Oh, as in gear ratios...

I got that info.

700R4 / 4L60 / 4L60E / 4L65E
1st: 3.06:1 2nd: 1.63:1 3rd: 1:1 (direct) 4th: .696:1 (overdrive) Reverse: 2.294:1

4L80E (with standard ratios)
1st: 2.48:1 2nd: 1.48:1 3rd: 1:1 4th: .75:1 Reverse: 2.077:1

4L80E (with 2.75:1 1st gear aftermarket ratios)
1st: 2.75:1 2nd: 1.57:1 3rd: 1:1 4th: .75:1 Reverse: ??? (can't find any info & doesn't really matter all that much)


For reference:
TH350 (with standard ratios)
1st: 2.52:1 2nd: 1.52:1 3rd: 1:1 4th: ---- Reverse: 1.93:1

TH400 (with standard ratios)
1st: 2.48:1 2nd: 1.48:1 3rd: 1:1 4th: ---- Reverse: 2.077:1


Hope that helps. As you can see, the 80E has a fair bit less gear spread than the 60 (even with a low gear option). Which can be good for reduced rpm drop, but potentially bad for fuel economy.

'Dreamin'

 

holey crap that exactally what i was looking for!!! thanks man

 

You're most definitely welcome.

'Dreamin'

 

Wow, thats $1000.00 in parts alone

 

You are better off to start with 2001 or later 4L80E,everything from a 6.0 2500 truck will work.So check the wrecking yard to save some money a complete transmission with the switches,flywheel and converter would be a good start.You'll need an adaptor harness,a second out speed sensor cable and programming.You'll need to modify your crossmember to reposition the transmission's mount.The stock driveshaft will probably work with a th400 output shaft and a adapter u-joint[mine did].If you go aftermarket on your converter Yank requires a crank spacer and 6 bolt flywheel[I have one]and a Vigilante will bolt to your stock flywheel.If you start to do the swap I've got some of the parts laying around my garage so maybe I can help.

 

what all do you have laying around?

 

I've got a crank spacer with the bolts,a flywheel from a HD truck and a Yank SC3000 converter for a 4L80E.

 

sent you a pm