tranny leak and slip
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Junior Member
Joined: Dec 2005
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tranny leak and slip
1988 f150 302 automatic tranny. Rebuilt the engine. Tranny worked fine before I pulled the engine out. When I was dropping the engine in to fasten it to the tranny it moderately bumped against the tranny when it was about an inch away from it. Other than that the install went fine and truck runs great except. Now I have a small leak from the trans (maybe one or two drips when parked over night). As long as I keep the correct fluid level is drives and shifts fine (no shudders, clunks etc.) but if I let the fluid get low that's when it starts slipping. Any suggestions?
Junior Member
Joined: Apr 2007
Posts: 6
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I don't normally use this site but I have a tranny problem as well and was hoping for some advise. I am not a professional mechanic but I have modified the tranny and rebuilt the motor on my 95 F-150. I do know some simple suggestions that may help fix your problem:
1. If tranny fluid gets too low it will slip...low fluid should always be avoided. It can also heat up your tranny dangerously so keep the level up.
2. You have to fix your leak. Take some degreaser and alot of rags and make sure your transmission is spotless (especially around the pan, oil cooler lines (if you have one), extension housing to transmission gasket, and the rear seal.
3. After the tranny is spotless, take it for a drive. Make sure the truck gets up to operating temperature and vary your speed and gears you use.
4. Park the truck on level ground and place some cardboard underneath. Look for any obvious leaks. If you don't see any then let it sit and see if there are any drips on the cardboard. Usually if it is coming from the pan gasket it will leak when sitting there although I had a problem w/ a leak from the transmission to extension housing gasket. If it only appears to leak when you are driving then it usually comes from an area that is under pressure (has alot of fluid flow) under load...look for a leak at the oil cooler lines and rear seal.
Again, just some simple things that I learned. May not help you but you should be able to identify where the leak is coming from w/ a clean start and a little patience.
Good luck, Nick
1. If tranny fluid gets too low it will slip...low fluid should always be avoided. It can also heat up your tranny dangerously so keep the level up.
2. You have to fix your leak. Take some degreaser and alot of rags and make sure your transmission is spotless (especially around the pan, oil cooler lines (if you have one), extension housing to transmission gasket, and the rear seal.
3. After the tranny is spotless, take it for a drive. Make sure the truck gets up to operating temperature and vary your speed and gears you use.
4. Park the truck on level ground and place some cardboard underneath. Look for any obvious leaks. If you don't see any then let it sit and see if there are any drips on the cardboard. Usually if it is coming from the pan gasket it will leak when sitting there although I had a problem w/ a leak from the transmission to extension housing gasket. If it only appears to leak when you are driving then it usually comes from an area that is under pressure (has alot of fluid flow) under load...look for a leak at the oil cooler lines and rear seal.
Again, just some simple things that I learned. May not help you but you should be able to identify where the leak is coming from w/ a clean start and a little patience.
Good luck, Nick
