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Is my truck losing power, transmission going, or am I going crazy?

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Old 07-23-2015, 09:39 PM
clintonvillian clintonvillian is offline
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Is my truck losing power, transmission going, or am I going crazy?

It is an 08 Supercab with the 5.4, 3.73, 58,000 miles. Truck has had NO issues until this point.


I used to be able to pull out and slip/squeel the tires (285-75-R17) if I wanted to. Now I can't, the truck just doesn't feel right.


I checked the transmission fluid (pan shows a little leakage, nothing major), it was a little low (still on the dip stick but not in the hot area). I thought that might be the problem. I added fluid, no help.


Cleaned the MAF sensor, no help......I don't think it is in the engine though, it revs fine in neutral. If I put it in D or 1st, and get on it hard from a dead stop it pulls hard to 2500rpm, then it bogs down from 2500-3500, at 3500 it takes back off pulling hard again ......Any ideas???


Oh, I did notice when I let off after revving it in neutral, I get some popping and cracking under the cab.....I didn't notice that before, maybe I overlooked it, is that normal?


Transmission fluid is good
No Codes
No engine Light
Clean MAF
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Old 07-23-2015, 09:47 PM
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Possible restricted exhaust flow. Check tubing, cat converters and mufflers for damage or internal restriction.
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Old 07-24-2015, 01:14 PM
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How long has it been since the fuel filter has been changed?
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Old 07-24-2015, 02:17 PM
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This is not a transmission problem. It's an engine problem.
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Old 07-24-2015, 03:12 PM
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go to autozone and have them do a diag on the truck, might have a bad plug or coil.
mine did the same thing... just didnt feel right and low power.
Diag said we had a bad plug or coil, so we replaced all 8. back to normal now.

thanks
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Old 07-25-2015, 08:59 PM
clintonvillian clintonvillian is offline
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OK,


Found part of it, maybe all.......


I forgot to mention I put a new fuel filter on it, that is not an issue.


We left on our way to the beach, I had to drive 100 miles in the WRONG direction for my daughters doctors appointment. So I drove the truck, 100 miles in, a grind started in the front end.


As we drove home the grind got louder, I did all your typical stuff....shifted into neutral, noise left. when coasting noise was gone. I pulled over, and crawled under it. I noticed the front axles were hot. One spun free the other wouldn't.


I drove it on home at this point and decided not to continue to the beach. I noticed when in 4wd the noise would quit. So I was sure it was there.


I took apart the front hub that was grinding (this axle spun free) the locker gear was ground down. So I pulled it out, I can drive the truck in 2wd for now.


I studied how the assembly worked, and realized that the hubs lock in and out. Something didn't set right with me. So I got on here and looked, I had been under the assumption this system worked as my 2000 model and all shafts turned to the diff. Not so. I noticed there was very little vacuum on this side, thought I had a hose issue.


So I got to thinking the other shaft should spin free which it wasn't. So I tore it down
and there was THE problem. There was a hole in the diaphragm, which had let water in and rusted out the housing. This side was locked in 4wd, and had been for some time.


I pulled the locker out of it for now as well. This relieved a vibration issue I had, and MPG's went from 12 up to 15on the highway. I am still not back to 17 where I once was. It is definitely a start though. The truck is still lugging in that 2500-3500 range.
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Old 07-25-2015, 08:59 PM
 
 
 
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