SEI 1976-2015 Mercury 20" Lower Unit V6 135 150 + HP 2.0:1 Ratio 6 MO WTY

• This is an SEI Lower unit NOT OEM
• Pressure checked to 12 PSI
• NEW IMPELLER 
• 6 Month Warranty with return of spinning core

This lower unit does have a 2 to 1 gear ratio.  This unit shifts and spins smoothly with no binding.  The driveshaft appears to be in good condition with slight wear and the propeller shaft is straight.  The unit has not been opened but the oil was clean and free of any metal. It was pressure checked good with a new impeller installed. There are scuffs and scratches and small specks of missing paint that go along with everyday use that do not affect performance or integrity. This does have holes in the cavitation plate for a planing fin. There is nothing stopping this lower unit from being a great replacement! Please note that this is a SEI lower unit, not an OEM!  Purchase with confidence!

Please note that we drain all oil from this unit prior to shipping and you will be required to add oil prior to installation and usage.

Driveshaft measures - 21-3/4" - from the top of the waterpump housing to the end of the driveshaft
Driveshaft spline count - 8
Propshaft spline count - 15

General Information

• Professionally Inspected
• New Impeller
• Pressure checked to 12 PSI minimum
• Fully Resealed
• Shafts checked for straightness
• 6 month mechanical warranty

Criteria to validate your 6 month warranty:

• Core must be of equal or greater value
• Cannot be locked up - driveshaft must spin
• Up to 30 days from the date of purchase to send in your core
• Covers mechanical aspects ONLY
• Warranty begins from date of purchase

You will receive two copies of the terms and conditions for the lower unit 6 month warranty. One copy MUST be signed and returned with your core. Without a returned signed copy, the 6 month warranty will not be valid. 

Upon receipt of your core, we will inspect the unit to determine if it meets the criteria to validate the 6 month warranty. We reserve the right to accept or reject any core at our discretion. If you have any questions or concerns, please do not hesitate to contact us and we would be happy to help!

We offer a 30 day return policy on this product so you can purchase it with confidence. If you have any issues with the product, please reach out to us and we would be happy to help resolve any issue that may occur. Please be absolutely sure this is the correct one for your motor prior to purchasing.

Location: Southcentral Outboards, Altamont, Illinois

We have provided this cross-reference with the resources we have available in regards to fitment. This most likely will not fit every model for the years and horsepowers we have listed. We urge you to make sure this is the exact item you need by matching the part number to what is required for your motor. If you need help doing so, please contact us prior to purchasing and we would be happy to help!