Jeep 4.0 Crate Engine Jasper. Jeep 4.0 crate engine (stroker&crate engine jasper. We have a large selection of jeep 4.0l crate engines and if you're looking to get even more power out of your newer wrangler, aev offers complete jeep v8 hemi conversion kits for 07+ wranglers.
After driving approximately two weeks and 600 miles, the new engine developed a major oil leak, serious enough.
Apparently it's a common issue with the 4.0 of this vintage.this was a strange one, a little. Jasper stock replacement crate engines (for most applications) are available from a nationwide inventory located in its distribution network across the is any engine or transmission builder in your community willing to send you on your way with a warranty like this? It's a streetable upgrade for a tired 4.0l. I will not recommend jasper engines in future.