Just an FYI
That's way to high of RPM for this engine. It makes no extra power up there. You are just reving the out of it.
I don't think I have ever taken My currant engine past 4k rpm.
Look at You desk top dyno. power drops off before that hi of RPM.
I will run 4,000 rpm on mountain grades and only push to 4,500 rpm if itís necessary to be able to hold the next gear. I donít think I have ever been to 5,000 rpm, but have been told there is a rev limiter up there somewhere.
1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires. Marlin rear bumper & sliders. FROR front bumper. SAS with Alcan springs & Rancho 9000XL shocks. Budbuilt Bolt-on traction bar. Custom Interior Cage by Those Guys Rod and Customs.
Moab Tested & Rubicon Approved