Test drive a flop

[Gjeep]

I've had a build going for several months. Finally got it on the road...Test drive was a flop unfortunately... in motion the truck had a screeching/ scraping sound at load (when driving). Didn't want to take it above 25-30mph. Though the belt may have been the belt at first, but I could rev the motor when parked to 3500 rpm for 5 mins with no noises. Under load seems to be when the noise happens above 7-10mph. Any ideas? Mind you it's new everything engine, trans, transfer case, bearings on wheels front and rear, new pinion yokes front and rear -- there were no crush sleeve shims only a large washer and torqued to spec. Don't see anything dragging for the brakes front or rear, they're not over heating. Have no idea... Idea's?

 

1992 MJ short bed - Hesco Stroker, Edelbrock head, Borla header, AX15, NP231 D30/ D44, OME 934's, Metric Ton leafs, 31's

[Gjeep]

Here's a video...no idea why it's displayed sideways. Anyway, see if you can figure out the sound. Many thanks.

[Jeep Driver]

Is it really running that hot?

[Strokermjcomanche]

Can barely hear it on the video , but I'd guess something clutch/flywheel related . Maybe a backing plate / dust shield rubbing too 

[Gjeep]

I was thinking that as a possibility. All components were torqued to spec, don't see how it would rub on backing plate?  Same backplate I ran before and bellhousing too. Going to dread needing to pull the trans if that's the case.

 

[Gjeep]

Also should mention I am running the super beefy Brown Dog motor mounts with factory motor mounts AND a Rusty's 1" drop crossmember. I've never run one of these before. Any chance That's somehow causing issue with the transmission back plate?

 

I guess my first order to do in the morning is peek into/ under the backing plate and start by shimming the lower self tapping bolts with a washer or two.

 

Then swap out the crossmember with a factory one?

 

 

[HOrnbrod]

Did you press the clutch pedal in right at the end of the video? At about 22 sec?

[Gjeep]

Yes it really is running that hot, but I shut it down and let it cool often. Apparently these strokers run hot few thousand miles according to Hornbrod.

[Gjeep]

That wasn't the clutch at 22 seconds. If anything it was me shutting the truck off/ down.

 

[HOrnbrod]

17 minutes ago, Gjeep said:

Yes it really is running that hot, but I shut it down and let it cool often. Apparently these strokers run hot few thousand miles according to Hornbrod.

 

Yes, mine ran hot until ~1K miles or so, but that was only on a long uphill grade or stuck in traffic on a 90* plus day. During that break-in time my temp gauge approached the red zone as close yours is maybe five times max. For normal open road driving it ran just slightly over straight-up. To me, anything over mid-scale I worry about. Gotta ask the obligatory, are you running the 195* Mopar stat?

 

The biggest single mod that helped me run consistently cool was GoJeeps restrictor mod HERE.

 

But give it some time....

[Gjeep]

I need to call hesco. No idea what they put in it but guessing it’s 195

[DirtyComanche]

Check gauge accuracy.

 

Fan rubbing something?  Or something rubbing a driveshaft?  Can't hear enough in the video to say much...

[Manche757]

6 hours ago, Gjeep said:

Here's a video...no idea why it's displayed sideways. Anyway, see if you can figure out the sound. Many thanks.

IMG_1099.MOV

GJeep, I get a message that the vid is no longer available. Did you download and save it?

[HOrnbrod]

10 hours ago, Gjeep said:

I need to call hesco. No idea what they put in it but guessing it’s 195

 

That's what I had in mine. 

[Gjeep]

Thought it might have been the rear TeraFlex parking brake, driver's side, dragging as the lever still sticks after greasing so I disconnected that side. Need to pull it part, but wasn't the noise. Noise starts to happen around temp 150* but it could be anything drivetrain even as it heats up as it goes. Going to put the truck on jackstands later this afternoon and see if it happens when the truck is in the air. and "driving". Also, it bucks like a bronco at temp and idle is all over the place and then gets low. It's about 40* out. I could see behind the trans coverplate and there is nothing scraping on it.

[Gjeep]

Found this video on YouTube. Sound is just about identical to mine. 

 

[Jeep Driver]

If it's engine temp related, it's engine related. 

Not drive line. 

 

If it bucks and idle varies and goes low as you state, it's engine related. 

 

I don't care who or what or how proud they are of it.........I build my own engines, I want to know. 

 

Everyone is going to piss in the breeze until you figure this out. 

 

[HOrnbrod]

G, have you checked for codes recently?

[Gjeep]

Nope, check engine light isn’t on. 

[HOrnbrod]

Don't matter - check the codes using the key sequence. 99% of the embedded codes do not throw the CE light.