Yukon Gear Ford 9in Differential Dropout Assembly 31 Spline 3.70 Ratio

SKU: YUKYDAF9-370-31

Differential

YUK Drop Outs

Yukon Gear & Axle

Yukon Gear Ford 9in Differential Dropout Assembly 31 Spline 3.70 Ratio

SKU: YUKYDAF9-370-31

Differential

YUK Drop Outs

Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

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Description

Yukon dropout assemblies are built by expert Yukon technicians and come complete, properly shimmed and backlashed to spec. All you do is install the third member into your diff housing, bolt on the diff cover, add fluid, and roll. This unit features a nodular iron case which improves rigidity and power handling, reducing deflection for consistent gear contact and a long service life.

Product Overview

Features and Benefits

Fits Ford 9â€ differential
3.70 gear ratio
Fits Ford 9 in. Differential
Complete, fully assembled dropout
31 spline
Does not include yoke
Complete; Fully Assembled Dropout

Product Details

AAP Selling Package Quantity UOM:	EA
AAP_UDA_12:	EA
AAP_UDA_22:	1
Axle Shaft Spline Quantity:	31
California Proposition 65:	WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
Color:	Bare
Description:	Yukon Dropout Assembly for Ford 9in. Differential; 31 Spline; 3.70 Ratio
Finish:	Raw
Gear Ratio:	3.70
Grade Type:	Performance
Material:	Nodular Iron
Mounting Hardware Included:	No
Mounting Hole Quantity:	10
Part Number:	yukYDAF9-370-31
Pinion Yoke Included:	No
Title:	Yukon Dropout Assembly for Ford 9” Differential, 31 Spline, 3.70 Ratio
Type:	Non Locking
WARNING CA Proposition 65 Message:	WARNING: This product can expose you to chemicals including arsenic; which is known to the State of California to cause cancer. For more information; go to www.P65Warnings.ca.gov.
WARNING CA Proposition 65:	Yes

Application Summary

9" FORD 3.70 RATIO w/ 31spl STD CARRIER, 3RD MEMBER ASSEMBLY (w/o Yoke)

Part Type

Differential

Data: v4.2 - Upd: 2026-10-13 08:07:41

Features

3.70 gear ratio
31 spline
Complete, fully assembled dropout
Complete; Fully Assembled Dropout
Does not include yoke
Fits Ford 9 in. Differential
Fits Ford 9” differential

Specifications

AAP Selling Package Quantity UOM:: EA
AAP_UDA_12:: EA
AAP_UDA_22:: 1
Axle Shaft Spline Quantity:: 31
California Proposition 65:: WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
Color:: Bare
Description:: Yukon Dropout Assembly for Ford 9in. Differential; 31 Spline; 3.70 Ratio
Finish:: Raw
Gear Ratio:: 3.70
Grade Type:: Performance
Material:: Nodular Iron
Mounting Hardware Included:: No
Mounting Hole Quantity:: 10
Part Number:: yukYDAF9-370-31
Pinion Yoke Included:: No
Title:: Yukon Dropout Assembly for Ford 9” Differential, 31 Spline, 3.70 Ratio
Type:: Non Locking
WARNING CA Proposition 65 Message:: WARNING: This product can expose you to chemicals including arsenic; which is known to the State of California to cause cancer. For more information; go to www.P65Warnings.ca.gov.
WARNING CA Proposition 65:: Yes

Reference Information

Brand Name/s	Yukon Gear & Axle
StreetFX SKU	yukYDAF9-370-31
SFX Item ID	4492597
Supplier Item Code	4492597
Manufacturer SKU	YDAF9-370-31
Manufacturer UPC	883584132141
Alternative References	9in