Strange c4 problem
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Strange c4 problem
First, let me say that I've searched EXTENSIVELY on here and have seen nothing like this problem. I used the search function on 2 computers to circumvent the "admin will not allow searches be performed in less than 30 seconds" rule.
I also spoke to a friend who's a transmission guy on the side as well as a professional (who is a friend of a friend), who offered his knowledge and is stumped as well.
Here's the scoop: 78 f150 LWB, 302 - C4 (ignore my screename). Stock built engine and tranny (perhaps original w/o rebuild), 136k, stock tranny cooler. Recently replaced tailshaft bushing and seal and slipyoke.
The problem is this: I just got it ready for its first inspection in 6 years (been sitting all this time). Previously, I drove it without incident for aobut 5 miles. Monday, I took it out for a drive to the inspection, stopped prior to the destination(about 1.5 miles), checked the fluids once again and added 1 quart of ATF (type F, of course). When I first filled it, te truck was not on level ground or warm yet, so now it was.
After triple checking the level at warm and idling, the dipstick read proper. I drive to inspection station. 30 seconds after shutting the engine down, the tranny starts gurgling and then dumps 2-4 quarts out the tailshaft vent. Needless to say, the inspector would not inspect it.
I drive away with only one instance of mis-behavior, it "shunked" into 2nd gear, but after that, no problems for the next 4 miles home. For giggles, I add about 2 qts while idling in the alley only to watch it gurgle afain and dump it promptly (this time engine running). Tranny now slips so bad that it will not climb my driveway.
Some friends and I push it back on the drive and I then let it sit for a day. At this point, I call Daniel, my shadetree tranny guy who suggests that the cooler or cooling lines may be blocked.
Today, I add a quart and (ice cold and untouched since pushing) it immediately dumps it. I call tranny shop friend who suggests the same as Daniel, as well as checking the length of the dipstick to the tube (seems OK). check for obstructed venting at the cap on the tailshaft. all ok. Per Daniel's and John's suggestion, I disconnect the return line from the cooler and check for flow. To spec: about 1 quart in 20 seconds. We blew out the return line back to tranny and heard it bubble in the pan.
I start the truck and it takes 2qts without incident, but reads 1.5-2qts low on the dipstick. I run thru the gears without trouble, I drive it for about 2 miles (95* today) and no issues.
Any ideas? The only things I can come up with is that A)the filter may be blocked and not flowing the fluid to the internals, leaving an unnatural balance. B) my tranny is just screwed.
any help is greatly appreciated. Thank you.
I also spoke to a friend who's a transmission guy on the side as well as a professional (who is a friend of a friend), who offered his knowledge and is stumped as well.
Here's the scoop: 78 f150 LWB, 302 - C4 (ignore my screename). Stock built engine and tranny (perhaps original w/o rebuild), 136k, stock tranny cooler. Recently replaced tailshaft bushing and seal and slipyoke.
The problem is this: I just got it ready for its first inspection in 6 years (been sitting all this time). Previously, I drove it without incident for aobut 5 miles. Monday, I took it out for a drive to the inspection, stopped prior to the destination(about 1.5 miles), checked the fluids once again and added 1 quart of ATF (type F, of course). When I first filled it, te truck was not on level ground or warm yet, so now it was.
After triple checking the level at warm and idling, the dipstick read proper. I drive to inspection station. 30 seconds after shutting the engine down, the tranny starts gurgling and then dumps 2-4 quarts out the tailshaft vent. Needless to say, the inspector would not inspect it.
I drive away with only one instance of mis-behavior, it "shunked" into 2nd gear, but after that, no problems for the next 4 miles home. For giggles, I add about 2 qts while idling in the alley only to watch it gurgle afain and dump it promptly (this time engine running). Tranny now slips so bad that it will not climb my driveway.
Some friends and I push it back on the drive and I then let it sit for a day. At this point, I call Daniel, my shadetree tranny guy who suggests that the cooler or cooling lines may be blocked.
Today, I add a quart and (ice cold and untouched since pushing) it immediately dumps it. I call tranny shop friend who suggests the same as Daniel, as well as checking the length of the dipstick to the tube (seems OK). check for obstructed venting at the cap on the tailshaft. all ok. Per Daniel's and John's suggestion, I disconnect the return line from the cooler and check for flow. To spec: about 1 quart in 20 seconds. We blew out the return line back to tranny and heard it bubble in the pan.
I start the truck and it takes 2qts without incident, but reads 1.5-2qts low on the dipstick. I run thru the gears without trouble, I drive it for about 2 miles (95* today) and no issues.
Any ideas? The only things I can come up with is that A)the filter may be blocked and not flowing the fluid to the internals, leaving an unnatural balance. B) my tranny is just screwed.
any help is greatly appreciated. Thank you.
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Is that at the front? if yes, then no It is not. Its coming out of the vent cap on the top of the tailshaft.
PS: I installed a brand new spicer slip yoke that was just a bit shorter by an inch than te galled one it replaced. could this be suspect?
PS: I installed a brand new spicer slip yoke that was just a bit shorter by an inch than te galled one it replaced. could this be suspect?
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UPDATE!!!!
problem fixed. I spoke more at length with Daniel, my knowledgable neighbor, and he suggested something kinda esoteric.
Has anyone seen Ferris Bueller's day off? Remember the scene about reversing the odometer? Well....
Daniel was of the belief that there was something foreign in the valvebody or cooling lines that was not allowing proper fluid flow. This truck had been sitting for aobut 5 years before I bought it.
His suggestion (because I am unwilling to do a tear-down at this time) was to jack the truck's drive wheels up, put it into reverse, and run it for about 10-20 minutes (until the trany was at proper temp) to send the particulates back into the pan to be filtered by the screen and filters.
Well, in short, it worked. Now all I have to do is to drain and re-filter it, and it should be good to go. So, hopefully, this may find useful to others with similar issues.
Mark, Thanks for the advice. FYI: there's no o-ring on FMX/C4/T5 slip yokes.
problem fixed. I spoke more at length with Daniel, my knowledgable neighbor, and he suggested something kinda esoteric.
Has anyone seen Ferris Bueller's day off? Remember the scene about reversing the odometer? Well....
Daniel was of the belief that there was something foreign in the valvebody or cooling lines that was not allowing proper fluid flow. This truck had been sitting for aobut 5 years before I bought it.
His suggestion (because I am unwilling to do a tear-down at this time) was to jack the truck's drive wheels up, put it into reverse, and run it for about 10-20 minutes (until the trany was at proper temp) to send the particulates back into the pan to be filtered by the screen and filters.
Well, in short, it worked. Now all I have to do is to drain and re-filter it, and it should be good to go. So, hopefully, this may find useful to others with similar issues.
Mark, Thanks for the advice. FYI: there's no o-ring on FMX/C4/T5 slip yokes.
