TH400 Slip Yoke - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C-Rat · 12-13-2010, 12:45 PM

I am in the process of trying to finish my project. It is a 1967 Shortbed. I've had this truck for almost 2 years now and ended up having to put it on the backburner for a little while. I bought a 350/350 from a wrecked corvette and also had a 69 long bed donor truck that had a 305, 400 trans and dana 60 rear. Well we decided to put the 350 motor in and the 400 trans. of course the donor trucks driveshaft was too long(and please don't ask what happened to the original yoke) so I got a driveshaft but can't seem to find a slip yoke for this truck. It is a 32 spline with no threaded hole. I went to the local shop and picked one up but it was too thick to fit in. Any help with be appreciated!

Allensracing · 12-13-2010, 12:53 PM

the 400 yoke is different from a 350 yoke. they will not interchange

C-Rat · 12-13-2010, 12:57 PM

Yes i know, have the 350 yoke sitting in my garage in a box of spare parts. The donor truck had the 400 trans in it, a two piece driveshaft and dana rear...it had the slipyoke for the tranny but unfortunately my "friend" who was helping with the build of the truck decided to keep it along with alot of my other parts for the truck.

Allensracing · 12-13-2010, 01:01 PM

in that case I am a bit confused. you picked up a th400 yoke and it didnt fit?
as far as I know there was two styles, either a slipyoke or a fixed u-joint on the back of the trans.
I am not aware of two styles of th400 slipyokes

C-Rat · 12-13-2010, 01:15 PM

See, thats what I thought too...I'm so frustrated! I'm ready to just put the 350 trans in(I have the yoke for that!)

Allensracing · 12-13-2010, 01:20 PM

post a picture of the back of the trans?

C-Rat · 12-13-2010, 01:27 PM

Allensracing · 12-13-2010, 01:28 PM

ok, i would say your right. looks like a regular 400 to me. did the guy selling you a yoke screw up?

C-Rat · 12-13-2010, 01:30 PM

Thats what I'm thinking...big company down here in Florida though. Going to try another shop and hope somebody there knows what i need. Thank you!

heymoe · 12-13-2010, 01:33 PM

Quote:

Originally Posted by Allensracing

ok, i would say your right. looks like a regular 400 to me. did the guy selling you a yoke screw up?

That looks just like my 400. I am also thinking they sold you the incorrect slip yoke.

*stich626* · 12-13-2010, 02:05 PM

pick up a new seal too. that ones ripped at 9 oclock

teeitup · 12-13-2010, 02:16 PM

I have a couple turbo 400 yokes out there for sale, if you need one. Thanks Randy

Lances69 · 02-02-2012, 12:56 AM

Hey guys, i think i might have a solution to the problem, see, i have a 69 longbed that came with a 350/400 combo and a 12 bolt rear end, and the 2 peice driveshaft, my carrier bearing went out and mees up all my u joints, when i was replacing them my slip yoke broke! So we ordered another off the internet thst fitmy ujoints(1310 series) and when i got it i went to install it and it didnt fit, i removed the seal and tried it then and i noticed that it bottoned out on the 4" tailhousing, i went back to my? Roken yoke and measured the ground hub(barrel) diameter with a digital caliper and then measured the new one and i noticed my old one came in at 1.688" and the new one came in at 1.885" hub diameter,. With a bit of reasearch i noticed that this combination was not widely used and not used for very long. Now im thinking about taking the new yoke to the machine shop to shave off .20" or returning it and spending more to get the right one.

Lances69 · 02-02-2012, 12:57 AM

Hey guys, i think i might have a solution to the problem, see, i have a 69 longbed that came with a 350/400 combo and a 12 bolt rear end, and the 2 peice driveshaft, my carrier bearing went out and mees up all my u joints, when i was replacing them my slip yoke broke! So we ordered another off the internet thst fitmy ujoints(1310 series) and when i got it i went to install it and it didnt fit, i removed the seal and tried it then and i noticed that it bottoned out on the 4" tailhousing, i went back to my broken yoke and measured the ground hub(barrel) diameter with a digital caliper and then measured the new one and i noticed my old one came in at 1.688" and the new one came in at 1.885" hub diameter,. With a bit of reasearch i noticed that this combination was not widely used and not used for very long. Now im thinking about taking the new yoke to the machine shop to shave off .20" or returning it and spending more to get the right one.

Livrat · 02-02-2012, 12:49 PM

Just an FYI..
68-70 truck T400's used a smaller outside diameter yoke so they had to use a thicker tailshaft bushing.
You are on the right track by having your current one shaved down to fit. Or find an early "truck specific" yoke.

mmmBoost · 02-02-2012, 10:24 PM

There is also 3 different length tailshaft housings for the TH400 over its entire build period

prostreetC-10 · 02-03-2012, 12:25 AM

The splines are the only thing that are the same. You can run either thickness yolk, you just have to get the correct seal.

Lances69 · 02-03-2012, 12:37 AM

Actually no becuase my extension housing holds the small shaft the big shaft bottomed out on the housing where the small shaft went inside the bushing in there, and the bigger seal will not fit in the housing either becuase i got one and it didnt fit,

prostreetC-10 · 02-03-2012, 12:54 AM

Okay then I'm not sure what you are talking about. I've never had these issues and TH400s are the only auto I have ever ran. Another day where I have learned something. The TH400 that is in my Camaro came out of a 68 longhorn with a BBC and TH400. I just got a car yolk and it slide right in. hmmm....

12-13-2010, 12:45 PM	#1
C-Rat Registered User Join Date: Dec 2009 Location: Fort Lauderdale FL Posts: 9	TH400 Slip Yoke I am in the process of trying to finish my project. It is a 1967 Shortbed. I've had this truck for almost 2 years now and ended up having to put it on the backburner for a little while. I bought a 350/350 from a wrecked corvette and also had a 69 long bed donor truck that had a 305, 400 trans and dana 60 rear. Well we decided to put the 350 motor in and the 400 trans. of course the donor trucks driveshaft was too long(and please don't ask what happened to the original yoke) so I got a driveshaft but can't seem to find a slip yoke for this truck. It is a 32 spline with no threaded hole. I went to the local shop and picked one up but it was too thick to fit in. Any help with be appreciated!

12-13-2010, 12:53 PM	#2
Allensracing Registered User Join Date: Dec 2010 Location: Paradise, ca Posts: 295	Re: TH400 Slip Yoke the 400 yoke is different from a 350 yoke. they will not interchange __________________

12-13-2010, 12:57 PM	#3
C-Rat Registered User Join Date: Dec 2009 Location: Fort Lauderdale FL Posts: 9	Re: TH400 Slip Yoke Yes i know, have the 350 yoke sitting in my garage in a box of spare parts. The donor truck had the 400 trans in it, a two piece driveshaft and dana rear...it had the slipyoke for the tranny but unfortunately my "friend" who was helping with the build of the truck decided to keep it along with alot of my other parts for the truck.

12-13-2010, 01:01 PM	#4
Allensracing Registered User Join Date: Dec 2010 Location: Paradise, ca Posts: 295	Re: TH400 Slip Yoke in that case I am a bit confused. you picked up a th400 yoke and it didnt fit? as far as I know there was two styles, either a slipyoke or a fixed u-joint on the back of the trans. I am not aware of two styles of th400 slipyokes __________________

12-13-2010, 01:15 PM	#5
C-Rat Registered User Join Date: Dec 2009 Location: Fort Lauderdale FL Posts: 9	Re: TH400 Slip Yoke See, thats what I thought too...I'm so frustrated! I'm ready to just put the 350 trans in(I have the yoke for that!)

12-13-2010, 01:20 PM	#6
Allensracing Registered User Join Date: Dec 2010 Location: Paradise, ca Posts: 295	Re: TH400 Slip Yoke post a picture of the back of the trans? __________________

12-13-2010, 01:27 PM	#7
C-Rat Registered User Join Date: Dec 2009 Location: Fort Lauderdale FL Posts: 9	Re: TH400 Slip Yoke

12-13-2010, 01:28 PM	#8
Allensracing Registered User Join Date: Dec 2010 Location: Paradise, ca Posts: 295	Re: TH400 Slip Yoke ok, i would say your right. looks like a regular 400 to me. did the guy selling you a yoke screw up? __________________

12-13-2010, 01:30 PM	#9
C-Rat Registered User Join Date: Dec 2009 Location: Fort Lauderdale FL Posts: 9	Re: TH400 Slip Yoke Thats what I'm thinking...big company down here in Florida though. Going to try another shop and hope somebody there knows what i need. Thank you!

12-13-2010, 02:05 PM	#11
stich626 Account Suspended Join Date: Sep 2010 Location: hingham ma Posts: 1,721	Re: TH400 Slip Yoke pick up a new seal too. that ones ripped at 9 oclock

12-13-2010, 02:16 PM	#12
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	Re: TH400 Slip Yoke I have a couple turbo 400 yokes out there for sale, if you need one. Thanks Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

02-02-2012, 12:56 AM	#13
Lances69 Registered User Join Date: Jan 2011 Location: Colcord, OK Posts: 19	Re: TH400 Slip Yoke Hey guys, i think i might have a solution to the problem, see, i have a 69 longbed that came with a 350/400 combo and a 12 bolt rear end, and the 2 peice driveshaft, my carrier bearing went out and mees up all my u joints, when i was replacing them my slip yoke broke! So we ordered another off the internet thst fitmy ujoints(1310 series) and when i got it i went to install it and it didnt fit, i removed the seal and tried it then and i noticed that it bottoned out on the 4" tailhousing, i went back to my? Roken yoke and measured the ground hub(barrel) diameter with a digital caliper and then measured the new one and i noticed my old one came in at 1.688" and the new one came in at 1.885" hub diameter,. With a bit of reasearch i noticed that this combination was not widely used and not used for very long. Now im thinking about taking the new yoke to the machine shop to shave off .20" or returning it and spending more to get the right one. __________________ 69 chevy lwb, SBC 355, edelbrock carb w/ spacer on stock qjet manifold, accel HEI ignition, headers, THM400 tranny, 3.08 gears,Daily Project

02-02-2012, 12:57 AM	#14
Lances69 Registered User Join Date: Jan 2011 Location: Colcord, OK Posts: 19	Re: TH400 Slip Yoke Hey guys, i think i might have a solution to the problem, see, i have a 69 longbed that came with a 350/400 combo and a 12 bolt rear end, and the 2 peice driveshaft, my carrier bearing went out and mees up all my u joints, when i was replacing them my slip yoke broke! So we ordered another off the internet thst fitmy ujoints(1310 series) and when i got it i went to install it and it didnt fit, i removed the seal and tried it then and i noticed that it bottoned out on the 4" tailhousing, i went back to my broken yoke and measured the ground hub(barrel) diameter with a digital caliper and then measured the new one and i noticed my old one came in at 1.688" and the new one came in at 1.885" hub diameter,. With a bit of reasearch i noticed that this combination was not widely used and not used for very long. Now im thinking about taking the new yoke to the machine shop to shave off .20" or returning it and spending more to get the right one. __________________ 69 chevy lwb, SBC 355, edelbrock carb w/ spacer on stock qjet manifold, accel HEI ignition, headers, THM400 tranny, 3.08 gears,Daily Project

02-02-2012, 12:49 PM	#15
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: TH400 Slip Yoke Just an FYI.. 68-70 truck T400's used a smaller outside diameter yoke so they had to use a thicker tailshaft bushing. You are on the right track by having your current one shaved down to fit. Or find an early "truck specific" yoke.

02-02-2012, 10:24 PM	#16
mmmBoost Registered User Join Date: Jan 2011 Location: Wisconsin Posts: 224	Re: TH400 Slip Yoke There is also 3 different length tailshaft housings for the TH400 over its entire build period __________________ Always remember those that had your back Never forget those that turned it Demon 68- C20 (conv. 5 lug) 406sb, TH400, 12 Bolt, Red Slut 09- 1500 Crew Cab Z71, 2.5" Lift, Comp Cam, Deleted AFM/DoD, Diablo tuner



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02-03-2012, 12:25 AM	#17
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: TH400 Slip Yoke The splines are the only thing that are the same. You can run either thickness yolk, you just have to get the correct seal. __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!

02-03-2012, 12:37 AM	#18
Lances69 Registered User Join Date: Jan 2011 Location: Colcord, OK Posts: 19	Re: TH400 Slip Yoke Actually no becuase my extension housing holds the small shaft the big shaft bottomed out on the housing where the small shaft went inside the bushing in there, and the bigger seal will not fit in the housing either becuase i got one and it didnt fit, __________________ 69 chevy lwb, SBC 355, edelbrock carb w/ spacer on stock qjet manifold, accel HEI ignition, headers, THM400 tranny, 3.08 gears,Daily Project

02-03-2012, 12:54 AM	#19
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: TH400 Slip Yoke Okay then I'm not sure what you are talking about. I've never had these issues and TH400s are the only auto I have ever ran. Another day where I have learned something. The TH400 that is in my Camaro came out of a 68 longhorn with a BBC and TH400. I just got a car yolk and it slide right in. hmmm.... __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!

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