bryant2482 Posted April 20, 2013 Report Share Posted April 20, 2013 im looking for 3.55.1 diff gears for my 720. if anyone is selling a set or has any suggestions let me know. thanks Link to comment
wayno Posted April 20, 2013 Report Share Posted April 20, 2013 Around here they want $106.00 for the 3rd member plus environmental fees, and it looks like they have come down $20.00 since I was last there. By the time you add in packaging and shipping and paying someone to do all the work, you easily have a $200.00+ bill. Do you have the engine to turn them kind of gears? Link to comment
bryant2482 Posted April 20, 2013 Author Report Share Posted April 20, 2013 are you saying the z24 isnt powerful enough to get it moving if i go with that size? Link to comment
datzenmike Posted April 20, 2013 Report Share Posted April 20, 2013 Sure it will but as the numbers go down the sluggishness goes up. The Mileage Option 720 with it's Z20 motor has a 3.364 and it works, but I can only assume it is no jack rabbit off the line. Most Z24 720 2wds had 3.545 diffs. Check yours, it's on the engine tag under the pass side hod hing bolted to the inner fender. Bottom line TRANS/AXLE....... FS5W71B....... HF35 Link to comment
wayno Posted April 20, 2013 Report Share Posted April 20, 2013 Sure it will but as the numbers go down the sluggishness goes up. The Mileage Option 720 with it's Z20 motor has a 3.364 and it works, but I can only assume it is no jack rabbit off the line. Most Z24 720 2wds had 3.545 diffs. Check yours, it's on the engine tag under the pass side hod hing bolted to the inner fender. Bottom line TRANS/AXLE....... FS5W71B....... HF35 Are you sure about this datzenmike, I rarely see 3.5 gears in the wrecking yards around here, they are all 3.8 or 3.7 gear ratios. I have a set of 3.545s in my 521 diesel, but I have the torque to get it going, but I don't usually use it to haul any kind of weight either. I would like a set of 3.364 gears to try them out on the diesel, I have not seen a set of them in a long time, but I have not been looking lately either. Link to comment
datzenmike Posted April 20, 2013 Report Share Posted April 20, 2013 From 'mid '82 on (or when the Z24 came out) they are 3.545 Z20 were 3.364 SD25s were 3.889 Cab/Chassis were 4.375 All automatics were 3.700 Earlier trucks with Z22 and SD22 were much different Link to comment
bryant2482 Posted April 20, 2013 Author Report Share Posted April 20, 2013 mine comes with the 3.89 gears. i also have smaller wheels on mine (205/50/15) Link to comment
bryant2482 Posted April 20, 2013 Author Report Share Posted April 20, 2013 when im hitting 45 mph in 4th gear im at 2600 rpms Link to comment
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