• QUESTIONS? GIVE US A CALL! 1 (765) 378-4908

    Open Monday - Friday 9A-4:30P EST

    We're closed on major holidays.

  • Harness order lead time is estimated to be 8-10 weeks from date of purchase.

    All other items typically ship within 3-5 business days unless specified otherwise.

Navigate to the Speartech Fuel Injection Systems homepage

LS and LT Retrofit Specialists
Call to order today

Questions

Frequently Asked Questions

See our list of FAQ's on the right. If you have any other questions please contact us via phone or email.

Do you offer plug and play swap harnesses for specific vehicles?

No, we only offer standalone harnesses for GM '99-newer LS/LT engine and transmission harnesses.

Why don't you stock harnesses?

All of our standalone harnesses are custom build-to-order to match your specific setup. Our goal is to have a form fitted harness and eliminate any possible extension or adapter harnesses from 3rd parties.

Can I request a refund?

Standalone wiring harnesses, bench top programming harnesses, and computer flashing is non-refundable. Select other products may be returnable for a 15% restocking fee if these items are *NEW* condition only. We don't accept used or modified products to be returned. Contact us for more details.

Do you charge sales tax on any items?

Sales tax is dependant upon your state of residence. If sales tax applies to your state, you will see the amount in the checkout before you place your order.

Do you offer standalone transmission controllers?

No, we only make new standalone wiring harnesses that are compatible with your specific engine and transmission combination. We don't offer standalone transmission controllers like Compushift, MSD, US Shift, etc.

Do you ship outside of the USA?

Yes, we can ship outside of the USA. You must use our contact form or phone in the order. The website will not allow international orders to be placed.

Do you support T93 TCM's?

Yes, we've been supporting T93 controllers since March of 2023! The 2nd Gen 10L transmissions are supported with a Speartech harness.

Will I need a tune after you program the computer?

It's possible that you may need a local tuner or a remote tuner to dial in your specific setup. A swap is like a fingerprint, every engine behaves a little different from another.