 | Transmission and Final Drive Parts
Applied GMC 3.70, 3.55, & 4.10 Final Drive Assemblies
6 Year, 70,000 Mile Complete Warranty
Over 700 Units Running; Never a Gear Failure!
- These gears fit Oldsmobile Toronado and Cadillac Eldorado 1965-1978
- Units are heat treated and certified; material is SAE 8620
- If you are pulling a car it is a must to have the 3.55, 3.70, 4.10 gear ratios
- Maximum torque is achieved at 2,500-3,000 RPM
- These gears will help hold your coach from coasting down hills and save braking on long grades
- These gears allow those with a 403 CID engine the ability to keep up with a 455.
We pay for freight, reasonable labor charges and return freight. No one else offers this strong and simple of a warranty!
| ENGINE RPM at ROAD SPEED | GEAR TEETH |
|---|
| Final Ratio | RPM at
50MPH | RPM at
55MPH | RPM at
60MPH | RPM at
65MPH | RPM at
70MPH | RPM at
75MPH | Pinion
Gear | Ring
Gear |
|---|
| Original | 3.07 | 1900 | 2090 | 2280 | 2470 | 2660 | 2850 | 14 | 43 |
| 3.42 | 2125 | 2350 | 2550 | 2760 | 2980 | 3150 | 12 | 41 |
| 3.55 | 2200 | 2420 | 2640 | 2860 | 3080 | 3300 | 11 | 39 |
| 3.66 | 2274 | 2500 | 2730 | 2955 | 3183 | 3412 | - | - |
| 3.70 | 2300 | 2530 | 2760 | 2990 | 3220 | 3450 | 10 | 37 |
| 4.10 | 2500 | 2750 | 3000 | 3250 | 3500 | 3750 | - | - |
| Above figures were derived from various methods. Tires: 8.75 x 16.5 or 225/75 x 16 |
- 70% of our customers claim to have more power, and same mileage.
- 20% of our customers claim to have more power, and better mileage.
- 10% of our customers claim to have more power, and less mileage.
(85% of those claiming less milage had ignition or carburetor problems)
FAQs:
- Will my gas milage suffer?
- Overall driving average would result in same milage or better than before since the distributor vacuum advance will advance more and carburetor will deliver leaner mixture.
- Why should I purchase the 3.55 and not the 3.42?
- If you are going to get the most for your money, the 3.55 gives you better performance. GMC also had a 3.54 ratio on the drawing board. 3.42 ratio is a standard ratio for General Motors. Yes, you can put lower ratio in the original case than the 3.42. Our 3.55 is a 3.5454 ratio. 3.42 ratio when used with 16" rim will generally not perform better than 3.55. Only the 3.55 and 3.70 have the full 4-year warranty.
- Are the teeth on the 3.55/3.70 thinner?
- Our gears are as thick as our competitor and backed up by 6-year, 70,000 mile warranty.
- Isn't the 3.50 ratio less expensive?
- No, by the time you drop the transmission and work on the transmission, the labor cost has driven the overall cash outlay higher. Also the gear reduction is done by speeding up the 1/2 of the transmission which causes more stress on the clutch pack. Temperature of the transmission does not drop as much as those with 3.55/3.70.
- Why not the 3.66?
- Cost for the additional final drive of 3.21 will cause cash outlay of over $600.00.
Final Drive Parts & Accessories
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