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Author Topic: 78 4x4 help needed  (Read 4455 times)

Offline DirtyShawn

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78 4x4 help needed
« on: April 04, 2010, 10:48:13 pm »
OK guy i was on my way don't the road to a small mud hole i have been playing in. then i turn the corner
and shifted in to 2nd and heard a noise and bam the hole truck locked up! first i was thinking i broke a ring or pinion.
so after playing with the shifter i found i had 1 gear and all my hi and lo in the tranfercase worked. so i drive home but when it shifted in 2 to locked onces more so once more i put it in first gear and it moved fine. then i try ed 2nd and 3rd and it feel like something is holding the trans from working.
my friend say its stuck in 2 and 3 gear at the same time is this so if so what do i do? and so i don't forget i have a th400 with a revs valve body and a Np 203.
so since the day i got it iv have to shift it with the cheata shifter in the truck. not sure what to do. can i just get a 700r4?
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Offline Chevalade

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Re: 78 4x4 help needed
« Reply #1 on: April 05, 2010, 12:03:48 am »
Get the 400 rebuilt.....cheaper and stronger
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Offline VileZambonie

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Re: 78 4x4 help needed
« Reply #2 on: April 05, 2010, 07:07:40 am »
When did you do the valve body? Drop the pan and make sure the gaskets and seperator plate are in tact, no bolts falling out etc.
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Offline DirtyShawn

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Re: 78 4x4 help needed
« Reply #3 on: April 05, 2010, 07:37:39 am »
its a built tranny but i didn't do it.
i don't like having to shift it all the time.
i was told its out of a stock car.. i just don't know
i do know its has a mean shift kit. but when all this happen i was going about 10mph
i just not sure of what to do. any one got a clue what the cost to have it fixed
and why is it only binding in 2-3 gears but first and rev's are fine. even the transfercase works right in first gear

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Offline Chevalade

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Re: 78 4x4 help needed
« Reply #4 on: April 05, 2010, 04:59:39 pm »
Why not just put a standard valvebody in it, and drive it like a normal person.
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Offline DirtyShawn

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Re: 78 4x4 help needed
« Reply #5 on: April 11, 2010, 02:11:08 pm »
THATS WHAT I WOULD LIKE TOO DO.
I'm not much for alot of mud or rock but i like the look of the high 4x4.
I'm slowly finding out things about my truck.
today i found i have a th400 bolted to a NP205. i was told i had a 203..

i still don't know why i can't move in 2 or 3 gears.. its not in the tranfercase
that all works. so must be in the trans. i looked and found the modulator valve is gone in the trans why?
my buddy says some one dumped alot of cash to make the th400 bolt to a NP205 and do the conversion for 2 wheels drive.
i did find the last owner was a UMP Modified drive. so I'm guessing this is why i have a four link and the th400 with the slap shifter
so the trans should be built real nice I'm hopping.  is there any thing i can do to unstuck my trans?
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