Another NP435 problem

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Jan 23, 2005 | 04:42 PM

eetmyshourts

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From: Trumbull Ct.

Another NP435 problem

After switching to synthetic gear oil for some reason my tranny is having a really hard time getting into and out of all gears but especially 2nd. When going into gear it feels like im almost hitting something or somethings blocking me to get into gear theres no grinding so im guessing the clutch is ok. what could this be. i have to check the fluid and make sure all the bolts are there and tight and possibly adjust the clutch but what else could make it do that ...synchros?

also this happens when the tranny is warm or cold.

Thanks
-Aj

Jan 26, 2005 | 09:41 AM

eetmyshourts

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From: Trumbull Ct.

any ideas yet?

Jan 26, 2005 | 05:42 PM

jstandle

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From: USA

Maybe not thick enough to allow the transmission to shift smoothly? not sure.

Jan 27, 2005 | 09:12 AM

jpb222

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From: Somerset, Pa

Have you tried adjusting the clutch yet?

I have found that having the clutch start to slip 2 inches from the top of it's travel works best for me.

Jan 27, 2005 | 09:38 AM

VZ29N

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Joined: Sep 2003

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I'm getting ready to swap in one of those in my 73 Bronco. If it were
me I would drain out the culprit oil and put back in what you were
running, that is if it was fine before. Maybe it just doesn't like the
oil you put in. MY .02

Jan 27, 2005 | 07:27 PM

eetmyshourts

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From: Trumbull Ct.

no jpb222 i havent adjusted the clutch yet. it probably needs it but i figured it would grind if it was the clutch. thats the next thing on my list tho. Its just so darn cold here and i hate being in the garage. I only have little heater so its brutal.

Jan 27, 2005 | 11:35 PM

Kenworth

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Joined: Aug 2001

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You don't need to run Synthetic oil in a NP435 drain it out and put regular 80-90 weight back in. These old 4spd gear grinders are tough as nails I rarely changed the oil in mine it really wasn't needed.

The oil has to be thick enough to cling to the gears and sling around the gear case to lubricate all the syncros etc. I don't know what weight of Synthetic or brand you are using but it maybe too thin so its not clinging to the internals.