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04-16-2009, 02:28 AM
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#1 |
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Registered User
Join Date: Nov 2006
Location: Amman, Jordan
Posts: 121
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help with manual transmission
Hi all I’m facing something with may manual transmission, it is hard to shift backward and it is impossible to shift to the 1st while my truck moving.
I changed the transmission oil. Where to look? |
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04-16-2009, 02:45 AM
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#2 |
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Registered User
Join Date: Feb 2009
Location: slurrey, bc.
Posts: 1,134
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Re: help with manual transmission
is your clutch disengaging? still have syncros?
__________________
-'73 c/10 - Low with Go - will be complete... probably never. -'90 2wd Blazer - well... soon enough anyways. -'84 SWB - the daily gas guzzler. |
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04-16-2009, 03:35 AM
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#3 |
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Registered User
Join Date: Nov 2006
Location: Amman, Jordan
Posts: 121
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Re: help with manual transmission
i'm not sure if i'm following you correct
once the gear is in place it does not disengage... |
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04-16-2009, 03:40 AM
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#4 |
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Registered User
Join Date: Sep 2000
Location: Gold Bar, WA
Posts: 1,216
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Re: help with manual transmission
Which manual transmission do you have? If it is the SM-465, first and reverse do not have syncros so that can happen. I have that tranny in my burb and sometimes I have problems getting it in reverse...usually I put it in neutral and let out the clutch to get things spinning a bit and then try to shift back in to reverse. First gear is so low I don't even try to shift to first while moving.
__________________
My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28 |
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04-16-2009, 03:44 AM
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#5 |
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Registered User
Join Date: Nov 2006
Location: Amman, Jordan
Posts: 121
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Re: help with manual transmission
i think the transmission is NP435 the combination of gears
L 2 n 1 3 R when shifting from 3rd to 2nd is difficult and to the 1st not to L |
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04-16-2009, 08:06 AM
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#6 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: help with manual transmission
The 2 tranny's are virtually identical. Down shifting has always been an issue with them if you try it at to high a speed. Try keeping the truck below 25 mph and run thru the gears nice and easy. 1st and rev have no syncros so those will grind. 2, 3 and 4 should shift quietly and fairly easily if speed is low enough. If tranny is quiet in all forward speeds chances are it's OK. If you still have trouble, look at clutch adjustment. 2 inches free travel in pedal is about right. These tranny's are bullet proof and last forever. I have a 465 in my 84 and it's comming up on half a million miles and it works like new. Let us know, jim
__________________
1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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04-16-2009, 09:57 AM
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#7 |
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Kid's Mechanic
Join Date: Nov 2006
Location: Kansas City
Posts: 8,241
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Re: help with manual transmission
How long have you had your truck? The truck 4 speeds will not operate like a car 4 or 5 speed.
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