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Tractor Talk Discussion Forum

auto tranny

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D17 man

02-05-2007 15:52:53




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im lookin at a 85 chevy pickup with i think a turbo 350 or 400 tranny. the guy says he saw tranny fluid under the truck and dont know where it leaked from but it shifts and drives smooth. when i look at it what should i look for any tips?




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Hobo,NC

02-05-2007 18:33:36




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
Many were swapped back to a 350 and rite many came from the factory with a 350C, rite many also could have a 400 if ordered that way. Those wif the 700 were rite much better on fuel than the others although problematic cuzz fix’in them wuz not perfected at the time, it wuz a learing curve like enny thang else. Bob hit it on the head but would also add the speed-o drive housing leaks, rite many problems wif leak'in. Either way its rite EZ to seal up. It could be as simple as a cooler line leak'in. The second gear accumulator will leak rite bad also but only while second gear izz applied so you have to look at the accumulator while the trans izz shif'in from first to second, it will only leak then and stop once it shifted to 3rd gear.

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McRay

02-05-2007 16:32:50




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
I have had Front pump seal leaking if setting at idle and it drips every so often, that sometimes means that the front pump bushing is worn very comon on 350 & 400 transmittion. Also check were the modulater, have had them leak around o"ring.



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frankiee

02-05-2007 16:20:24




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
Some times the tail stock seal would leak.
Look to see if fluid is leaking from the rear of the transmission where the drive shaft goes in.
If it is leaking there, then wiggle the drive shaft input up and down. There could be excessive play. If so, it is not that big of a deal because you can change tail stocks with a good bushing easy enough.



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Bob

02-05-2007 16:15:57




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
When a vehicle is used on a regular basis, a large percentage of the ATF stays in the torque convertor.

If it sits unused, as the days and weeks go by, the convertor drains back into the transmission pan, raising the oil level WAY above the "running" level.

So, if the pan gasket leaks, the shift shaft seal is bad, or the modulator "O" ring, or the kickdown/TV cable or it's seal are leaking, the oil will leak out.

When you start and run and drive the vehicle, the oil levels again drops when the convertor fills, and the leak MAY stop, until it sits again for at least a day or two.

For what it's worth, the FACTORY transmission in that pickup would be a 700-R4, unless it's a HD unit, then a THM-400 would be an option.

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D17 man

02-05-2007 16:15:42




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
yup, im hopin its somthing simple like a line. and yea i deffinetly wont buy it if it has a 305. i never did like those motors. gotta have a 350



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mike a. tenn.

02-05-2007 16:07:07




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
D17...the lines to and from the trans fluid cooler in the radiator can spring a leak too.

-mike



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2x4

02-05-2007 15:57:51




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
first check the small tube that holds the fluid check stick. Sometimes the "O" ring in the block will dry out & leak, especially in an older vehicle.



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Allan In NE

02-05-2007 15:57:40




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
I'd make sure it didn't have the 305 engine.

Allan



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old

02-05-2007 15:56:41




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 Re: auto tranny in reply to D17 man, 02-05-2007 15:52:53  
Drive shaft seal is common to leak if it has sat any time at all. Also could be the pan gasket, but I'll almost bet on the drive shaft seal. Pain to put in but its about a $5 part



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Pitch

02-05-2007 16:25:57




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 Re: auto tranny in reply to old, 02-05-2007 15:56:41  
Whats wrong with a 305? I've got an '89 halfton with the 305 123,000 miles smokes a bit on start up after sitting over nite (valve seals) but other than that I'm figuring on another 10 years out of it.



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old

02-05-2007 18:04:33




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 Re: auto tranny in reply to Pitch, 02-05-2007 16:25:57  
305 is and engine not a tranny. The 350 and 400 are both engines but they are also tanny numbers and I do believe hes talking about trannys here,not engines



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D17 man

02-05-2007 18:16:18




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 Re: auto tranny in reply to old, 02-05-2007 18:04:33  
i was talking motors in reply to allan in NE. i guess i never liked 305 motors. iv'e never had one but i just heard they were a smaller version of the 350 to sve fuel and they didnt turn out great and had crank problems. i also want a little bigger motor to hual stuff



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old

02-05-2007 18:38:30




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 Re: auto tranny in reply to D17 man, 02-05-2007 18:16:18  
I saw that when I went and looked at what every body had said. From what I was always told about the 305 it was just a 283 that they opened up a little more, but when they did that they made a good engine bad.



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Bob

02-05-2007 19:18:47




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 Re: auto tranny in reply to old, 02-05-2007 18:38:30  
A 305 is simply a 350 with a smaller bore. The stroke is the same. There's NO basis in fact for it to be any worse (or better) than a 350, outside of the fact it has less displacement and power.



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Bob

02-05-2007 19:21:05




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 Re: auto tranny in reply to Bob, 02-05-2007 19:18:47  
P.S....

SOME 305 AND 350 crankshafts have the same CASTING number, although they are balanced differently, due to the difference in piston weight.



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Bob

02-05-2007 19:18:40




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 Re: auto tranny in reply to old, 02-05-2007 18:38:30  
A 305 is simply a 350 with a smaller bore. The stroke is the same. There's NO basis in fact for it to be any worse (or better) than a 350, outside of the fact it has less displacement and power.



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