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Old 03-18-2005, 07:57 PM
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700r4 to 350 turbo.

I have a 1989 chevy silverado (305) with (correct me if im wrong) a 700r4 transmission. The trassmission has been acting up lately (sluggish and slipping in and out of Over drive). I replaced the filter only to find a large amount of powder fine medal flakes in the pan. We are considering replacing the transmission all together considering it has almost 200k miles, with something beefier (we use the truck for heavy hauling use on our farm). From what I understand a 350 turbo should bolt up with lil work needed. Any suggestions on what kind of transmission I should use or how to put in a 350 turbo?

Thanx,

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Old 03-19-2005, 08:04 AM
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If your truck has a 700r4 now and you want to swap to a 350 there are two major differences youll have to address. One is the length of the transmission - the 350 is somewhat shorter than the 700r4 hence youll need a longer driveshaft, by 3.25". Second the tranny cross member will have to be moved forward I think about 6 inches. With some vehicles that might be a problem because of welded in cross members. The ony onther thing to consider is the overdrive, 700r4 has it - 350 doesnt. That may not matter considering your using it on the farm.
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Old 03-19-2005, 10:52 AM
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the t-350 was built in 5 different lengths.


3 different 2 wheel drive lengths ( 6 inch , 9 inch , 12 inch tail housings) and 2 4x4 shafts were used.

the 9 inch tail housing length on the t-350 will match the length of the 700r4 tranny in a 2 wheel drive application


Quote:
Originally Posted by 70chevyc10
If your truck has a 700r4 now and you want to swap to a 350 there are two major differences youll have to address. One is the length of the transmission - the 350 is somewhat shorter than the 700r4 hence youll need a longer driveshaft, by 3.25". Second the tranny cross member will have to be moved forward I think about 6 inches. With some vehicles that might be a problem because of welded in cross members. The ony onther thing to consider is the overdrive, 700r4 has it - 350 doesnt. That may not matter considering your using it on the farm.
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Old 03-19-2005, 01:09 PM
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Hey 68Nova.....I just happen to have a 700R4 that was rebuilt a few years ago. Drop me a PM if you are interested.

Kevin
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Old 03-19-2005, 02:06 PM
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Quote:
Originally Posted by 68novafan
I have a 1989 chevy silverado (305) with (correct me if im wrong) a 700r4 transmission. The trassmission has been acting up lately (sluggish and slipping in and out of Over drive). I replaced the filter only to find a large amount of powder fine medal flakes in the pan. We are considering replacing the transmission all together considering it has 100k+ miles, with something beefier (we use the truck for heavy hauling use on our farm). From what I understand a 350 turbo should bolt up with lil work needed. Any suggestions on what kind of transmission I should use or how to put in a 350 turbo?

Thanx,
Personally I think you would be taking a big step backwards going to a th350. 700's can be build very beefy there really is no advantage in going to a turbo 350 but you will lose alot
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Old 03-19-2005, 02:57 PM
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Quote:
Originally Posted by Robinson Robin
Personally I think you would be taking a big step backwards going to a th350. 700's can be build very beefy there really is no advantage in going to a turbo 350 but you will lose alot
According to his post, he just wants the truck for hauling things around the farm. He would have no need for overdrive in this situation.

Get the long tailshaft TH-350 and bolt it in your truck if that is cost efficient to you.
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Old 03-19-2005, 03:06 PM
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OK, I might as well stick with a 700r4 although the 350turbo conversion process doesn't sound to bad considering that the cross member is bolted on (I Removed it in aid of changing filter). The only problem I would see is that the drive shaft is one piece, changing to a 350turbo would make it rather long . Are there any other transmissions I might consider though?
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Old 03-19-2005, 05:37 PM
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Quote:
Originally Posted by Crosley
the t-350 was built in 5 different lengths.


3 different 2 wheel drive lengths ( 6 inch , 9 inch , 12 inch tail housings) and 2 4x4 shafts were used.

the 9 inch tail housing length on the t-350 will match the length of the 700r4 tranny in a 2 wheel drive application
Will this still require me to move the cross member?
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Old 03-20-2005, 08:50 AM
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If you change to a t-350 tranny from the 700 .... yes the crossmember will need to relocated a few inches.

This is a 2 wheel drive truck? 4x4 is a whole different story



Quote:
Originally Posted by 68novafan
Will this still require me to move the cross member?
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Old 03-20-2005, 09:46 AM
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Sorry,, Yes its 2wd. also, Would the current trans. Be worth rebuilding, what are the metal flakes a sign of? Im a transmission Newby.
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Old 03-20-2005, 11:54 AM
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i took a 350/350 out of a mid 80's 2wd and dropped them into a 83 trans am that had a 305/700r4. i did have to get a longer driveshaft , but to my suprise , the trans bolted right in the same place on the cross member.i must have just got lucky with the right tailshaft length.
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Old 03-20-2005, 09:50 PM
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I have what I believe to be a 200r4 transmission (got it out of a 88' caprice with a 4.3l, had overdrive), given thats its free I was wondering if it would hold up in the truck for a year or so as a bandaid (Till I get sum $$ for a better truck) if it where possible to put in, or if it would be cost effective to beef it up as a permanent fix, given its even possible to put in of course.

Last edited by 68novafan; 03-20-2005 at 10:24 PM.
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Old 03-25-2005, 08:07 PM
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any chance the toque coveter needing to be changed out with the transmission,,, i don't know much bout these things....thanx for the info thus far....
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Old 03-25-2005, 08:52 PM
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The T-350 mount is on the main case, not on the tailshaft housing. The 700R4 mount is about 2" farther to the rear than a T-350 mount. The 700R4 has the same overall length as a 9"-tail T-350, used from '73-'86 in 1/2-ton Chevy pickups (2WD). Your driveshaft should work fine with either one. Here's the TCI transmission dimensions chart:

http://tciauto.com/tech_info/trans_dims.htm

The 700R4 converter won't work on a T-350 without serious modification.
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Old 03-26-2005, 06:52 PM
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anyone have any thoughts on the 200r4 or is it that stuped of a question, lol
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