Hyundai Santa Fe Seat Extension Modification

Installer: Numerous Members
Testers: Numerous Members
Part supplier: Local Hardware store
Author, Images: scs00, alphanstein, SwaveDave, leedef, twospirits

Introduction / History

The drivers seat in the Santa Fe gives adequate leg room for most drivers by sliding both forward and rear on its sliding rails. But there are some that would like to have even more leg room and therefore this seat extension modification addresses this issue. The modification can be accomplished by one of the two ways outlined below.
Modification version 1
adds extra leg room by way of adding metal extensions to the seat rails. This type of modification was first suggested and performed by numerous Santa Fe Forum members.
Modification version 2
adds extra leg room by removing the tabs off the seat rails.

Disclaimer

Please Read the disclaimer before proceeding

Modification Version 1 - Adding Metal Extensions

Difficulty level / scale: On a scale of 1 - 10 

Easy  Modification Version 1 Difficult
1 2 3 4 5 6 7 8 9 10
            X      

Tools and materials needed: (Modification version 1 - Adding Metal Extensions)

 01)  1 1/4" wide x 3/8" thick cold rolled steel (15" long)  
 02)  1 1/4" wide x 3/8" thick cold rolled steel (18" long)
 03)  Sanding paper
 04)  Primer
 05)  Black paint
 06)  Dremel Tool
 07)  5/16"-18x1" Steel bolts (316 alloy)
 08)  5/16"-18x1" Steel Alloy screws (316 alloy)
 09)  5/16" Star lock washers
 10)  5/16" Spring lock washers
 11)  5/16"-18 and 17/64" height, 1/2" width nuts (alloy 20 steel)

Time to perform modification version 1:

Total time for mod version 1: 4 Hours  

The following mod steps were first outlined in the Santa Fe Forum by members scs00 and alphanstein and these are their instructions. The original text can be viewed on the Santa Fe Forum in the Install/How To?FAQ's section if it is still available. I condensed the thread to only their mod text below.

Posted by alphanstein on 12/07/2001.
I too used 1 1/4" wide and one 15" and one 18" rail at 3/8" think for a stronger hold. I used cold rolled steel and sanded, primed and painted them black.
I took the existing holes and moved them down the rails by 2". It meant i had to drill two sets of holes in the front on both steel bars. In the rear, I just drilled the same mounting holes for the rear mounts, but this meant I had to drill new holes in the seat sliders, which was no problem. You can see how in the rear, the seat sliders hang back a little, hence drilling the new holes 2"forwards to align them back with the floor mounts. I had to dremel out the holes in the rear to ensure they were not torquing the bar like they did on my first attempt. i also need to replace the cheap zinc screws I got from Home Depot with some real steel alloy screws that I got from mcmastercarr.com. The zinc ones do not stand up to torquing.
I am using 5/16"-18 x 1"steel bolts (316 alloy) as replacements with spring lock washers on the nut side and star lock washers on the bolt side (both 5/16"). The nuts are 5/16"-18 and 17/64" height, 1/2" width (alloy 20 steel).

The total mod with painting took me about 4 hours. But the leg room that comes with and additional 2 inches on the rails. I put the seat all the way back and I can still fit in the rear behind the drivers seat, albeit my legs are open, but still comfortable. (Photo by alphanstein)

Modification Version 2 - Removing Seat Rail Tabs

Difficulty level / scale: On a scale of 1 - 10 

Easy  Modification Version 2 Difficult
1 2 3 4 5 6 7 8 9 10
        X          

Tools and materials needed: (Modification version 2 - Removing seat rail tabs)

 01)  1 1/4" wide x 3/8" thick cold rolled steel (15" long)  
 02)  1 1/4" wide x 3/8" thick cold rolled steel (18" long)
 03)  Sanding paper
 04)  Primer
 05)  Black paint
 06)  Dremel Tool
 07)  5/16"-18x1" Steel bolts (316 alloy)
 08)  5/16"-18x1" Steel Alloy screws (316 alloy)
 09)  5/16" Star lock washers
 10)  5/16" Spring lock washers
 11)  5/16"-18 and 17/64" height, 1/2" width nuts (alloy 20 steel)

Time to perform modification version 2:

Total time for mod version 1: 90 min (If applying epoxy, then add overnight time as well). 

The following mod steps were first outlined in the Santa Fe Forum by members SwaveDave and enhanced by numerous other members such as leedef, onigorishi and others. I condensed the thread to only their mod text below.

Step 1 - Move the seat out of the way.

Move seat up all the way forward on its track which will expose the rear metal stops toward the back portion of the rails. There are two on each rail and stick up about 1/8" beyond the top surface of each rail. (Photo by twospirits)

Step 2 - Identifying the sections to work on.

There are two tabs on each rail and stick up about 1/8" beyond the top surface of each rail. (Photo by leedef)
 
Another view of the two tab stops as well as the plastic end stop caps.
(
Photo by twospirits)

Step 3 - Removing the tab stops.

Cut off the tabs so they are level with the top of the rail. You can cut them off by using a hacksaw, power saw but its best using a dremel tool. File them down to the reach of the level of the rail, if need be. Use a regular flat file, or a round drill attachment file. (Photo by twospirits)

Step 4 - Clean and prime the area.

Clean up the little metal filings you made on the rails with a fine grinding wheel (again using a dremel tool) and wipe off any dirt on the rails.
You will notice that once the tabs are cut off that there is a small hole through the rails. You will need to close this hole or risk having some of the white ball bearings fall through the hole and make the front and back movement of the seat feel rough. (suggested by leedef)
(
Photo by twospirits)

Step 5 - Closing the exposed hole.

Filing in the holes is easy using epoxy. The epoxy SFF member leedef used is your regular, two part epoxy (Elmer's), which you mix equal portions (little fingernail size blobs) mixing them thoroughly and glob into the track holes. Let it dry overnight, then gently ground (file) it down. He also applied a second coat and again smoothed it out. Finish it off by sanding it down with fine sandpaper.

At this point spray (fast drying) metal primer on the areas you worked on. After its dried, use spray gloss black paint and allow to dry. (Note: Make sure you use masking tape around the seat, middle console and carpet area so you do not mess them up when spraying).  
(
Photo by leedef)

Step 6 - Final steps and testing.

Once the paint has dried, apply a thin layer of grease (spray type or gel type in a tube) to the tops of each rail.
(See above photo)
Slide the seat back a little, so you can remove the plastic fastener which holds some wires located underneath the seat. Removing the fastener allows the wires more freedom to stretch if you decide to move the seat way back.
Now sit in the seat and move the seat back as far as it will go a few times. Go back and forth a few times so the grease on the rails gets spread thoroughly.
Choose a spot that is most comfortable for you and make sure the seat mechanism snaps into the rail teeth so the seat cannot be shifted once you choose the best position for your legs.

Further extension (for the really tall person).

If performing the above steps still has you craving for more legroom, you can still move the seat further back by removing the plastic end caps at the end of the seat rails. Note: Doing so will increase the legroom by another 2-4 inches but would restrict any possible person to sit comfortably behind the driver as well as possibly have the white ball bearing slip out if the seat is pushed too far back. Use your discretion in this. If you still want to do it then to remove the plastic end caps is quite easy since they are plastic. You can use a screwdriver and hammer. They will knock off quite easily.  
(
Photo by twospirits)

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This site was last updated 06/10/05