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As the title says my forward clutch fried itself. I can easily replace the damaged parts but I need to know what possibly caused this. Any help is appreciated. This would be my 3rd time in a transmission ever. My first 2 times being in a 46re. But was successful with only my 2nd attempt. Laymen’s terms please. TIA.
lots of places to look for
The most likely will be:
-improperly adjusted shifter
-low fluid level
-teflon sealing rings on the input shaft have worn grooves in the fwd drum bore and no longer have proper seal
-cut/ripped/torn seal on the piston itself
The fwd clutch circuit is very simple. If it is the only thing goof'd up it will be tough to blame a valve body or pump etc.
Are there any other symptoms or signs of failure in the trans? Any other clutch packs burnt up? Were any pressure tests done?
As Maroon stated a place i have found very common is grooves worn inside drum where rings ride and its easy to miss and just a tiny bit of wear is To much and will kill the forward clutch short order .
__________________ Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
lots of places to look for
The most likely will be:
-improperly adjusted shifter
-low fluid level
-teflon sealing rings on the input shaft have worn grooves in the fwd drum bore and no longer have proper seal
-cut/ripped/torn seal on the piston itself
The fwd clutch circuit is very simple. If it is the only thing goof'd up it will be tough to blame a valve body or pump etc.
Are there any other symptoms or signs of failure in the trans? Any other clutch packs burnt up? Were any pressure tests done?
No pressure test done. Trans drove and shifted fine up until it wanted to go forward in every gear. Drove just fine 30 mins back home. Remaining clutches have normal wear. After work today I’ll inspect the drum, piston, and seal rings for wear
As Maroon stated a place i have found very common is grooves worn inside drum where rings ride and its easy to miss and just a tiny bit of wear is To much and will kill the forward clutch short order .
will do today after work. If this is the case would you recommend getting it bored and going with the oversized Sonnax seals?
The oversize sealing rings are OK
You can also just get a new drum...they're common enough and not crazy expensive.
Either option is a fine fix (assuming that is your root cause issue)
The oversize sealing rings are OK
You can also just get a new drum...they're common enough and not crazy expensive.
Either option is a fine fix (assuming that is your root cause issue)
I sure hope so. I should know in a lil while. What would make it wear into the drum? A bushing?
It's a compound issue
There isn't enough bushing support, especially when they wear out
The fit from the shaft to the drum itself is snug and allows contact
Basically...it's a moving part without proper support...so over time it's liable to wear
I've wondered about doing something like the little brass bushings they make to stabilize the direct on the center support. Probably more trouble than it's worth on that small of a surface area. Probably just get chewed up.
About the best you can do is make sure the stator bushings and the overrun/overdrive bushings are mint.
Omega machine makes a wider FWD drum to overdrive carrier bushing but I havent noticed much of an increase in longevity...or rather no real feedback either way.
I have just been putting a durabond in that position and things seems reasonably stable for a number of years. Certainly more cost effective than the omega wide bushing.
Is this the first tear down of this trans or has it been apart before? If so how many miles on each build? If not the condition of the forward clutch pack would lead me to believe that the direct clutch pack can't be in great condition either. high mileage units not very well maintained lead to clogged coolers and insufficient fluid flow which fry units. i have seen plenty of burned up units that a complete overhaul and a flushing or replacement of any coolers/radiator lead to a long lasting rebuild.
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4l80e Forward Clutch Fried 
