Sick Sounding V-10
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Fleet Mechanic
Joined: Nov 2001
Posts: 1,553
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From: Corpus Christi, TX
Sick Sounding V-10
Oh no! First she's got cancer (rust), now she's coming down with something nasty! What to do!?! 
Here are the symptoms:
'Puffing & chuffing' at 1800 - 3000 RPM, but only when transmission is engaged, she won't do it revving in neutral. I even tried revving her up with the e-brake engaged and my foot stomping on the brakes, she still doesn't do it. (This isin't the inspection plate flutter either, I took care of that bugger long ago.)
It sounds almost like I've an exhaust leak, but from being under the truck, the sound is not coming from the manifolds or my modded y-pipe. I checked all the welds on my exhaust work with a spot mirror to make sure of this.
The sound is coming from the rear of the engine, almost at the bellhousing. Could this be a transmission problem and not an engine problem? I'm not sure but aren't the signs she's displaying could also go for a bad torque converter?
I'm starting to look like this guy with all the stuff I'm finding wrong with my baby!!
Here are the symptoms:
'Puffing & chuffing' at 1800 - 3000 RPM, but only when transmission is engaged, she won't do it revving in neutral. I even tried revving her up with the e-brake engaged and my foot stomping on the brakes, she still doesn't do it. (This isin't the inspection plate flutter either, I took care of that bugger long ago.)
It sounds almost like I've an exhaust leak, but from being under the truck, the sound is not coming from the manifolds or my modded y-pipe. I checked all the welds on my exhaust work with a spot mirror to make sure of this.
The sound is coming from the rear of the engine, almost at the bellhousing. Could this be a transmission problem and not an engine problem? I'm not sure but aren't the signs she's displaying could also go for a bad torque converter?
I'm starting to look like this guy with all the stuff I'm finding wrong with my baby!!
Logistics Pro
Joined: Jan 2002
Posts: 3,733
Likes: 38
Munkey...
Entirely possible to be the 4R100 is sick... because of where you are it is very unlikely that you do any snow plowing (constant drive to reverse shifts seem to kill the 4R100 fairly fast)
A Ford 4R100 factory original has quite a few internals that are plastic, aluminum or too light weight for heavy duty use and they crap out unless the trans is babied .... a normal re-build these days will replace all the inferior crap with better then factory replacement parts
Normally the lock up torque converter is a good unit and most will last 80% of the life of the truck but occasionally they too get sloppy with the pump being the first to go and the lock up clutch surfaces getting burnt and warped as a problem also
If you can definitely rule out motor problems.... dirty MAF, failing IAC, poor fuel quality, then you might be in for a decent professional trans refurb...I always recommend the work of Brian at BTS dot com he is a 4R100 expert and can build a 4R100 that a 800HP 1200 Ftlb PSD can not break... and he is only slightly higher cost then local when you factor core shipment to him and do the install your self.
Entirely possible to be the 4R100 is sick... because of where you are it is very unlikely that you do any snow plowing (constant drive to reverse shifts seem to kill the 4R100 fairly fast)
A Ford 4R100 factory original has quite a few internals that are plastic, aluminum or too light weight for heavy duty use and they crap out unless the trans is babied .... a normal re-build these days will replace all the inferior crap with better then factory replacement parts
Normally the lock up torque converter is a good unit and most will last 80% of the life of the truck but occasionally they too get sloppy with the pump being the first to go and the lock up clutch surfaces getting burnt and warped as a problem also
If you can definitely rule out motor problems.... dirty MAF, failing IAC, poor fuel quality, then you might be in for a decent professional trans refurb...I always recommend the work of Brian at BTS dot com he is a 4R100 expert and can build a 4R100 that a 800HP 1200 Ftlb PSD can not break... and he is only slightly higher cost then local when you factor core shipment to him and do the install your self.
New User
Joined: Apr 2006
Posts: 16
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Before you condemn the trany do a simple test with a vacumn gage. Hook up a gage to the intake and read the vacumn. Should be in the 18-21 range. Now put the truck in gear and torque load it and see if the gage remains fairly high. Or get a long vacumn hose and put the gage where you can see it and drive the truck and put it under a load. If manifold vacumn is O or low, you could have a plugged catalytic converter, or a colapsed exhaust pipe causinig a major restriction so the motor cannot breath. Hope this helps. If the sound you refer to is a hissing sound, I bet this is your problem.
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