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How to replace the GMT800 Intermediate Steering Shaft (ISS)


This is a discussion on How to replace the GMT800 Intermediate Steering Shaft (ISS) within the Tech How To forums, part of the TMC TECHNICAL category!
Here is a step-by-step write-up on how to replace the Intermediate Steering Shaft on a GMT800 SUV. I'm almost certain ...

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Old 08-29-2009, 08:28 PM
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How to replace the GMT800 Intermediate Steering Shaft (ISS)

Here is a step-by-step write-up on how to replace the Intermediate Steering Shaft on a GMT800 SUV. I'm almost certain this is exactly the same procedure for most GMT800 vehicles as the part is listed as being for use on all full size GMT800's from '99-'07.

The part number is: 19153614

I got mine from GMPartsDirect.com for $67 including shipping. This is the new greaseless design, not just a replacement.

http://www.gmpartsdirect.com/results...umber=19153614



I wasn't experiencing the dreaded steering clunk but I was noticing some pretty intense vibration of the steering shaft on rough roads. I'm a little OCD when it comes to squeaks, bumps and rattles so I decided to spend the money and the 20 minutes to knock this one out.

*********************************************************

The first thing I did was to make sure I was parked with the wheels and the steering wheel dead straight. This helps put the nuts and bolts that need removed in accessible positions.

NOTE: During this entire process you'll want to make sure that you do not rotate the steering wheel. It's not going to do any damage to bump it or nudge it a little but from what I understand, the SIR coil is limited in the number of rotations it can handle in either direction so you don't want the wheel to get spun while the shaft is unhooked.

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With everything now straight, I loosened the 15mm bolt in the lower portion of the ISS that is accessible inside the engine compartment. I did not remove it just yet as I wanted the lower half of the shaft to help hold the wheel stationary as I loosened the upper portion of the ISS that is connected under the dash.

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With the lower bolt loose but not removed, I climbed into the floorboard and used a 15mm socket to loosen nut holding the upper portion of the shaft in place.

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Now, with both bits of hardware loose, I went back into the engine compartment and separated the ISS from the lower shaft.

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I next went back under the dash and carefully removed the hardware and pulled the ISS down and back towards the firewall, spearating it from the base of the steering column.

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Now, with both ends disconnected, I pulled the OEM shaft through the firewall from the inside.

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Here's the old shaft.

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Here's the new one.

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With the old shaft out, I carefully worked in reverse to put the new shaft in place.



Voila, no more vibration!!!

This is super simple and completely worth the effort!
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Old 08-29-2009, 08:39 PM
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Good write up. It is applicable to the trucks too. The only difference with mine was that the gas pedal assembly needed to be unbolted and moved out of the way. Otherwise it's the same.
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Old 08-29-2009, 08:44 PM
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Good write up. It is applicable to the trucks too. The only difference with mine was that the gas pedal assembly needed to be unbolted and moved out of the way. Otherwise it's the same.
Cool! Good to know.
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Old 08-29-2009, 08:46 PM
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Great write-up and pics. It will help many people out. We can just refer people to this thread when they ask about ISS. Thanks!
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Old 08-30-2009, 10:34 AM
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Does this only cover half ton trucks? The reason I ask is that shaft looks A LOT different then the one in my 3/4 ton. The process for a 3/4 and 1 ton should be similar though right?
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Old 08-30-2009, 11:43 AM
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Does this only cover half ton trucks? The reason I ask is that shaft looks A LOT different then the one in my 3/4 ton. The process for a 3/4 and 1 ton should be similar though right?
According to RockAuto.com, this same part number is listed as a solution for the 2500HD.

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Old 08-09-2010, 11:19 AM
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I just got my new steering shaft in and installed it. Thanks for the write up. Piece of cake and no more clunk.
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Old 08-09-2010, 11:21 AM
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Old 11-15-2010, 10:57 PM
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Greaseless?

Greetings. I was reading your thread and that will be an easy job. My Tahoe is clunking in the steering column pretty good. Something you said at the beginning of your instructions was that you purchased a greaseless design. Does that matter to get rid of the clunking? My 2002 Tahoe (just purchased last weekend) has 71K on it--I got a good deal on an ISS on Amazon for just shy of $50, but it's a Dorman - Steering Shaft, Part Number: 425-176. Will this fix the problem or do you think I should go greaseless?

Thanks for the help!!
Tim
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Old 11-15-2010, 10:59 PM
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Welcome Tim! I'm sure Daddy will chime in soon.
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