Trany Splines - need answer fast - The 1947 - Present Chevrolet & GMC Truck Message Board Network

apstguy · 03-02-2004, 07:24 PM

Does my stock 85 TH700 come with a 27 or larger spline?

apstguy · 03-02-2004, 08:23 PM

ttt

TIMSPEED · 03-02-2004, 10:09 PM

I'm 90% sure it's a 27, I don't think they used the 30 spline until 87...

**swervin ervin** · 03-02-2004, 10:21 PM

There are basically 3 versions of the 700r4. From '82 until '84 there was a small-input-shaft unit with the same spline as the 200c transmission. From '85 to '87 there was a large input shaft version, which has the same spline as a 350 trans. The early torque converter ('82-'84) will not install, so there is no danger of using the early torque converter on the large shaft. From '87 1/2 up, the large shaft is still used, but GM incorporated an auxilary valve body to cushion engagement into drive.

*mike reeh* · 03-02-2004, 10:34 PM

Ummm are you talking about input shaft or output shaft? I would assume output shaft. 700r4, like its brother the th350, are 27 spline

mike

gchemist · 03-03-2004, 12:23 AM

82-84 27 spline
85+ 30 spline
One reason I had a 85 Camaro 700R4 core rebuilt for my truck.

apstguy · 03-03-2004, 02:53 AM

I thought it was 30 but I wanted to make sure. Bowtie Overdrives TH700 is now ORDERED!!! They use an 88-93 core but do have a 27 spline version. Score! I'm EXCITED!

gchemist · 03-03-2004, 07:11 AM

Why would they go back to a 27 spline? Unless its hardened. GM went to a 30 spline because stouts engines would strip the input shaft.

apstguy · 03-03-2004, 02:55 PM

For pwople who needed it??? I dunnno.

03-02-2004, 07:24 PM	#1
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Trany Splines - need answer fast Does my stock 85 TH700 come with a 27 or larger spline? __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

03-02-2004, 08:23 PM	#2
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	ttt __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

03-02-2004, 10:09 PM	#3
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	I'm 90% sure it's a 27, I don't think they used the 30 spline until 87... __________________ I have a few cars... See Them Here

03-02-2004, 10:21 PM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	There are basically 3 versions of the 700r4. From '82 until '84 there was a small-input-shaft unit with the same spline as the 200c transmission. From '85 to '87 there was a large input shaft version, which has the same spline as a 350 trans. The early torque converter ('82-'84) will not install, so there is no danger of using the early torque converter on the large shaft. From '87 1/2 up, the large shaft is still used, but GM incorporated an auxilary valve body to cushion engagement into drive. __________________ Mike 1985 Chevy C-10

03-03-2004, 12:23 AM	#6
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	82-84 27 spline 85+ 30 spline One reason I had a 85 Camaro 700R4 core rebuilt for my truck. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-02-2004, 10:34 PM	#5
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	Ummm are you talking about input shaft or output shaft? I would assume output shaft. 700r4, like its brother the th350, are 27 spline mike

03-03-2004, 02:53 AM	#7
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	I thought it was 30 but I wanted to make sure. Bowtie Overdrives TH700 is now ORDERED!!! They use an 88-93 core but do have a 27 spline version. Score! I'm EXCITED! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

03-03-2004, 07:11 AM	#8
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Why would they go back to a 27 spline? Unless its hardened. GM went to a 30 spline because stouts engines would strip the input shaft. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-03-2004, 02:55 PM	#9
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	For pwople who needed it??? I dunnno. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

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