converter, the rpm drop isn't as bad as you might think. The converter will cover it up.
My data logs show nearly the same drop from 1-2 and 2-3.
Ron
With regard to the torque converter and the shift extensiion, I'm on board with that. One of the primary drivers of this project was to replace a dated Fuddle torque converter. It is working fine, but I've always had the yipes about how durable it would be over a few months of hard autocrossing. Conversations with the folks at Yank, Precision, and RPM indicated there was significant gains to be made in that area, and the rest of the project grew from there.
With the idea of gaining traction, it became evident to me that I needed to strengthen the remainder of the drive line. Right now, whats keeping me safe is the fact the tires are going up in smoke. Without making some changes, I suspect I would begin to break things as I gain traction. So instead of making incremental changes, I bit the bullet and am going through everything from the torque tube back.
Safety Car
Joined: Aug 2011
Posts: 4,441
Likes: 407
From: Portland OR
Ah, good. You are doing your homework.
TT prob would benefit from a good quality rebuild. I need to do mine. I got the parts from RPM, but haven't dug into it yet....its a big job!
I did rebuild the 3.42 diff with upgraded clutches, and hardened shafts from DTC. I didn't want it breaking either!
And yes, I should have looked inside the TT when I had it out. That was a mistake.
Ron
Fun project, enjoy.
TT prob would benefit from a good quality rebuild. I need to do mine. I got the parts from RPM, but haven't dug into it yet....its a big job!
I did rebuild the 3.42 diff with upgraded clutches, and hardened shafts from DTC. I didn't want it breaking either!
And yes, I should have looked inside the TT when I had it out. That was a mistake.
Ron
Fun project, enjoy.
