LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Can I put a 99 GS400 engine into 97 LS400?

Old 08-20-14, 10:05 AM
Driver School Candidate
Thread Starter
Join Date: Oct 2009
Location: CA
Posts: 6
Likes: 0
Received 1 Like on 1 Post
Default Can I put a 99 GS400 engine into 97 LS400?

Last night I discovered my "rod knock" was very bad main bearings. No rebuild here as the journals are in bad shape on mains 2 & 3.

Looking for salvage motors in my area I found a 1999 GS400 with 94K miles, everything still in the car. I'm wondering if I can take the engine/tranny/harness/ECU out of that car and drop it into my 97 LS400.

Any insights are welcome.
wfeagley is offline  
Old 08-20-14, 12:38 PM
Lexus Fanatic
iTrader: (1)
sha4000's Avatar
Join Date: Aug 2005
Location: N.Y.
Posts: 5,973
Received 123 Likes on 109 Posts

Maybe but that engine is VVT-I while yours is not.
sha4000 is offline  
Old 08-20-14, 02:01 PM
iTrader: (10)
PureDrifter's Avatar
Join Date: Aug 2004
Location: California
Posts: 23,904
Received 42 Likes on 38 Posts

is it possible? Yes.

Will not be cheap and will require substantial wiring. Also, will need to be done in a very specific way with ALL the parts from the '98 in order to be CARB legal (aka SMOG legal) in california. Just off the tip of my head you're looking at: motor, harness, all accessories, trans, flex plate, converter, custom driveshaft, swapping the rear end gears (yours will be too low), dash cluster harness, immobilizer keys, harness, sensor, and immobilizer ecu, EVAP equipment, air intake tubing and maf, and the main ECU.

Versus buying a $5-600 '95-97 long block from a yard (with warranty) and swapping it out.

Last edited by PureDrifter; 08-20-14 at 06:41 PM. Reason: *tip
PureDrifter is offline  
Old 08-20-14, 03:07 PM
Lexus Champion
iTrader: (6)
timmy0tool's Avatar
Join Date: Sep 2008
Location: 909/626/714, SoCal
Posts: 4,832
Received 116 Likes on 108 Posts

agreed on both counts, it will be much easier to get a used long block of the same year so installation will be a breeze. even if you get that motor for free, you'll spend a good amount getting it to work VVTi and all in the 97. gl!
timmy0tool is offline  

Thread Tools
Search this Thread
Quick Reply: Can I put a 99 GS400 engine into 97 LS400?

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: