Gear wont shift!!!!!!!

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Jun 20, 2007 | 06:35 PM

86I6WontStart

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Gear wont shift!!!!!!!

Hey guys , heres my question, it just started this afternoon.
I have now a 79 f-150 I-6 god truck, but at the light I took off first, then 2nd, then 3rd but I wanted to downshift back to 2nd I coulnt, went back to third.
I got home got underneath, i didnt see anything abnormal, so i went around the corner, first ok, 2nd ok, 3rd ok, 4th ok. came to stop sign first ok, 2nd ok, 3rd made a small grinding noise and a clunk, then 4th ok.

Again stop sign first ok, 2nd ok, 3rd ok, need to turn wanted to downshift to 2nd but I coulnt, so i tried go tofirst no problem, then2nd ok, 3rd ok and I got home

tranny is the one that comes with 3 small feet if you know what i mean??
Please any advise will help.
Thanks

Last edited by 86I6WontStart; Jun 20, 2007 at 06:37 PM.

Jun 20, 2007 | 07:35 PM

Jermafenser

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From: MD

No, I don't know what you mean regarding the transmission.

It's either:

New Process 435 or Borg-Warner T-18. That's a toploader transmission, 4-speed, very long shifter. Or it has the Clark 4-speed overdrive transmission with the shorter shifter that's closer to the bench seat.

Jun 20, 2007 | 08:41 PM

Mrcorey5

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From: Topeka, Kansas

I am puzzled also,please elaborate.

Jun 20, 2007 | 08:57 PM

86I6WontStart

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Ok heres again: Truck has manual transmission, i cant go to 2nd gear .
but thats not all the time.
Sometimes it will go if i shift it nice and slow.
now i shift first then third because 2nd its hard to do it.

Thanks

Last edited by 86I6WontStart; Jun 20, 2007 at 09:00 PM.

Jun 21, 2007 | 07:19 PM

86I6WontStart

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the truck has a
Clark 4speed o/d, short shifter close to the bench.

Jun 21, 2007 | 07:22 PM

73f350sc

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From: Murray

Sounds as if you just need a rebuild on the tranny...but...go under it and make sure that all of the linkages are connected and in good working order as well.
-Chris

Jun 21, 2007 | 09:43 PM

Jermafenser

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From: MD

It's been said (no personal experience...) that the Clark OD unit does not like being abused. It's a light duty transmission, that's for sure. Assuming you were always easy on it, it may be the synchronizations may be worn out from wear and tear.

To check for this, pull the top cover and look at its internals. The brass synchronizations should have sharp edges on the teeth. If they're worn off, then you have found the problem you're experiencing. The other thing is, from what I read, the gears between 1 and 2 is a WIDE jump, so that is already troublesome if you're not keen on it.