12 products fit your

2003 Hummer H1

Add Engine

Show Direct Fit Parts

12 products

Clear All

Fitment

2003 Hummer H1

Department

Truck

Application

Truck Accessories

Transmission Family

700R4

Products

Related Articles

700R4 Transmission Complete Guide | Diagrams, HP Ratings, FAQ

700R4 Transmission Complete Guide | Diagrams, HP Ratings, FAQ

Read More

The 700R4 is a great choice when it's time to upgrade your classic car or truck with an overdrive transmission. Here's what you need to know about GM's famous 4-speed automatic.

How to Adapt LS Engine to 700R4 or Turbo 350 Transmissions

How to Adapt LS Engine to 700R4 or Turbo 350 Transmissions

Read More

We show you how to keep that old GM transmission when swapping in an LS engine. Our LS swap adapter kits make it easy!

241 Hemi Long Block Rebuild Part One

241 Hemi Long Block Rebuild Part One

Read More

Speedway Motors employee Tim M. has been chipping away steadily at his '29 roadster for awhile now. This time Tim tackles one of the big pieces, the long block rebuild of his 241 Red Ram Hemi.

Showing all 12 results

Customer Impersonation Script