Transmission? for a 68 chevy truck... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MidniteChevy68 · 01-29-2006, 11:00 PM

Recently I have noticed that my transmission is going out on me and planning on buying one through Summit, but I have a question about something before I order it so I don't get myself in the position to have to return it. Currently, I have a stock turbo 350 trans and just wanted to know what it is the length of the tailshaft so I can order the correct size tranny, because I want to avoid having custom work done to fit it. Thanks!

pharcydekm · 01-29-2006, 11:15 PM

measure the tailshaft of the tranny. It will either be a 6" or 9" tailshaft.

MidniteChevy68 · 01-29-2006, 11:37 PM

To tell you the truth I don't know where to begin and end the measuring for the tailshaft because I am not too familiar with transmission. What is the common lenght of tailshafts for the 68 chevy, or any ideas on how to measure it. Thanks!

larry may · 01-29-2006, 11:44 PM

Measure from the seal where the drive shaft inserts into the trani. From there measure to where the tail shaft housing bolts to the transmission housing. Will either be 9" lomg or 6" short.

MidniteChevy68 · 01-30-2006, 12:01 AM

thanks guys for all your help I'll go give a try and measure it.

MidniteChevy68 · 01-30-2006, 12:15 AM

I actually have one more questions how can you tell the difference between a turbo 400 between a turbo 350 tranny. Thanks!

da-burb · 01-30-2006, 12:21 AM

get out your US map. TH400's pan looks like the state of Illinois. TH350's are pretty much square with one corner clipped.

As far as the TH350 tail lengths are concerned. Chevy produce 3 lenghts. Standard on trucks are the short 6". The other lengths are 9" and 12".

Longhorn Man · 01-30-2006, 12:26 AM

Your truck shouldn't have a Th350... not if it is original... or original-ish. The TH350 wasn't untill 69. As original, your ride would have either the TH400, or the Powerglide 2 speed.

Quick way to ID a 350 from a 400 is to look for the kick down. if there is an electric switch on your carb that is activated when you get close to WOT, then it's a 400, if there is a cable kickdown hooked to the throttle, then you have a 350.

MidniteChevy68 · 01-30-2006, 12:33 AM

man I am learning a bunch of new stuff today. Thanks guys!

edmonton72 · 01-30-2006, 01:57 AM

What I would do is get an overdrive tranny like a 700r4 or even a 6L80E.

**VetteVet** · 01-30-2006, 02:41 AM

here's your dimensions

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

farside847 · 01-30-2006, 11:55 AM

Hey, good link!

Anyone know the length of a stock 3speed manual? I thought it was the same as the Turbo350 but I might be wrong....

409biscayne · 01-30-2006, 12:46 PM

Quote:

Originally Posted by Longhorn Man

Your truck shouldn't have a Th350... not if it is original... or original-ish. The TH350 wasn't untill 69. As original, your ride would have either the TH400, or the Powerglide 2 speed.

Quick way to ID a 350 from a 400 is to look for the kick down. if there is an electric switch on your carb that is activated when you get close to WOT, then it's a 400, if there is a cable kickdown hooked to the throttle, then you have a 350.

Transmission related question : How long do you think the "long" tailshaft is ? I was at the wrecker the other day and they were telling me the t400 in a station wagon has a long tailshaft . Might make a good tranny to use when converting to a one piece driveshaft .

01-29-2006, 11:00 PM	#1
MidniteChevy68 Registered User Join Date: Feb 2003 Location: Sacramento, CA Posts: 53	Transmission? for a 68 chevy truck... Recently I have noticed that my transmission is going out on me and planning on buying one through Summit, but I have a question about something before I order it so I don't get myself in the position to have to return it. Currently, I have a stock turbo 350 trans and just wanted to know what it is the length of the tailshaft so I can order the correct size tranny, because I want to avoid having custom work done to fit it. Thanks! __________________ 68' Chevy truck longbed: flows, 4/6 drop, k&n filter, GMC front clip, and 20s

01-29-2006, 11:15 PM	#2
pharcydekm Registered User Join Date: May 2003 Location: Englewood, CO Posts: 146	Re: Transmission? for a 68 chevy truck... measure the tailshaft of the tranny. It will either be a 6" or 9" tailshaft.

01-29-2006, 11:37 PM	#3
MidniteChevy68 Registered User Join Date: Feb 2003 Location: Sacramento, CA Posts: 53	Re: Transmission? for a 68 chevy truck... To tell you the truth I don't know where to begin and end the measuring for the tailshaft because I am not too familiar with transmission. What is the common lenght of tailshafts for the 68 chevy, or any ideas on how to measure it. Thanks! __________________ 68' Chevy truck longbed: flows, 4/6 drop, k&n filter, GMC front clip, and 20s

01-29-2006, 11:44 PM	#4
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: Transmission? for a 68 chevy truck... Measure from the seal where the drive shaft inserts into the trani. From there measure to where the tail shaft housing bolts to the transmission housing. Will either be 9" lomg or 6" short.

01-30-2006, 12:01 AM	#5
MidniteChevy68 Registered User Join Date: Feb 2003 Location: Sacramento, CA Posts: 53	Re: Transmission? for a 68 chevy truck... thanks guys for all your help I'll go give a try and measure it. __________________ 68' Chevy truck longbed: flows, 4/6 drop, k&n filter, GMC front clip, and 20s

01-30-2006, 12:15 AM	#6
MidniteChevy68 Registered User Join Date: Feb 2003 Location: Sacramento, CA Posts: 53	Re: Transmission? for a 68 chevy truck... I actually have one more questions how can you tell the difference between a turbo 400 between a turbo 350 tranny. Thanks! __________________ 68' Chevy truck longbed: flows, 4/6 drop, k&n filter, GMC front clip, and 20s

01-30-2006, 12:21 AM	#7
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Re: Transmission? for a 68 chevy truck... get out your US map. TH400's pan looks like the state of Illinois. TH350's are pretty much square with one corner clipped. As far as the TH350 tail lengths are concerned. Chevy produce 3 lenghts. Standard on trucks are the short 6". The other lengths are 9" and 12". __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

01-30-2006, 12:26 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Transmission? for a 68 chevy truck... Your truck shouldn't have a Th350... not if it is original... or original-ish. The TH350 wasn't untill 69. As original, your ride would have either the TH400, or the Powerglide 2 speed. Quick way to ID a 350 from a 400 is to look for the kick down. if there is an electric switch on your carb that is activated when you get close to WOT, then it's a 400, if there is a cable kickdown hooked to the throttle, then you have a 350.

01-30-2006, 12:33 AM	#9
MidniteChevy68 Registered User Join Date: Feb 2003 Location: Sacramento, CA Posts: 53	Re: Transmission? for a 68 chevy truck... man I am learning a bunch of new stuff today. Thanks guys! __________________ 68' Chevy truck longbed: flows, 4/6 drop, k&n filter, GMC front clip, and 20s

01-30-2006, 01:57 AM	#10
edmonton72 Nothings as cool as my 72 Join Date: May 2005 Location: Edmonton, AB, Kanuckastan Posts: 181	Re: Transmission? for a 68 chevy truck... What I would do is get an overdrive tranny like a 700r4 or even a 6L80E. __________________ 1972 C10 Longbox In the middle of body off restoration Rebuilt 355, turbo 400, 3.42 12-bolt Rolling chassis finally done and cab mounted. Now onto sanding, bondo and more sanding.

01-30-2006, 02:41 AM	#11
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: Transmission? for a 68 chevy truck... here's your dimensions http://www.tciauto.com/tech_info/trans_dims.htm __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-30-2006, 11:55 AM	#12
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Re: Transmission? for a 68 chevy truck... Hey, good link! Anyone know the length of a stock 3speed manual? I thought it was the same as the Turbo350 but I might be wrong.... __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree



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