M998 engine and transmission swap

gtown_hummer

New member
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Georgetown, TX
Hi Gentlemen,

I am new here on the site and am looking for some advice regarding my recent purchase of a 1987 M998. First thing I would like to do is to make it go faster, not as noisy and able to tow. It currently has the original 6.2 engine with 3-spd. What did you do to your M998 to get it to go faster and a little quieter? If you are here in central TX, did you have someone local do the work for you?

TIA,
James
 

papakb

Well-known member
Steel Soldiers Supporter
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Location
San Jose, Ca
If you go to the HMMWV forum here on Steel Soldiers there are quite a few postings about swapping out the 6.2s for either another 6.2 or the full 6.5/4L80E swap. The 6.5/4L80 swap will give you lower noise levels on the road but is quite a bit more involved. Drive shafts need to be lengtheded and shortened and a new transmission mount needs to be installed along with a front wiring harness to communicate with the 4L80 transmission.

Take a look here: https://forums.g503.com/viewtopic.php?f=63&t=221765
 
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