low power question
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Senior User
Joined: Dec 2004
Posts: 117
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From: Wichita, KS
low power question
Could a wore out slipping auto tranny cause MPG to decrease and loose power to the rear wheels?
Reason I ask is my MPG has gone down significantly since I bought my truck 1 1/2 yrs ago. My SES light isn't on, but the truck just doesn't seem to have the power it should/did. My buddy has a 2000 F350 CC dually with a brand new Jasper tranny and his truck feels like it has alot more power than mine and is half as quiet too. The first thing he noticed when riding in my truck is how much louder it was than his, and he hasn't done any mods to his except the 6637 filter.
My truck (compared to his) when stepping on the gas makes abunch of noise and little whine, so I pulled all 4 IC boots, cleaned them and reinstalled with no difference and I'm sure I dont have a leak there.
I'm thinking either the tranny isn't transfering the power or something mechanically engine wise, is robbing power. The blades on the turbo look ok too.
Any ideas where to start looking or could a diesel mech shop be able to hook up, run test and see if everything is normal?
Reason I ask is my MPG has gone down significantly since I bought my truck 1 1/2 yrs ago. My SES light isn't on, but the truck just doesn't seem to have the power it should/did. My buddy has a 2000 F350 CC dually with a brand new Jasper tranny and his truck feels like it has alot more power than mine and is half as quiet too. The first thing he noticed when riding in my truck is how much louder it was than his, and he hasn't done any mods to his except the 6637 filter.
My truck (compared to his) when stepping on the gas makes abunch of noise and little whine, so I pulled all 4 IC boots, cleaned them and reinstalled with no difference and I'm sure I dont have a leak there.
I'm thinking either the tranny isn't transfering the power or something mechanically engine wise, is robbing power. The blades on the turbo look ok too.
Any ideas where to start looking or could a diesel mech shop be able to hook up, run test and see if everything is normal?
Postmaster
Joined: Nov 2003
Posts: 3,595
Likes: 0
From: Utah County, UT
Think you are on the right track, but how many miles on current tranny? you said your engine sounds louder? what type of louder? I'd hate to see ya go and spend some major $$ if it isn't the tranny, albeit the tranny will need it sooner or later, just a matter of time there. You when you give it a little go pedal, do the RPMs rise as normal and the truck just doesn't seem to move, or does it take a lot of pedal to get the increase in RPMs?
Thread Starter
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Senior User
Joined: Dec 2004
Posts: 117
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From: Wichita, KS
the truck has 117k on it, 97k when I bought it Jan 2005.It seems as it takes a bit of throttle to get the motor reved up to 2000-2500 but when there it just makes alot of noise. I can hear the turbo singing but it just doesn't feel like it has the power it should.
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
yes the feeling of having the power and hearing the power, but not getting it to the ground is a slipping torque converter. it slips like a retarded three-legged dog on ice anyway, and wear only accelerates it. you could go the easy way, add a torque converter override lockup switch ($50) and have the control to lock the T/C in place which would eliminate almost all the slip in the converter. or do what your buddy did, and get a new or rebuild the transmission. if you want to go all out and get the last transmission you will ever need (seriously) i would contact Brian at BTS... www.brianstruckshop.com , and many people can vouch for that! 
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by SprintRacer26
Could a wore out slipping auto tranny cause MPG to decrease and loose power to the rear wheels?
Reason I ask is my MPG has gone down significantly since I bought my truck 1 1/2 yrs ago. My SES light isn't on, but the truck just doesn't seem to have the power it should/did. My buddy has a 2000 F350 CC dually with a brand new Jasper tranny and his truck feels like it has alot more power than mine and is half as quiet too. The first thing he noticed when riding in my truck is how much louder it was than his, and he hasn't done any mods to his except the 6637 filter.
My truck (compared to his) when stepping on the gas makes abunch of noise and little whine, so I pulled all 4 IC boots, cleaned them and reinstalled with no difference and I'm sure I dont have a leak there.
I'm thinking either the tranny isn't transfering the power or something mechanically engine wise, is robbing power. The blades on the turbo look ok too.
Any ideas where to start looking or could a diesel mech shop be able to hook up, run test and see if everything is normal?
Reason I ask is my MPG has gone down significantly since I bought my truck 1 1/2 yrs ago. My SES light isn't on, but the truck just doesn't seem to have the power it should/did. My buddy has a 2000 F350 CC dually with a brand new Jasper tranny and his truck feels like it has alot more power than mine and is half as quiet too. The first thing he noticed when riding in my truck is how much louder it was than his, and he hasn't done any mods to his except the 6637 filter.
My truck (compared to his) when stepping on the gas makes abunch of noise and little whine, so I pulled all 4 IC boots, cleaned them and reinstalled with no difference and I'm sure I dont have a leak there.
I'm thinking either the tranny isn't transfering the power or something mechanically engine wise, is robbing power. The blades on the turbo look ok too.
Any ideas where to start looking or could a diesel mech shop be able to hook up, run test and see if everything is normal?
Thread Starter
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Senior User
Joined: Dec 2004
Posts: 117
Likes: 0
From: Wichita, KS
Originally Posted by Kwikkordead
Have you given any consideration to the Hutch mod and elimination of all the quick connects between the fuel tank and pump?
Yes, that is on the to-do list. I can definitaly tell when i'm below 1/4 tank, do you think that even with full tank I'm sucking enough air to loose power?
With the talk of fuel pumps, it got me to thinking, at WOT my truck doesn't blow black smoke like I would think it should, could this be from a weak pump? How can I go about testing the pump to determine if it's good or bad?
Last edited by SprintRacer26; Jun 13, 2006 at 05:40 AM.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by SprintRacer26
Yes, that is on the to-do list. I can definitaly tell when i'm below 1/4 tank, do you think that even with full tank I'm sucking enough air to loose power?
With the talk of fuel pumps, it got me to thinking, at WOT my truck doesn't blow black smoke like I would think it should, could this be from a weak pump? How can I go about testing the pump to determine if it's good or bad?
With the talk of fuel pumps, it got me to thinking, at WOT my truck doesn't blow black smoke like I would think it should, could this be from a weak pump? How can I go about testing the pump to determine if it's good or bad?
IMO you cannot establish whether the fuel pump is bad or not while it's trying to pump foam. I very highly recommend that you, at the very least, get rid of the quick connects and take it from there.
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Senior User
Joined: Mar 2006
Posts: 204
Likes: 0
From: Michigan
How many quick connects are there to replace? What do you replace them with?I am going to try the hutch mod when I get back to the states.
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