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Old 05-05-2009, 07:13 PM
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Question on 700r4 transmission tail shaft and front shaft

Hello guys I am getting ready to swap out a 700r4 tranny for a turbo 350 in my 96 chevy s10 and I have read that gm went from a 27 spline to a 30 spline on the 700r4's on the input shaft. Ok I am a rookie here so please be kind is the input shaft the front shaft that the torque convertor goes on? Or is the input shaft the tail shaft? Sorry I have read that I can use the tailshaft already on my truck for my 350 turbo. So am I correct then the front pump shaft was changes from 27 to 30 spline and the tail shaft is still 27 spline on all 700r4's? Thanks for anyones help.
Eric

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Old 05-05-2009, 07:22 PM
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Yes, the change was to the input splines. The output splines are still the same 27 spline as the TH 350.
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Old 05-05-2009, 07:23 PM
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Awesome dude thanks for the confirmation. Have a good one
Eric
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Old 05-05-2009, 07:30 PM
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the tail end of the trans has the out put shaft.... that puts the input shaft at the front of the trans,
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Old 05-05-2009, 09:09 PM
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If you use a TH350 with a 9" tail housing from a truck or van it's the same length as the TH700R4. So you wont need a longer driveshaft.
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Old 05-05-2009, 09:47 PM
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Quote:
Originally Posted by SSedan64
If you use a TH350 with a 9" tail housing from a truck or van it's the same length as the TH700R4. So you wont need a longer driveshaft.

I am curious what he going to do when the PCM sets a hard trouble code when it does not see the 4L60E trans feed back? Or has the computer systems been removed?
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Old 05-05-2009, 10:28 PM
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Quote:
Originally Posted by Crosley
I am curious what he going to do when the PCM sets a hard trouble code when it does not see the 4L60E trans feed back? Or has the computer systems been removed?
Good catch Crosley, I just saw the 96 yr model. Hopefully no PCM.
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Old 05-06-2009, 03:31 AM
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Quote:
Originally Posted by eric32
Hello guys I am getting ready to swap out a 700r4 tranny for a turbo 350 in my 96 chevy s10 and I have read that gm went from a 27 spline to a 30 spline on the 700r4's on the input shaft. Ok I am a rookie here so please be kind is the input shaft the front shaft that the torque convertor goes on? Or is the input shaft the tail shaft? Sorry I have read that I can use the tailshaft already on my truck for my 350 turbo. So am I correct then the front pump shaft was changes from 27 to 30 spline and the tail shaft is still 27 spline on all 700r4's? Thanks for anyones help.
Eric
The INput shaft is the shaft that transfers power INto the transmission.

The OUTput shaft is the shaft that transfers power OUT of the transmission.

The 700 had both 27 and 30 spline inputs.

Transmissions with the Chevy V8 (pointed top) bell from 1982 thru mid 1984 had 27 splines.
Transmissions with the Chevy V8 (pointed top) bell from late 1984 to end of production had 30 splines.
Transmissions with the S10 (flat top) bell always had 27 splines.

All 700 outputs are 27 splines.
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Old 05-08-2009, 10:01 PM
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wait what ?! there were some 27 spline input 700r4 after 84 ??! omg!


the only thing i could find anywhere on the internet is this:

GM 1982-92 TH-700R4, S10, S15, 2WD, 27 spline 2.8 L V6, 2WD

from TCI website torque converters section of the site.


says nothing about any other engines besides the 2.8 though.

hmmm..

i never knew there was a such thing as a 27 spline 700r4 input shaft after '84!
so i have learned something new just now! wow! how interesting!
anyone know more on this ?
what about the '85-up 4.3L 700r4 trannies ? etc ?

Last edited by fast68; 05-08-2009 at 10:57 PM.
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Old 05-10-2009, 01:59 AM
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Quote:
Originally Posted by fast68
what about the '85-up 4.3L 700r4 trannies ? etc ?
4.3L used the pointed top bell, so ..........

Transmissions with the Chevy V8 (pointed top) bell from 1982 thru mid 1984 had 27 splines.
Transmissions with the Chevy V8 (pointed top) bell from late 1984 to end of production had 30 splines.
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Old 05-10-2009, 03:23 AM
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well yeah i know the 4.3L is the 90 degree chevy pattern, of course haha


pointed top just means chevy 90 degree bolt pattern housing of course

and so that means the 4.3L ones must be 30 spline;
same as v-8 ones 85-up then.


and then apparently the 60 degree bolt pattern 700r4's are the only ones that are 27 spline after 84.


i just never knew there were any 27 spline 700r4 after 84 at all.

and im not too sure that many other ppl realize/know it either.

great to learn something new yay- even after i thought i knew all there was to know about the GM spline counts and bellhousing patterns all these years, haha

hmm....

Last edited by fast68; 05-10-2009 at 03:40 AM.
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Old 05-10-2009, 12:03 PM
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LOL.

Now I am going to throw you another curve ball.

Input shafts with a polished tip from 1982 thru mid 1984 had 27 splines.
Input shafts with a polished tip from late 1984 to end of production had 30 splines.
Input shafts with NO polished tip always had 27 splines.

And another.

1982-1983:
All input shafts were 7/8" diameter and had 27 splines.

1984:
Some input shafts with a polished tip were 7/8" diameter and had 27 splines.
Some input shafts with a polished tip were 7/8" diameter and had 30 splines.
Some input shafts with a polished tip were 1" diameter and had 27 splines.
Some input shafts with a polished tip were 1" diameter and had 30 splines.
Some input shafts without a polished tip were 7/8" diameter and had 27 splines.
Some input shafts without a polished tip were 1" diameter and had 27 splines.

1985-up:
All input shafts with a polished tip were 1" diameter and had 30 splines.
All input shafts without a polished tip were 1" diameter and had 27 splines.

For a total of 6 different input shafts.


Are you dizzy yet?
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