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Old 02-19-2011, 06:14 PM   #1
paintballdude902
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how to diagnose bad trans vs transfercase

alright guys

the bronco was acting up and making some bad noises when i began cruising. so i flushed the transfer case hoping that was the problems.

today i went for a test drive it acted fine for about 3 miles then on my way home the transmission began spinning. by spinning i mean i was giving it gas but noting happened, RPMs went up and speed was going down. i ended up coasting home and pushing it around the block to park it.


i had my transfer case break off last year (PO had over torqed the bolts when he had the trans rebuilt and cracked the bolts) and it gave me the exact same symptoms that it is today. i checked the trans fluid and it was a little light colored (redish pink vs just red) but not burned.

im gonna drop the pan on the AOD tomorrow and check for any ball bearings or anything. the last fluid change was about 20k ago.


whats the best way to tell if its the trans vs the transfer case.


i really only need it to run for 60 days till i ship out for basic
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Old 02-19-2011, 07:46 PM   #2
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Try shifting into 4-low, and 4-hi.

Drop the pan, super easy thing to do and see if there's any shavings/chunks.

EDIT: My vote is on trans though.
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Old 02-19-2011, 08:04 PM   #3
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if it was the transfer case it would have either jumped into neutral or something would have snapped/made noise/grinded.

Probably the trans. The AOD is kind of known for kicking the bucket. The TV cable didn't break did it? (cable that goes from the throttle down to the trans)
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Old 02-19-2011, 11:32 PM   #4
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i had a grinding noise about 5 mins prior to losing power.
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Old 02-19-2011, 11:47 PM   #5
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Is the transmission parking position holding the the truck? If yes- the t-case isn't the problem.

Does this "free-wheeling" happen in every gear position including reverse? If yes- you may have a broken flex plate or a screwed up torque converter. If the starter still turns over the engine, you can rule out the flex plate. I've had a broken flex plate and a broken torque converter on separate occasions.
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Old 02-20-2011, 12:36 AM   #6
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This is exactly what happened to my E4OD, drop it now before it gets worse.
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Old 02-20-2011, 02:24 AM   #7
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Is the transmission parking position holding the the truck? If yes- the t-case isn't the problem.

Does this "free-wheeling" happen in every gear position including reverse? If yes- you may have a broken flex plate or a screwed up torque converter. If the starter still turns over the engine, you can rule out the flex plate. I've had a broken flex plate and a broken torque converter on separate occasions.
park makes it stay still. explain to me how that rules it out, if you would be so kind. havent tried it in reverse... didnt feel like pushing it any more LOL.
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I told my wife she would be more likely to leave before my bko.
USAF ballistically integrated tactical cargo handler

Quote:
Originally Posted by c-dub View Post
If I had to pick a lord and savior it would be John Moses Browning .
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Old 02-20-2011, 11:04 AM   #8
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park makes it stay still. explain to me how that rules it out, if you would be so kind. havent tried it in reverse... didnt feel like pushing it any more LOL.
The parking pawl is in the transmission. If the t-case was freewheeling (like putting it in neutral)- there wouldn't be anything preventing the truck from rolling.
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