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Shift Table Calculator

Road speed over engine RPM in every cell, throttle across the top — the grid and the curve in one window. Type into either number and the other follows. This is a planning tool, not a tune — book a session to get it dialed in.

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Driveline Setup

Tire Size
Diameter in
Width mm
Aspect
Rim in
ring & pinion ratio
Model
Gear set
4 forward gears
rpm — graph marker & autofill top
rpm at WOT — flags shifts that land under it
% — converter slip, raises engine rpm
Tick every gear the converter may lock in. Slip goes to zero once the clutch is in, so the rpm above that speed is the real engine speed.
MPH after shift to lockup
Auxiliary overdrive bolted behind the gearbox. Every ticked gear gains an over ratio — 1st, 1st-over, 2nd, 2nd-over and so on.
TPS Axis Autofill shift rpm to · drop · floor

Shift Speed vs. Throttle Position

every cell — mph over rpm
Table is consistent.

Shift Curve

Plot
Highlight

WOT Shift

Set every shift to rpm

Move It In & Out

format as

Driveshaft Critical Speed

the rpm the shaft starts to whip
Tube
Length in
Tube OD in
Wall in
Material
Length is between the U-joint centers, not end to end. A two-piece shaft on a carrier bearing is two short shafts — measure one section.
RPM = MPH × 336.135 × gear ratio × final drive ÷ tire diameter  ·  MPH = RPM × tire diameter ÷ (336.135 × gear ratio × final drive)  ·  converter or clutch slip divides engine rpm by (1 − slip)