Saginaw GMT Steering Gearbox 16:1 Variable Ratio For 1987-2000 GM Trucks/SUVs

$ 695.00 plus $125.00 Core deposit

2 reviews


IMPORTANT NOTE: There is a Core charge of $125 that is included in the price of this product. If you return your Core to us, we will refund a portion of this product total. The portion refunded will depend on the quality of Core you are delivering to us. View our core values and policies.

SHIPPING LABEL: We can usually supply a shipping label for approximately $25 (depending on your address) for you to send your core to us. Please call 661-568-9170 to arrange.

Total Price: $820.00


Product Details

This is a GM Truck and SUV gearbox that uses the 3 bolt “Triangle” mounting pattern. It is typically found on 1987-Present Chevy’s and GMC’s. It came in multiple variations. When ordering you will need to know the following information:

Piston Bore Size

There is a casting number on the housing of the gearbox (Either 83 or 84). 83 is a “small bore” (GMT400). 84 is a “big bore” (GMT800). Most of the time: 1500 2X4, 1500 4X4 and 2500 2X4 use the small bore, and 2500 4X4, 3500 2X4 OR 4X4 use the big bore, but there are some exceptions.

Blind Spline

Most vehicles use a sector shaft with 3 Blind Splines, but some (usually Diesels) have 4 Blind Splines. You will need to know which you have.

End Cap Number

Some models of vehicles have different internal stops to limit steering travel. There is a number on the end cap that will let us know what stops you need.

It is also a good idea to verify your input shaft type. 1987-2000 should have a 3/4-30 splined input shaft and 2001 to present use a DD input shaft. Some models around the 2001 switch over may not follow these guidelines.

If you have all this information you can go through the pick boxes and order the gearbox you need. Your other option is to send your existing gearbox to us and have it rebuilt.


  • 16:1 Variable Ratio
  • 3 bolt "V" mounting pattern
  • 18mm Metric O-ring pressure fitting
  • 16mm Metric O-ring return fitting
  • 3/4-30 spline input shaft
  • 25# Valve Weight


  • Piston Bore: Choose small or big bore
  • Blind Spline: Choose 3 or 4
  • End Cap Number: Fill in with your number
  • Billet End Cap
  • Billet Top Cover with Needle Bearing
  • 3 Bearing Kit: Includes Billet Top Cover w/needle bearing, mid bearing, bottom bearing, sleeve, o-ring and labor to bore housing
  • Ram Assist Ports: Includes open porting of valve to allow more flow that is needed when using a hydraulic ram
  • -6 AN Fittings Installed


This product will be shipped between 5-7 business days from when order is placed.


12 Month Limited Warranty Against Manufacturer Defects. View our full warranty details.

Return Policy

Items may be returned within 30 days of purchase. Your original order receipt should be included in the return box. Items should be sent using the original packaging. Upon receipt of your return, we will ensure all items are undamaged, and issue your refund.

    Customer Reviews
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    United States United States

    Fantastic Gearbox

    After 2 bad gearboxes from well known part stores. Went with one from Lee. Couldn’t be happier. Highly recommended!

    Russell P.
    United States United States

    This steering box is the bomb!

    I did my research for about 6 months on who to buy a steering box from for my 1989 Chevy K1500. Red head, blue head, Autozone, Orilleys, NAPA, AGR Steering etc. You know what they all had in common?? Poor reviews, bad customer service, leaky boxes out of the box and on an on. I could find nothing but praises for Lee Steering. I called several times and spoke with them about my particular situation and they were nothing but super helpful. Yea they may be a little more than the others but I can tell you the box was better than a new one. Even how they shipped the unit was impressive. You can tell that they take pride in what they build and pack the box to survive the shipping companies. I did an install video on my Youtube channel Check it out and see first hand what one looks like and how I installed it. Super happy and yes I would buy another one if needed.