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Transmission Input Shafts
 The
Torsional Input Shaft works like a torsional spring bar,
twisting and returning to totally eliminate breakage while
reducing shock loads to the gear train. Designed to fit
either the Powerglide or TH400 splines, these shafts are
available for V8 and 6-cylinder carriers.
In addition to our precision-machined torsional shafts
for PG, TH350 & TH400, Ford C-4, C-6 and AOD, we offer
special extreme-duty models for the PG and TH400 made
of Vasco steel. This material is exceptionally strong
and resilient to withstand the most severe torsional shock.
WHAT YOU GET
FOR YOUR MONEY
Raw material cost for mill run
Approximately 7000 feet per order:
4340 steel
300M
Vasco |
$0.52 / in
$2.42 / in
$11.50 / in |
Based on 1.125” diameter material
Pricing as of Aug 2025 |
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Our Super Shaft (#207148 - Patent #6,892,533)
is the only ringless Powerglide input shaft that still
provides the OEM lube circuit to properly lubricate your
transmission and maintain proper converter charge pressure
for peak performance. Machined form 315,000 PSI tensile
strength steel alloy in full 1" diameter. Requires
special stator support tube. ATI Ringless Input
Shafts MUST be used
with ATI Pumps. Other
manufacturers use
bushings that will
not work with ATI
Input Shafts creating
improper sealing
which results in
loss of converter
charge, pressure and
lubrication.
GM Powerglide Input Shafts
| GM
Powerglide |
Part # |
Price |
Purchase |
| 12 7/8" - PG SPLINE - 1.76 - 300M |
|
$249.50 |
|
| 12 7/8" - TURBO - 1.76 - 300M - NO JOURNAL |
|
$219.12 |
|
| 12 7/8" - TURBO - 1.76 - VASCO - NO JOURNAL |
|
$384.50 |
|
Ringless Super Shafts
ATI’s Patented Ringless Shaft and Stator Support Tubes use actual
rings to seal nearly 100% of flow while bushings seal only 85% of your
cooler flow. Lost cooler flow is wasted horsepower to make the pressure! Lost converter charge pressure means more slip at the top
end and a less efficient converter!
ATI Ringless Input
Shafts MUST be
used with ATI Pumps.
These ringless shafts
are patented by ATI.
Other manufacturers
use bushings that
will not work with
ATI Input Shafts
creating improper
sealing which results
in loss of converter
charge, pressure and
lubrication. |
|
Zero broken in 8 seasons!
36% larger!
ATI’s Superglide 4
features a 1.1875”
diameter ringless
shaft that is 36%
larger
in diameter
than a stock
Powerglide input! |
| GM Powerglide |
Part # |
Price |
Purchase |
| 12 7/8" - 1.76 - VASCO RINGLESS
SUPER SHAFT - TURBO SPLINE |
|
$359.47 |
|
| 12 7/8" - 1.76 - RINGLESS SUPER SHAFT II -
1.0012" DIAMETER, VASCO |
|
$394.50 |
|
| INPUT SHAFT - SUPERGLIDE 4 - RINGLESS - THE BIG
SHAFT "SG4" |
|
$347.62 |
|
| INPUT SHAFT - SUPERGLIDE 4 - RINGLESS - THE BIG
SHAFT "SG4" - VASCO |
|
$581.29 |
|
| Input Shaft Components |
Part
# |
Price |
TEFLON RINGS - SET OF 2
TEFLON RING (1 RING)
STATOR SUPPORT BUSHING - .984 NON-ATI SHAFTS FOR NON-BUSHED CONVERTERS
STATOR SUPPORT BUSHING - .998 NON-ATI SHAFTS FOR NON-BUSHED CONVERTERS
|
205010T
205011T
207350
980080
|
$7.95
$3.99 EA
$11.30
$5.97
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Why is a well made, straight and correct input shaft important?
Input shafts serve many purposes including:
- Transfer power from the converter to the input sun gear while in low gear.
- Transfer power from the converter to the high gear hub in high gear.
- Direct oil coming from the converter to the front ring on the shaft and out through the pump to the oil cooler.
- Direct oil from the cooler between the 2 rings and down through the center of the shaft to lube and cool the direct clutches, gear set, output shaft bushing and the entire transmission.
- Maintain proper oil pressure in the converter and cooler with its sized holes that are “downstream restrictions” to control the flow out of the converter.
- Center and support the Input Sun Gear from its pitch diameter to the ½ diameter that goes into the bushing on the output shaft
- Center and support the Output Sun Gear (flange gear) via the “wedding band”.
Which companies in the industry are capable of making input shafts properly? Who has the hobs, shapers and cutters to cut splines? Do they have the machines and the expertise that is required to manufacture this critical part? Can they properly heat treat it, straighten and finish grind it? Or, do they just buy it from someone and resell it? One thing is for sure: at ATI, if we have a problem, we have a REASON, not an EXCUSE, because we make it in-house from start to finish. We find the problems, not you. The bottom line is simple: Manufacturing technique for this product is critical. Material is critical. Heat-treat is critical. |
| GM
TH350 |
Part
# |
Price |
350 INPUT SHAFT 300M TURBO SPLINE
|
357052
|
$309.00
|
| GM
TH400 - OEM Diameter |
Part# |
Price |
300M - OEM - STEEL FWD DRUM OVERSIDE DRUM SPLINE - NO PISTON
300M - OEM - L/W 1045 STEEL FWD DRUM W/ ALUM PISTON
300M - OEM - 4140 HT L/W STEEL FWD DRUM W/ ALUM PISTON
300M - OEM - ALUMINUM FWD / STEEL INSERT - NO PISTON
|
406000
406008
406007
406004
|
$349.95
$499.00
$519.00
$849.00 |
VASCO - OEM - STEEL FWD OEM DRUM OVERSIZED DRUM SPLINE - NO PISTON
VASCO - OEM - 1045 L/W STEEL FWD DRUM W/ ALUM PISTON
VASCO - OEM - 4140 L/W HT STEEL FWD DRUM W/ ALUM PISTON
VASCO - OEM - ALUMINUM FORWARD DRUM W/ STEEL INSERT |
406001
406009
406006
406005 |
$529.00
$619.00
$659.00
$829.00 |
| GM
TH400 - 1-3/16" Diameter |
Part# |
Price |
300M - BIG - LIGHTWEIGHT STEEL FWD / ALUM PISTON DRUM
300M - BIG - ALUM FWD / STEEL INSERT DRUM |
406002
406003 |
$519.00
$849.00 |
VASCO - BIG - ALUM FWD / STEEL INSERT DRUM
VASCO - BIG - LIGHTWEIGHT STEEL FWD / ALUM PISTON DRUM |
406003V
406002V |
$799.00
$619.00 |
| GM
TH400 Intermediate Shaft |
Part# |
Price |
300M - INTERMEDIATE
VASCO - INTERMEDIATE*
|
405971
405970V |
$309.00
$349.95 |
*Carries a 1 year warranty for up to 2000HP, ATI Clutch Hub #405370, #405371 or 405371B (for use with a bearing) recommended |
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|
|
| GM
4L80E/4L85E |
Part
# |
Price |
4L80E/4L85E INTERMEDIATE SHAFT - VASCO
|
705311 |
$349.95 |
4L80E/4L85E INPUT SHAFT - VASCO
|
705310
|
$689.00
|
|
|
|
| GM
4L60, 700R4, 4L65E |
Part
# |
Price |
4L65E INPUT SHAFT 300M - NO RELUCTOR - WITH CAPSULE
|
|
$324.95 |
4L60 & 700R4 INPUT SHAFT 300M - 30 SPLINE - LATE - WITH CAPSULE
|
|
$324.95
|
|
 |
|
8L90E Input Shaft
8L90E Vasco Input Shaft
| Applications |
Part # |
Price |
| 8L90E INPUT SHAFT - VASCO |
704000 |
$865.58 |
|
Ford Input Shafts
| Ford Inputs |
Part # |
Price |
| C6 INPUT SHAFT - 300M - 30 SPL TRANS / 31 SPL CONV |
606010 |
$279.00 |
| C4 INPUT SHAFT - 300M - 24 SPL TRANS / 26 SPL CONV - 70 & UP |
646030 |
$279.00 |
| C4 INPUT SHAFT - 300M - 24 SPL TRANS / 24 SPL CONV |
646031 |
$279.00 |
| E4OD - 4R100-5R110 INPUT SHAFT - 300M - LATE - SHORT - 30 & 31 SPLINE |
617404 |
$219.12 |
| AOD INPUT SHAFT - DAMPER STYLE - 300M - 23 SPLINE |
617405 |
$257.90 |
| 5R55 INPUT SHAFT - 300M |
646032 |
$249.00 |
| Identify the correct
input shaft for your Ford C4: |
| 1964-1969: 26 SPLINE TRANS |
24 SPLINE CONVERTER |
| 1964-1969: 24 SPLINE TRANS (EARLY - .788 FOR RESTORATION
ONLY/MILD PERFORMANCE) |
24 SPLINE CONVERTER |
| 1970 ONLY: 26 SPLINE TRANS |
26 SPLINE CONVERTER |
| 1971-UP: 24 SPLINE TRANS |
26 SPLINE CONVERTER |
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