Transmission slipping
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Senior User
Joined: Dec 2009
Posts: 203
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From: Boise, Idaho
Transmission slipping
Hey fellas, I have noticed a transmission slippage recently here's how it works:
in reverse, on a hill backing up the more pedal I give my truck the less power it is putting to the ground, almost like an e-brake is kicking on, more rpm's = less power? wtf?
in drive, heavy acceleration off the line it seems like the tranny isn't locking into gear, the truck moves but not like it used to, no "push you back in the seat" that it used to have. it is not as notieable in drive as it is in reverse. I could barely back out of my favorite fishing hole yesterday, Bull#!*%. I put a john wood VB in last fall and got the dp tuner right after that. I haven't been running any tunes lately just in case i have a real tranny issue, but its noticeable in stock mode too.
I searched forums and found one kinda similar, one guy suggested maybe his tranny filter was loose and letting air by? should I pull the pan and check to see if this is the case?
ps, no shuddering or anything, no squealing.
Thanks a ton guys!
in reverse, on a hill backing up the more pedal I give my truck the less power it is putting to the ground, almost like an e-brake is kicking on, more rpm's = less power? wtf?
in drive, heavy acceleration off the line it seems like the tranny isn't locking into gear, the truck moves but not like it used to, no "push you back in the seat" that it used to have. it is not as notieable in drive as it is in reverse. I could barely back out of my favorite fishing hole yesterday, Bull#!*%. I put a john wood VB in last fall and got the dp tuner right after that. I haven't been running any tunes lately just in case i have a real tranny issue, but its noticeable in stock mode too.
I searched forums and found one kinda similar, one guy suggested maybe his tranny filter was loose and letting air by? should I pull the pan and check to see if this is the case?
ps, no shuddering or anything, no squealing.
Thanks a ton guys!
Last edited by '02strokerpilot; Aug 14, 2010 at 02:23 PM. Reason: additional text
Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
Well, you could drop the pan to at least check first, but if it is shot and you feel he gears and bands are ok, you could have a shop (or yourself) put a new triple clutch TC in place of the cheap stock single clutch TC. If you need a whole new tranny, I would go with either John Woods, BTS, or in a pinch Ford sells a "heavy duty" 4r100 with a triple disc TC and strengthed internals for about $3000, and it comes with a 100k warantee to boot. You didn't say your mileage, but with regular towing and a heavy foot, these trannys usually aren't good past 150k miles (on average). Hell, I'm on my 3rd, the second one rebuilt by Midas or meineke (whoever the hell does trannys) only lasted 32k before my dumbazz blew it up LOL.....
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
Like Danny said, I would drop the pan and check the filter. It sounds like you are having low line pressure problems. A gauge connected to the line pressure test port on the left side of the trans would verify this.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
Yes. You can monitor trans slippage with an AE. You can monitor the rpm difference between the input and output shaft sensors. It is listed in your drop down menu for your live data meters. Once the TC locks, you should see zero rpm slippage in an ideal situation. I see 0 to max of 4 rpms with mine. With the TC unlocked, it is normal to see a larger rpm difference due to the design of the TC.
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
Sound like a tc for sure. These trans have weak reverse anyway. If you feel it in forward gear as well bite the bulet and put a trans in. You have a John Wood vb he usually credits you for that and will do the trans less that cost. Good luck, just don't get out on that road far or you may be sorry.
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Joined: Dec 2009
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From: Boise, Idaho
hey thanks for the help guys, my neighbor friend owns a trans shop, gonna run it by and have him test the pressure, depending on the outcome i will pull the pan and check it out. thanks again, hey, another Q for ya... can i have a shorter reverse gear put in like 2.5:1 or 3:1 area??? I have an uncanny ability to get my nose places I can only back out of. thinking about a locker in the rear too, any brand suggestions or are they all good? thanks again! oh 142,000 mile btw lots of heavy towing and lots of drag racing, pay to play i spose, lol
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From: SE Florida
No. Due to the way planetary gear sets work you would have to replace all the gears. Designing a new gear set is not an easy job. Cutting custom gears literally costs in the millions of dollars.
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Senior User
Joined: Dec 2009
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From: Boise, Idaho
figured out my problem!!! My neighbor is a trans shop owner, he did some research for me and found that installing the accumulator body (improperly known as the valve body) from John Wood and not installing the full trans shift kit, the new accumulator body does not allow proper pressure in reverse to lock the torque converter, not slippage just no aftermarket "trick" spacer to accomodate the new accumulator body. makes me happy! now i am looking into the 2-low mod. this site kicks A%%!!!
thanks for the input guys!
Alex
thanks for the input guys!
Alex
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