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Unread 08-16-2010, 10:24 PM   #1
Wrangler_91
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1998 TJ Wrangler 
 
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96 F-150 transmission noise help

I could post this in a ford forum but I am here more often so I figured I would just ask here. My tow rig (96 f-150) has some noise coming from the manual transmission. When you start out in first, there is a light grinding noise coming from the tranny. It also does it in second but not as bad. All other gears are fine. The truck gets into gear without a problem, it's just when you start to apply gas that you get the noise. I am no transmission expert by any means and this noise has always bothered me.

the truck has 137,xxx miles on it so is it probably just wear in the gears or???
Just wanted to get some opinions. Not sure if this is simethingi should be worried about or not. Thanks.

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Unread 08-18-2010, 12:20 PM   #2
ecaps
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Have you checked the fluid in it recently? The reason I ask, is because on the manual transmission there are 3 rubber plugs on the back and over time they shrink, become brittle and the fluid begins to leak out of them. I would recommend changing them either way since it's not extremly difficult. A 5/8" metal freeze plug fits in there perfectly and you never have to worry about it again. My F150 began rattling, thought the pilot or throwout bearing was going out. After checking it was low on fluid and those plugs had shrunk.
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Unread 08-19-2010, 07:30 AM   #3
Wrangler_91
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I just checked the fluid and it is full right up to the fill plug. Thank you for the suggestion. Any other ideas guys?
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Unread 08-21-2010, 05:45 PM   #4
TOWMAN35
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syncros or like you said the wear and tear. is it 4wd?
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Unread 08-23-2010, 07:03 PM   #5
Wrangler_91
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No it is not 4wd just 2wd. I wasn't sure if just wear and tear would produce that noise or not.
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Unread 08-28-2010, 09:47 AM   #6
jose_p_adams
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1997 TJ Wrangler 
 
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Check the tow rating on your truck. With that manual transmission, it's not even close to the weight of a jeep and trailer combo or even a jeep. IIRC it is around 3,500 lbs. I'd say if you were doing a lot of towing, the noise you hear is the tranny starting to break down.
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Unread 08-28-2010, 09:29 PM   #7
Wrangler_91
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1998 TJ Wrangler 
 
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Location: louisville, KY
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The tow rating is arguable. Technically it is only 2,000 lbs with the 5 speed but the automatics are around 7,000 lbs. I read up a lot on it and the general consensus is that Ford knocked down the tow rating on the 5 speeds so that they wouldn't have people bringing the truck back in after smoking the clutch by riding the clutch while pulling a load.

I have done next to no towing with the truck as a matter of fact. Before I owned the truck there wasn't even a trailer hitch installed (or mounting holes in the frame) so I don't think it has ever been used for towing. The tranny was making the noise when I purchased the truck too.
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Unread 08-30-2010, 12:51 PM   #8
bruteboy
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sounds like the rear(mainshaft) bearing may be worn out.
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Unread 09-01-2010, 10:19 AM   #9
jose_p_adams
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Could be. My original transmission died around the 150,000 mile mark so I am probably biased.
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