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NV 3550 Early Bronco Swap
Benefits: Trans Gear Ratios: 1st 4.01 2nd 2.32 3rd 1.4 4th 1.0 5th 0.78 Rev 3.57 • Very Drivable transmission (nice gear separation/shifting RPMs) • Very nice Gears for the Bronco for street and trail (See Specs list below) -
4.01:1
1st gear for crawling (with 4.56 gears) -
0.78:1
5th OD for freeway (also avail is a 0.73:1 5th (special order)) • Modern technology makes for smooth shifting, quiet and
reliable operation. • High strength Unit – much stronger than the stock 3spd -
rated
for 300 ft-lbs at 7200 GVW -
with
lower vehicle weights torque rating is higher. -
with
4.56 gearing at the bronco weight (4900 GVW), strength is not an issue • Light weight Aluminum Case Unit (only 97 lbs) - About the same weight
as stock 3sd • Small size makes for nice fit in Bronco -
¼
in shorter in length than stock 3spd trans set up - fits with
almost no Body modification (except for shifter hole) • Shifter comes out in perfect location -
Center
of Tunnel cover Next to 4wd shifter -
Shift
tower is almost flush with body (1in body lift) -
Shift
lever placement is convenient for easy shifting. • Will work with Stock exhaust including headers (Using AA Cross
member) • Uses stock Bronco Bell Housing and clutch parts (only disk
will change) • Will adapt to Dana 20 or Atlas transfer cases • NO Driveline modifications are needed • Will work well with Stock axle gearing - Best match with 33 in tires and 4.56
gears • Overall a much less expensive swap than others. NV3550 SPECS:
Max input torque 300 FT-LBS at 7200 lb GVW
(Lower Vehicle Weight = more Torque Capacity) Trans ratios 4.56 axle gear ratio (Dana 20 2.46:1) Gear Ratio Final
drive ratio HR Final drive ratio LR 1st 4.01 18.29 44.99 2nd 2.32 10.58 26.03 3rd 1.4 6.38 15.70 4th 1.0 4.56 11.22 5th .78 3.56 8.76 FREEWAY SPEED: Vehicle with 33 in tires and 4.56 axle gear ratio. 5th gear (0.78:1) Vehicle speed Vehicle Rpm 55 1993 65 2355 70 2537 75 2718 80 2899 85 3080 Shift scenario: NV3550 Gear MPH RPM RPM Drop MPH RPM RPM Drop 1st 21.5 4000 26.8 5000 1683 2112 2nd 21.5 2317 ↓ 26.8 2888 ↓ 37.1 4000 46.4 5000 1587 1982 3rd 37.1 2413 ↓ 46.4 3018 ↓ 61.5 4000 76.9 5000 1143 1427 4th 61.5 2857 ↓ 76.9 3573 ↓ 86.1 4000 107.6 5000 880 1100 5th 86.1 3120 ↓ 107.6 3900 ↓ Other Bronco Transmission comparisons: (Shift Scenario) 4SD TOPLOADER
FREEWAY SPEED: Vehicle with 33 in tires and 3.50 axle gear ratio. 4th gear (1.0:1) Vehicle speed Vehicle Rpm 55 1961 65 2318 70 2496 75 2674 80 2853 85
3031 Gear MPH RPM RPM Drop MPH RPM RPM Drop 1st 39.78 4000 49.7 5000 1223 1529 2nd 39.78 2777 ↓ 49.7 3471 ↓ 57.3 4000 71.6 5000 1181 1477 3rd 57.3 2819 ↓ 71.6 3523 ↓ 81.32 4000 102 5000 1059 1324 4th 81.32 2857 ↓ 102 3676 ↓ Trans ratios 3.50 axle gear ratio (Dana 20 2.34:1) Gear Ratio Final
drive ratio HR Final drive ratio LR 1st 2.78 9.84 23.03 2nd 1.93 6.83 15.98 3rd 1.36 4.81 11.26 4th 1.0 3.5 8.19 4SD OD Toploader
FREEWAY SPEED: Vehicle with 33 in tires and 3.50 axle gear ratio. 4th gear (1.0:1) Vehicle speed Vehicle Rpm 55 2044 65 2416 70 2602 75 2787 80 2973 85
3159 Gear MPH RPM RPM Drop MPH RPM RPM Drop 1st 26.5 4000 33.1 5000
1590 1984 2nd 23.5 2413 ↓ 33.1 3015 ↓ 44 4000 54.9 5000
1950 2449 3rd 44 2044 ↓ 54.9 2551 ↓ 86 4000 107 5000
810 1000 4th 86 3196 ↓ 107 4000 ↓ Trans ratios 4.56 axle gear ratio (Dana 20 2.34:1) Gear Ratio Final
drive ratio HR Final drive ratio LR 1st 3.25 14.82 36.46 2nd 1.96 8.94 21.99 3rd 1.0 4.56 11.26 4th 0.80 3.65 8.98 |