Troubleshooting help needed...
Thread Starter
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New User
Joined: Apr 2003
Posts: 2
Likes: 0
From: Canton, GA
Troubleshooting help needed...
So here's the truck-
I have an 89 F250, 351W, C-6, no idea what transfer case however it is a manual shift rather than pushbutton (I can go look if it'll help with regard to diagnostics).
The motor is worn out and it seems as though very little upkeep was done so I've done some tune-up work as well as the first change of tranny fluid (130k too much before the first tranny service you think?? Luckily I knew it was a beater going into the deal).
Now for the problem -
It runs as well as can be expected with no load, accelerates fine, the 4x4 seems to work okay etc. However with a load (approx 6k boat uphill) it just flat out won't go - except in 4 lo. No change with any gear selection. Slight change possibly in 4 hi but that could be my imagination. However if I shift it into 4 lo and drop the tranny into drive it you can feel everything lock in and it'll go fine.
Thanks for any ideas!
I have an 89 F250, 351W, C-6, no idea what transfer case however it is a manual shift rather than pushbutton (I can go look if it'll help with regard to diagnostics).
The motor is worn out and it seems as though very little upkeep was done so I've done some tune-up work as well as the first change of tranny fluid (130k too much before the first tranny service you think?? Luckily I knew it was a beater going into the deal).
Now for the problem -
It runs as well as can be expected with no load, accelerates fine, the 4x4 seems to work okay etc. However with a load (approx 6k boat uphill) it just flat out won't go - except in 4 lo. No change with any gear selection. Slight change possibly in 4 hi but that could be my imagination. However if I shift it into 4 lo and drop the tranny into drive it you can feel everything lock in and it'll go fine.
Thanks for any ideas!
Last edited by WERA; May 16, 2003 at 07:53 PM.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Troubleshooting help needed...
You should change the fluid & filter again as soon as possible. Putting fresh fluid in where REALLY old fluid was can loosen up lots of deposits, and destroy the transmission. Changing it the second time dumps them, leaving the transmission in as good condition as possible, but it may already be shot.
The t-case is a BW-1356, but it has nothing to do with the power you feel, other than the torque increase just by using low range.
You should NOT shift into 4 at speed, unless the hubs are already locked, and you shouldn't lock them for normal driving on any high-traction surface. You can damage the t-case.
The t-case is a BW-1356, but it has nothing to do with the power you feel, other than the torque increase just by using low range.
You should NOT shift into 4 at speed, unless the hubs are already locked, and you shouldn't lock them for normal driving on any high-traction surface. You can damage the t-case.
Thread Starter
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New User
Joined: Apr 2003
Posts: 2
Likes: 0
From: Canton, GA
Troubleshooting help needed...
Thanks, I'll try flushing the tranny again. It's still odd though because the tranny isn't slipping (btdt). It's not really even revving that high so it could just be the motor is too weak...
