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3-Speed Transmission Low Gear Sets
ATI offers Low Gear Sets for most popular 3-speed transmissions.
These gears are an excellent alternative to steep rear
end gears for street driven performance vehicles and low
RPM, high torque race engines.
These low gear sets increase the gear ratio to leave the
starting line and go back to the original rear gear in
high gear. The Increase is usually equal to 1 numerically
higher gear ratio.
All gear sets have weight restrictions. Consult your ATI
technician.
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Turbo 350 - 2.75 Low Gear Set
Low gear sets increase the starting line ratio when launching. A car with a 4.10 rear gear and a standard low gear of 2.48 equals a 10.16 starting line ratio or, “SLR” (2.48 x 4.1). Utilizing the 2.75 gear set equals an 11.30 SLR (4.1 x 2.75). The new SLR 11.30 divided by the old low gear of 2.48 equals 4.54 - the new rear gear required to obtain the 11.30 SLR with the 2.48 low gear. Great for heavy street cars and big CID high torque motors that are RPM limited and are using a 3.73, 3.90 or 4.10 rear gear. The low gear change will NOT change your trap RPM!
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Description |
Part
No. |
Price |
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2.75 RATIO |
354040 |
$484.05 |
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Turbo
400 - Low Gear Sets
Do you need less or more starting line ratio (SLR) than you have now? Always spinning the tire or hitting the bar too hard? Ask about changing the low gear in your transmission. This change will not affect the Trap RPM! SLR is found by multiplying your rear gear by your low gear. The OEM T400 is 2.48 (2.48 x 4.10 = 10.16). If your car is heavy and sluggish in 60 feet, think about a 2.56 low gear or a 2.75 (2.75 x 4.10 = 11.30) which will make your car feel like a rocket! If you are constantly spinning the tire, think about less SLR (2.10 x 4.10 = 8.61 and calm the car down! Ask your Sales Tech for more information.
The 6 pinion side of the gear set features a lightweight, billet aluminum carrier and with 6 gears you have added 2 extra gears to reduce the load. The 404210 is a 100% new gear set with a 1-piece sun tube and sun gear as well as all new billet steel reaction carrier and sprag race!
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Description |
Carrier |
Part
# |
Price |
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2.75 LOW GEAR SET - STRAIGHT CUT, 6 PINION |
STEEL |
404275 |
$1499.00 |
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2.10 LOW GEAR SET - STRAIGHT CUT, 6 PINION |
STEEL |
404210 |
$2995.00 |
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2.48 OUTPUT CARRIER - HELICAL, 5 PINION
Lightened by 1.1 LBS |
STEEL |
404001 |
$929.00 |
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2.48 REACTION CARRIER - HELICAL, 5 PINION - NEW OEM GM T400 / 4L85E |
STEEL |
404101C |
$699.00 |
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1.48 REACTION CARRIER - HELICAL, 5 PINION Lightened by 1.2 LBS - 2 Speed only! |
STEEL |
404101 |
$849.00 |
All gear sets have weight restrictions. Consult your ATI
technician. T400 aftermarket gear sets require a
special snap ring when used in 1965 to
approximately 1967 case applications
Turbo 400 - Aluminum Reaction Carrier
Carrier only - no gears included
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Description |
Part
No. |
Price |
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CARRIER ONLY
CARRIER - 800 HP MAX - INCLUDES BAND |
407070
404020
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$403.03
$494.10 |
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