IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

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Thread: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

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    IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension
    Rear suspension setup was an expensive ask, says Tim Herrick
    Alisa Priddle
    Dec 12, 2019
    motortrend.com

    Not everyone would put their job on the line for an independent rear suspension.

    Tim Herrick is not everyone. The career engineer at General Motors spent the last four or five years working on the massive truck program known as T1 that underpins GM's light-duty pickups, heavy-duty trucks, and full-size SUVs.

    The plan was always to distinguish the big SUVs, Tahoe and Suburban, from the pickups. On Herrick's wish list from the start was an independent rear suspension for the SUVs. Ford has had an independent rear suspension on the Expedition and Expedition Max for years. Herrick knew the benefits, and he wanted it for GM's large SUVs even though the pickups continued to use a leaf-sprung solid rear axle.

    "We took a number of runs at it," said the man whose work on trucks dates back to the Chevy Avalanche that went into production in 2001. It was an expensive request. Not only are the components heavier and more expensive, but it also would require tearing up the assembly process and building a new body shop at the plant in Arlington, Texas.

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    GMI Staff Member Premium Member nadepalma's Avatar
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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by motortrend.com
    Getting approval, after many requests and rejections, was a big deal. "I can tell you the date and the time," said Herrick. "It was a few years back on June 16, at 10:30. I went to a certain meeting and got approval to do it. It wasn't the first time we asked. We had to really push to the point where I might have staked my career on it."
    If this is true, then a big kudos to him for pushing to get IRS on the newest SUVs.

    More importantly, this little anecdotal nugget might ultimately give us a little bit of insight of how things work (...and don't work) within GM. If this wasn't the first time this was asked for, then it could underscores how many "car guys" (or just down-right competitive- and improvement-minded individuals) at GM are somewhat "suppressed" by the system in place. And if this man was willing to possibly harm his career to get IRS on the newest product (which itself is an incredible statement in light of the incredible volume and fat the profit margins these products produce), then he deserves a medal!

    Let's be honest, knowing the direction the market has been trending, this should have been done years ago (and at the very least on the Escalade)!
    Last edited by nadepalma; 12-13-2019 at 11:13 AM.
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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Exec's "What's it going to Cost?"

    Tim "Another Bankruptcy if We don't"

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    That adding a IRS to GM's most profitable platform was considered a tough ask, I'd find the people who were inclined to say "no" and fire them for being so out of touch with the car market.

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Yet, Ford did it decades ago.

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    I believe GM's first RWD US sedan with IRS was the 2003 CTS. That wasn't that long ago, but it was 20 years too late for Cadillac's reputation.

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by 1999 White C5 Coupe View Post
    Yet, Ford did it decades ago.
    GM was running the "if it ain't broke, don't fix it" line with these. Given the profits the large SUVs pull, I can see both sides of the IRS argument having valid points. You really don't want to mess with a cash cow when it is just sitting there making money as-is.
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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by Z Fury View Post
    GM was running the "if it ain't broke, don't fix it" line with these. Given the profits the large SUVs pull, I can see both sides of the IRS argument having valid points. You really don't want to mess with a cash cow when it is just sitting there making money as-is.
    Clearly that mantra did not impact sales given they absolutely own the segment.
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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by ral1960 View Post
    I believe GM's first RWD US sedan with IRS was the 2003 CTS. That wasn't that long ago, but it was 20 years too late for Cadillac's reputation.
    Corvair? Unsafe at Any Speed.

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by usa1 View Post
    That adding a IRS to GM's most profitable platform was considered a tough ask, I'd find the people who were inclined to say "no" and fire them for being so out of touch with the car market.
    Yeah, I like how they spin this tale as if they are hero's for doing what everyone else other than North Korean donkey-cart makers have done ages ago!

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by InCogKneeToe View Post
    Corvair? Unsafe at Any Speed.
    Wasn't a sedan?
    Who the hell approved this abomination? Hidden Content

    I bet it was some dumbarse in Detroit Hidden Content

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by CadillacSA View Post
    Yeah, I like how they spin this tale as if they are hero's for doing what everyone else other than North Korean donkey-cart makers have done ages ago!
    You did read the part about how Ford half-assed their IRS into an existing architecture as opposed starting with a clean sheet as GM did?

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Quote Originally Posted by criticalmass View Post
    You did read the part about how Ford half-assed their IRS into an existing architecture as opposed starting with a clean sheet as GM did?
    Why didnt they use a clean sheet about 4 generations earlier?
    Who the hell approved this abomination? Hidden Content

    I bet it was some dumbarse in Detroit Hidden Content

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    Front_66_Monza.jpg

    Quote Originally Posted by VS Ute 5Litre View Post
    Wasn't a sedan?
    Yes there were Sedans.

    Then the Pontiac Tempest 1961-63
    Last edited by InCogKneeToe; 12-13-2019 at 04:34 PM.

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    Re: IRS or Die: How the 2021 Chevrolet Tahoe Got its Independent Rear Suspension

    ...and the Camaro was graced with IRS well before the Mustang. You win some, you lose some.
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