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Tuff Stuff Performance High-Amp Output Alternators

4.49 out of 5 stars 288 Customer Reviews

A Tuff Stuff Performance high-amp output alternator is just what every ride needs. These units produce the most power at idle to keep your battery fully charged at all times. Tuff Stuff products are hand-built with the best bearings, diodes, and copper windings available. The alternators are available in a variety of amperages, case and pulley styles, finishes, and with internal or external regulator. Order the model designed for your specific vehicle application.

Results 1 - 25 of 32

Alternator, One-Wire, GM 10si Case Style, 12 V, 140 amps, Chrome, Serpentine Pulley, Buick, Chevy, Pontiac

Part Number: TFF-7127NK6G

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, Chrome, 100 amps, 1-wire, V-Belt, GM, Each

Part Number: TFF-7127ND

4.38 out of 5 stars ( 13 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, 140 Amp, Replacement, V-Belt, Chrome, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127NK

4.68 out of 5 stars ( 19 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, Polished, 100 Amps, V-Belt, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127NDP

4.53 out of 5 stars ( 17 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, One-Wire, GM 10si, 12 V, 100 amps, Polished, Serpentine Pulley, Buick, Chevy, Oldsmobile, Pontiac

Part Number: TFF-7127NDP6G

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 140 Amps, Polished, V-Belt Pulley, Each

Part Number: TFF-7127NKP

3.5 out of 5 stars ( 8 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 100 Amps, Black Wrinkle Powdercoated, V-belt Pulley, Each

Part Number: TFF-7127NFBWDP

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, One-Wire, GM 10si Case Style, 140 amps, Black Chrome, Serpentine Pulley, Buick, Chevy, Pontiac

Part Number: TFF-7127NK6G7

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 140 Amps, Black Wrinkle Powdercoated, V-belt Pulley, Each

Part Number: TFF-7127NKBWDP

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternators and Generators, High-Amp Output Alternators, GM 10si Case Style, 12 V, 100 amps, Orange Powdercoat, V-belt Pulley, Chevy, GMC, Jeep, Each

Part Number: TFF-7127NFORANGE

5.0 out of 5 stars ( 2 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternators and Generators, High-Amp Output Alternators, GM 10si Case Style, 12 V, 140 amps, Polished, Serpentine Pulley, Buick, Chevy, GMC, Jeep

Part Number: TFF-7127NKP6G

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 2/16/2026 if shipped by air

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Estimated Ship Date: Monday 2/16/2026 if shipped by air

Alternator, 65 Amp, Replacement, V-Belt, Chrome, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127NJ

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Chrome, 80 Amps, Serpentine, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127NB6G

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 100 Amps, Gray Powdercoated, V-belt Pulley, Each

Part Number: TFF-7127RATGRAY

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 100 Amps, Chrome, V-Belt, Each

Part Number: TFF-7127ND9

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Chrome, 80 Amps, V-Belt, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127NB

4.5 out of 5 stars ( 2 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, 140 Amp, Replacement, V-Belt, Black Chrome, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127NK7

3.67 out of 5 stars ( 3 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 100 Amps, Red Powdercoated, V-belt Pulley, Each

Part Number: TFF-7127NFBW

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternators, High-Amp Output, GM 10SI/10DN/12SI, 12 V, 100 amps, Blue Powdercoated, V-belt, Buick, Cadillac, Chevy, GMC, Jeep, Olds, Pontiac, Each

Part Number: TFF-7127NFBLUE

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 100 Amps, Red Powdercoated, V-belt Pulley, Each

Part Number: TFF-7127NFRED

5.0 out of 5 stars ( 2 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Chrome, 100 Amps, Serpentine, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127ND6G

4.67 out of 5 stars ( 6 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Performance, High Amp, GM 10si Case Style, 12 V, 100 Amps, Yellow Powdercoated, V-belt Pulley, Each

Part Number: TFF-7127NFYELLOW

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Black Chrome, 100 Amps, Serpentine, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: TFF-7127ND6G7

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternators, High-Amp Output, GM 10SI/10DN/12SI, 12 V, 100 amps, Red Powdercoated, V-belt, Buick, Cadillac, Chevy, GMC, Jeep, Olds, Pontiac, Each

Part Number: TFF-7127RATRED

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today

Alternator, Replacement, GM 10si Case Style, 6 V, 65 amps, Chrome, V-belt Pulley, Each

Part Number: TFF-7127NG

Not Yet Reviewed

Estimated Ship Date: May 14, 2026 if ordered today

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Estimated Ship Date: May 14, 2026 if ordered today