Tahoe - 4l80e or 4l60e

[gregsb]

I meant re-gearing your differentials which you are already doing in addition to the solid axle swap. I was thinking this was a daily driver type of application not special purpose. I still think that going with a heavy duty rebuilt 4l60e is a viable option.

have you checked out http://www.expeditionportal.com/forum/ they have a lot of good information.

---------- Post added at 11:08 AM ---------- Previous post was at 11:03 AM ----------

Some food for thought for you and your project:

http://www.expeditionportal.com/forum/threads/37105-95-2-Door-Tahoe-SAS-project?highlight=tahoe

---------- Post added at 11:21 AM ---------- Previous post was at 11:08 AM ----------

Here is a thread talking about 4l60 vs 4l80 vs other options and some good suggestions:

http://www.expeditionportal.com/for...e)-and-question-(rather-long)?highlight=4l60e

Sorry, about all the posts but you peaked my interest here a bit as I would love to do what you are doing but life gets in my way.

 

[SunlitComet]

As long as you compensate for bigger diameter tires with the appropiate gearing you should be fine.

BASIC SPECIFICATIONS
Vehicles used in:
DIVISION MODEL
C/K Truck Chevrolet/GMC Pickup/Suburban
F Chevrolet/Pontiac Camaro/Firebird
G Van Chevrolet/GMC Express/Savana
M/L Van Chevrolet/GMC Astro/Safari
S/T Truck Chevrolet/GMC S10/Sonoma
Y Chevrolet Corvette
Transmission Drive
Rear Wheel Drive
4-Wheel Drive
All Wheel Drive
Transmission Type
4L60-E = 4: Four Speed
L: Longitudinal Mount
60: Product Series
E: Electronically Controlled
Automatic Overdrive with a Torque Converter Clutch Assembly.
Current Engine Range
2.5 L to 5.7 L Gasoline
6.2 L Diesel
Control Systems
Shift Pattern – (2) Two-way on/off solenoids
Shift Quality – Pressure Control Solenoid
3-2 Control Solenoid
Torque Converter Clutch – Pulse Width Modulated
solenoid control
Gear Ratios
1st 3.059
2nd 1.625
3rd 1.000
4th 0.696
Rev 2.294
Maximum Engine Torque
475 N•m (350 lb ft)
Maximum Gearbox Torque
910 N•m (670 lb ft)
Maximum Shift Speed
1-2 6,000 RPM
2-3 6,000 RPM
3-4 6,000 RPM
Maximum Gross Vehicle Weight
3,900 kg (8,600 lb)
Transmission Fluid Type
Dexron® III
Transmission Fluid Capacities (Approximate)
245 mm Converter (Dry): 7.9 L (8.4 qt)
258 mm Converter (Dry): 8.8 L (9.3 qt)
298 mm Converter (Dry): 10.6 L (11.2 qt)
300 mm Converter (Dry): 10.6 L (11.2 qt)
Transmission Weight
245 mm Converter (Dry): 65.4 kg (144.30 lb)
(Wet): 72.4 kg (159.55 lb)
258 mm Converter (Dry): 79.9 kg (176.60 lb)
(Wet): 89.2 kg (197.70 lb)
298 mm Converter (Dry): 70.5 kg (155.70 lb)
(Wet): 80.5 kg (176.16 lb)
300 mm Converter (Dry): 70.5 kg (155.70 lb)
(Wet): 80.5 kg (176.16 lb)
Converter Sizes Available
245, 258, 298 and 300 mm Converter (Reference)
Converter Bolt Circle Diameters
For 245 and 258 mm Converter – 247.65 mm (Reference)
For 298 mm Converter – 273.05 mm (Reference)
For 300 mm Converter – 275.05 mm (Reference)
Converter Stall Torque Ratio Range
For 245 mm Converter – 1.63 to 2.70
For 258 mm Converter – 1.65 to 2.07
For 298 mm Converter – 1.84 to 2.34
For 300 mm Converter – 1.84 to 2.34
Converter “K” Factor Range
For 245 mm Converter – 122 to 240
For 258 mm Converter – 110 to 179
For 298 mm Converter – 100 to 140
For 300 mm Converter – 100 to 140
Not all “K” Factors are applicable across the range of Converter Stall Torque Ratios.
Transmission Packaging Information*
Engine Mounting Face to Rear of Case
593.50 mm (Reference - Less Extension)
Overall Length
Current Minimum: 756.20 mm (Reference)
Current Maximum: 778.30 mm (Reference)
Case Extension Lengths
Determined by Customer Requirements
Current Minimum: 162.70 mm (Reference)
Current Maximum: 184.80 mm (Reference)
Current Converter Housings Available
245 mm and 258 mm (Small Bell Style)
298 mm and 300 mm (Large Bell Style)
Two-Piece Case with Separate Extension
Converter Housing
Main Case
*All dimensions shown are nominal.
Seven Position Quadrant
(P, R, N, D , D, 2, 1) / (P, R, N, D , 3, 2, 1)
Pressure Taps Available
Line Pressure
Information may vary with application. All information, illustrations and specifications
contained in this book are based on the latest product information available at the time of
publication. The right is reserved to make changes at any time without notice.
HYDRA-MATIC 4L60-E TRANSMISSION
RPO M30
HYDRA-MATIC 4L60-E
(FOUR-SPEED)

 

[sparg93]

good intel all around gents, thank you.

I'll put together a big writeup and my plans, but for now, I'm completing research on suspension and drivetrain.

it was great to see upgrading the 60 was the better option b/c converting to an 80 was really expensive and the sas is going to cost a fortune!!

 

[rabbiporkchop]

Lack of concern for fuel mileage. It take an extra 30 hp to turn it.

 

[SunlitComet]

Lack of concern for fuel mileage. It take an extra 30 hp to turn it.