Does the 5.4L use the same main bearings as the 4.6L or are they heavier duty?

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99 F150 XLT Supercab Towing Package 5.4L Auto Two Tone Med Toreador Red/ Silver Power windows, locks, mirrors, driver's seat. Cruise, tilt wheel Alloys, Michelins, ARE topper Superchip / 2000 Chevy Silverado Ext cab 5.3, auto, Tow package, tilt, cruise, power windows,locks,side mirrors, alloy wheels.

 

HI!... PSYCHO : The 5.4 and the 4.6 both have a 2.6572 main journal diameter. So the answer is yes, they both use the same main bearings. That is what a modular engine means. All the triton engines 5.4 - 4.6- 6.8 use a lot of the same parts. That does not mean that the 5.4 main bearings are weak. Just think that the V-10 uses the same bearing size also.

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NEAL [ the horsepower freak ] NEWMAN
'99' F-150 XLT SPORT, oxford white, reg cab shortbox stepside,5.4, auto, 4.10L.S, captain's chairs, bedliner, GTS carbon fiber headlight covers, **** CEPECK clear halogen driving lights, GTS slotted tailight covers (painted oxford white), FORD locking lug nuts, tinted windows,true duel exhaust with 2.5 inch mandrel bent pipes and FLOWMASTER 3 chamber mufflers with 3' tailpipes exiting before the rear wheel like the LIGHTNING, HELLWIG rear stabalizer bar, AUTOMETER guage pod and tranny temp guage, custom fabricated air intake trac and huge K/N filter, TPS mod, BELLTECH 2-inch rear drop, custom programed SUPERCHIP.

FUTURE MODS : JBA headers, power pulleys, twin electric fans, traction bars, BAUMANN ENGINEERING shift kit, and a KENNE BELL BLOWZILLA supercharger.
ESTIMATED H.P TO DATE : 310H.P / 405ft/lbs of torque.---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OTHER TOYS : "83" PRO STREET FORD RANGER : 351-w 530H.P(natural), 750H.P with N.O.S, tubbed (crome moly tubing), 12 point chrome moly roll cage, 4-link with coil overs, MUSTANG II front suspension, c-4 tranny (race prepped), 4000rpm stall converter(8 INCH), 3" chrome moly driveshaft,AUTOMETER guages, 15.50 MICKEY THOMPSON rear tires, 4" M/T front tires, fiberglass hood - bumper - prostock hood scoop, wishbone trac-link, two chrome moly driveshaft loops, 16 gallon RCI fuel cell,etc

 

HI!... PSYCHO : The 5.4 and the 4.6 both have a 2.6572 main journal diameter. So the answer is yes, they both use the same main bearings. That is what a modular engine means. All the triton engines 5.4 - 4.6- 6.8 use a lot of the same parts. That does not mean that the 5.4 main bearings are weak. Just think that the V-10 uses the same bearing size also.

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NEAL [ the horsepower freak ] NEWMAN
'99' F-150 XLT SPORT, oxford white, reg cab shortbox stepside,5.4, auto, 4.10L.S, captain's chairs, bedliner, GTS carbon fiber headlight covers, **** CEPECK clear halogen driving lights, GTS slotted tailight covers (painted oxford white), FORD locking lug nuts, tinted windows,true duel exhaust with 2.5 inch mandrel bent pipes and FLOWMASTER 3 chamber mufflers with 3' tailpipes exiting before the rear wheel like the LIGHTNING, HELLWIG rear stabalizer bar, AUTOMETER guage pod and tranny temp guage, custom fabricated air intake trac and huge K/N filter, TPS mod, BELLTECH 2-inch rear drop, custom programed SUPERCHIP.

FUTURE MODS : JBA headers, power pulleys, twin electric fans, traction bars, BAUMANN ENGINEERING shift kit, and a KENNE BELL BLOWZILLA supercharger.
ESTIMATED H.P TO DATE : 310H.P / 405ft/lbs of torque.---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OTHER TOYS : "83" PRO STREET FORD RANGER : 351-w 530H.P(natural), 750H.P with N.O.S, tubbed (crome moly tubing), 12 point chrome moly roll cage, 4-link with coil overs, MUSTANG II front suspension, c-4 tranny (race prepped), 4000rpm stall converter(8 INCH), 3" chrome moly driveshaft,AUTOMETER guages, 15.50 MICKEY THOMPSON rear tires, 4" M/T front tires, fiberglass hood - bumper - prostock hood scoop, wishbone trac-link, two chrome moly driveshaft loops, 16 gallon RCI fuel cell,etc

 

Hi Neal, the reason why i asked is on the Chevy site they were downing the 5.4 as light on bearings for heavy hauling. They said the bearings in the 5.3 are way better.

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99 F150 XLT Supercab Towing Package 5.4L Auto Two Tone Med Toreador Red/ Silver Power windows, locks, mirrors, driver's seat. Cruise, tilt wheel Alloys, Michelins, ARE topper Superchip / 2000 Chevy Silverado Ext cab 5.3, auto, Tow package, tilt, cruise, power windows,locks,side mirrors, alloy wheels.

 

What Chevy site are you on? From what I have been reading on pickup.com and edmunds.com the 4.8 5.3 and 6.0 are having serious problems with bearings. Check out the thread "Going back to Foreign" and read what I posted there.