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My 400 turbo tranny started slipping today and..

 
Longhorn396
V-6 Camaros rule!
Posts: 38
Joined: 04/09
Posted: 10/21/09 11:06 AM

I was wondering if it is going bad or if i need to rebuild it and put a shift kit in it.?? it goes through first and second ok but I have to shift the shifter into third or it will slip. When i do it manually its ok but when its by itself it slips. I need some websites with nice cheap 400's and or rebuild kits and shift kits.  

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69nova355.
I mow my lawn and find Chevys
Posts: 2560
Joined: 08/09
Posted: 10/21/09 01:55 PM

is it old? you checked fluid im sure.sounds like rebuild is coming soon.  

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 10/21/09 06:11 PM

Kits are cheap but the main question is can you build it yourself or are you gonna take it to a trans shop?  
luck is when skill and opportunity meet

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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1760
Joined: 08/09
Posted: 10/21/09 09:24 PM

i had my th350 built last year for 600  
p2-72chevelle383

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blacksheep84
I have an SS396 tatoo
Posts: 350
Joined: 02/09
Posted: 10/21/09 10:45 PM

shift kits sometimes correct problems. they are sometimes called correction kits , shift improver ext. you can also upgrade the valves for higher pressure ones and that will help promote better shifting and lubrication.

i learned alot from this website , they have an extensive amount of parts. they also offer tip sheets for some transmissions.

http://www.400raptor.com/  

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Longhorn396
V-6 Camaros rule!
Posts: 38
Joined: 04/09
Posted: 10/22/09 11:04 AM

Well the fluid is good. but my dad said maybe the modulator is dirty and or the filter. Its in a 69 Chevy CST20 longhorn 3/4 ton truck. I can so the kit myself and not so sure about the shift kit. Im changing both filter and the modulator this weekend so it might fix it.  

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 10/22/09 06:48 PM

Dirty fluid or filter will def cause trouble in an automatic  
luck is when skill and opportunity meet

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Longhorn396
V-6 Camaros rule!
Posts: 38
Joined: 04/09
Posted: 10/23/09 06:16 AM

Its kinda fraking me out cause I dont have 1200 for a new quality built tranny. Or even money for a complete rebuid so I thought I would come on here and ask some possible problems.  

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 10/24/09 05:48 AM

1200 bucks is way to much for a stock 400 trans. You can buy a good one for less than a grand. It costs bout $350 to get one rebuilt with a convertor where I live. First thing is to change fluid and filter to see if it helps  
luck is when skill and opportunity meet

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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1760
Joined: 08/09
Posted: 10/24/09 06:41 AM

350 is a good deal 600 is cheap around here  
p2-72chevelle383

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 10/25/09 06:08 AM

It helps to have friends in the transmission biz.p2 what part of the country do you live?  
luck is when skill and opportunity meet

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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1760
Joined: 08/09
Posted: 10/25/09 06:24 AM

flint,mi.best tranny and rear end guy in the city did my tranny for 600 and rebuilt my 10-bolt with a 3.73 posi for 900(1500).where do you live?  
p2-72chevelle383

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 10/25/09 06:28 AM

Close to athens,ga. I do my own rearend set-ups but I get trans work done so cheap I've never tackled a rebuild myself. If I ever lose my connections I will have to learn to do that to! lol  
luck is when skill and opportunity meet

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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1760
Joined: 08/09
Posted: 10/25/09 07:04 AM

ya you cant beat $350.i wouldnt even care if i broke it if thats all it cost me  
p2-72chevelle383

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gettnlarge01
I mow my lawn and find Chevys
Posts: 3330
Joined: 09/09
Posted: 10/25/09 07:09 AM

Yeah if it only lasted 20,000 miles it would be a deal considering most projects dont see 5,ooo mlies a year  
luck is when skill and opportunity meet

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