ICEBOX Posted December 4, 2008 Share Posted December 4, 2008 I HAVE A 1990 4.0 i CAN BUY A 1998. IS THAT A DIRECT SWAP .MEANING WILL ALL MY STUFF WORK ON THE NEW BLOCK AND HEAD ?? Link to comment Share on other sites More sharing options...
Eagle Posted December 4, 2008 Share Posted December 4, 2008 All your stuff? No. Many of the brackets for alternator, power steering pump, etc, are totally different between the 1990 Renix models and the 1998 Chrysler models. The ports on the head are different, so you can't (easily) swap your manifolds onto the "new" engine. The throttle body is different. The injectors are different. The flywheel is different and won't work with your CPS, but if you try to use the 1998 CPS ... it won't work with your Renix computer. Even the oil filter is different. Link to comment Share on other sites More sharing options...
ICEBOX Posted December 4, 2008 Author Share Posted December 4, 2008 SO I COULD NOT TAKE THE 98 TO A BARE BLOCK AND US MY STUFF? BETTER BET TO STAY WITH A NO HO . Link to comment Share on other sites More sharing options...
wolfpackjeeper Posted December 4, 2008 Share Posted December 4, 2008 it would be better to not type with caps lock on. If you got a newer donor vehicle you could just swap everything, wiring harness and accessories included. Link to comment Share on other sites More sharing options...
BREEZE1 Posted December 4, 2008 Share Posted December 4, 2008 viewtopic.php?f=9&t=7659 :banana: Link to comment Share on other sites More sharing options...
carnuck Posted December 5, 2008 Share Posted December 5, 2008 If you use the larger injectors from the HO on your Renix motor, you WILL get more power (it's also a large portion of the HO's extra power) but you'll pass fewer gas stations! Link to comment Share on other sites More sharing options...
FxRacing282 Posted December 5, 2008 Share Posted December 5, 2008 it would be better to not type with caps lock on. :rotf: Link to comment Share on other sites More sharing options...
Eagle Posted December 5, 2008 Share Posted December 5, 2008 SO I COULD NOT TAKE THE 98 TO A BARE BLOCK AND US MY STUFF?BETTER BET TO STAY WITH A NO HO . Yes, you could take it to the bare block. That means "block," not "block + head." To use your manifolds, you will need to use your head (or another non-HO head). To use the '98 HO manifolds, you'll need to adapt a bunch of brackets for things like the alternator and power steering pump. And you'll have to adapt your throttle body to the newer intake manifold. You will also have to tap a hole to mount the knock sensor in the block, because the HO engine doesn't use one. Dimensionally, the '98' block is the same as the '90 and will fit the chassis with no problems. But, as the saying goes, "The devil is in the details." You will find that you'll be doing a lot of adapting. It is not going to be a drop-in replacement. It all comes down to how cheap you can buy the '98 engine, how creative you are about adapting ... and how much time you can tolerate the truck not running while you figure out the conversion. Link to comment Share on other sites More sharing options...
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