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Transmission Swap

Discussion in 'GM Powertrain' started by Pete Japan, Jan 8, 2012.

  1. Pete Japan

    Pete Japan New Member

    Will a New Process transmission and transfer case from a 97' fit directly, and work, in a 99' Suburban, without any problems or mods?
  2. Crawdaddy

    Crawdaddy Moderator Staff Member Platinum Contributor 1000 Posts

    Is it a new process transmission? Also, what model NP transfer case is it? Common GM transmission that went in the Suburban were 4L60E for 1/2 ton trucks and 4L80E for 3/4 and 1 ton trucks. I'm not sure what transfer case was used in 99, I think it was either an NP241 or an NV transfer case for the half ton trucks.
  3. Pete Japan

    Pete Japan New Member

    It is an NP246GM 272 Ratio. the build date stamp looks to be March/April 98'
  4. MrShorty

    MrShorty Moderator Staff Member 1000 Posts

    I don't think the '97 transfer case will be direct replacement, as I believe the NV246 was first introduced for the '98 model year. If you do it, I would try to get all of the transfer case stuff (switches, control module, lever [if applicable], and so on).

    I believe, since the '99 suburban was still the old body style (OBS), the transmission should swap ok (assuming you are swapping from 1500 to 1500 or 2500 to 2500). Are the donor and recipient both half ton? or both 3/4 ton?
  5. Pete Japan

    Pete Japan New Member

    Good to hear. I will try and talk the guy into seperating the trans and the transfer. yes K1500 to K1500

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